138 + Interview Questions in Biomolecules in Chemistry – Class 12 Page 1 InterviewSolution

1.	The enzyme which catalyses the conversion of proteins to amino acids is ______(a) invertase(b) urease(c) nuclease(d) proteaseI have been asked this question during an internship interview.I need to ask this question from Biomolecules topic in portion Biomolecules of Chemistry – Class 12
Answer» Correct option is (d) protease Best explanation: PROTEASES are enzymes that HELPS in protein catabolism by HYDROLYSIS of peptide BONDS. Pepsin and trypsin are the most common proteases, found in the human stomach and pancreas respectively. Both of them are major digestive enzymes.

Discussion

2.	Which of the following bases contain two keto groups?(a) Adenine(b) Guanine(c) Thymine(d) CytosineI had been asked this question in an interview.This intriguing question comes from Biomolecules in portion Biomolecules of Chemistry – Class 12
Answer» RIGHT CHOICE is (C) Thymine Best explanation: Bases are nitrogen containing heterocyclic compounds present in nucleic ACIDS. Adenine has no keto group, guanine and cytosine have one keto group each, and thymine and uracil have two keto groups in their rings.

Discussion

3.	Which of the following statement is incorrect?(a) Vitamin deficiency causes diseases(b) Excess vitamin intake is harmful(c) Vitamins contain amino groups(d) Vitamins can be produced by plantsThis question was posed to me during an online exam.My question is from Biomolecules topic in division Biomolecules of Chemistry – Class 12
Answer» Correct answer is (c) VITAMINS contain amino groups To EXPLAIN: PLANTS can synthesize almost all vitamins, and are considered essential FOOD factors. Both deficiency and excess of vitamins affect the health of an individual negatively. Vitamins were earlier identified as compounds containing amino groups, but was later DISCOVERED that most of them did not contain amino groups.

Discussion

4.	Which of the following amino acids contains only one amino group?(a) Leucine(b) Lysine(c) Asparagine(d) GlutamineThis question was addressed to me in exam.I want to ask this question from Biomolecules topic in division Biomolecules of Chemistry – Class 12
Answer» The CORRECT OPTION is (a) Leucine Explanation: Lysine, ASPARAGINE and glutamine all contain TWO amino (NH2) groups, of which one is a part of the side chain. Leucine has a purely ALKYL side chain and the only amino group it has is one the α-carbon.

Discussion

5.	When the OH group at anomeric carbon lies on the same side as that of the OH group on C3 carbon, it is known as ______(a) α-glucose(b) β-glucose(c) D-glucose(d) (+)-glucoseI had been asked this question in final exam.My doubt is from Biomolecules Carbohydrates in portion Biomolecules of Chemistry – Class 12
Answer» Correct option is (B) β-glucose To elaborate: The OH at C3 carbon ALWAYS lies on the side OPPOSITE to that of OH at C2 and C4 carbon in all structures of glucose. When the OH of anomeric carbon lies on the same side as that of the C2 and C4 carbon Oh GROUP, it is known as α-form. Else, it is β-form.

Discussion

6.	When the α-form of glucose is dissolved in water and allowed to rest, what will be the percentage of β-form in this solution after some time?(a) 0(b) 36(c) 64(d) 100I had been asked this question by my school teacher while I was bunking the class.I want to ask this question from Biomolecules Carbohydrates in chapter Biomolecules of Chemistry – Class 12
Answer» Correct choice is (c) 64 Explanation: When either α or β FORMS of glucose are dissolved in water and are allowed to stand, an EQUILIBRIUM MIXTURE of both forms is formed (36% α-form and 64% β-form). This is due to a spontaneous change in SPECIFIC rotation of an optically active COMPOUND with time to an equilibrium value. This phenomenon is called as mutarotation.

Discussion

7.	Which of the following disaccharides does not consist of two glucose units?(a) Trehalose(b) Cellobiose(c) Isomaltose(d) LactuloseThis question was posed to me in an internship interview.This intriguing question comes from Biomolecules Carbohydrates in portion Biomolecules of Chemistry – Class 12
Answer» The correct answer is (d) Lactulose To elaborate: Lactulose is a disaccharide which is composed of two DIFFERENT MONOSACCHARIDE UNITS namely, galactose and fructose. Whereas trehalose, CELLOBIOSE and isomaltose are disaccharides CONSISTING of two glucose units.

Discussion

8.	Raffinose is an example of a ________(a) monosaccharide(b) disaccharide(c) trisaccharide(d) tetrasaccharideThe question was asked in an international level competition.Question is taken from Biomolecules Carbohydrates in division Biomolecules of Chemistry – Class 12
Answer» Correct answer is (C) TRISACCHARIDE The best I can explain: Raffinose (C18H32O16) is an oligosaccharide which on HYDROLYSIS gives THREE different monosaccharides, galactose, glucose and fructose. Hence, it is a trisaccharide.

Discussion

9.	Identify from the following pairs, a pair of aldoses.(a) Sorbose, allose(b) Mannose, tagatose(c) Psicose, gulose(d) Talose, idoseThe question was posed to me in an interview for job.This interesting question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12
Answer» CORRECT option is (d) TALOSE, IDOSE Explanation: All the compounds mentioned are monosaccharides with the formula C6H12O6. However, allose, mannose, GULOSE, talose and idose are aldohexoses. Sorbose, tagatose and PSICOSE are aldoketoses.

Discussion

10.	All monosaccharides are reducing sugars.(a) True(b) FalseI got this question during a job interview.Question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12
Answer» CORRECT answer is (a) True The explanation: All monosaccharides whether aldose or ketose, are REDUCING sugars. This is because they have an ALDEHYDE group or can tautomerize in solution to FORM an aldehyde group, which reduces FEHLING’s solution and Tollen’s reagent.

Discussion

11.	Estradiol is the main sex hormone in females.(a) True(b) FalseThis question was posed to me in an interview.This interesting question is from Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» Right CHOICE is (a) True Explanation: Estradiol is a STEROID hormone which is majorly responsible for the DEVELOPMENT of SECONDARY sex characteristics in females and participates in the control of menstrual cycle.

Discussion

12.	Lack of which component in diet causes hypothyroidism?(a) Potassium(b) Vitamin C(c) Iodine(d) WaterI have been asked this question in an interview.Question is from Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» Correct choice is (c) IODINE Explanation: Low levels of iodine in the diet may LEAD to hypothyroidism and enlargement of the THYROID gland. This can be controlled by adding sodium iodide to table salt to FORM IODISED salt.

Discussion

13.	The condition goitre is associated with which hormone?(a) Insulin(b) Thyroxine(c) Adrenaline(d) CortisoneThe question was asked in my homework.I want to ask this question from Biomolecules topic in division Biomolecules of Chemistry – Class 12
Answer» CORRECT option is (b) Thyroxine The best explanation: Thyroxine is an iodinated derivative of TYROSINE. Abnormally low levels of thyroxine LEADS to hypothyroidism, which CAUSES enlargement of thyroid gland (goitre). Increases level of thyroxine causes hyperthyroidism.

Discussion

14.	Which form of glucose is obtained by crystallization from hot and saturated aqueous solution at 371K?(a) D-form(b) L-form(c) α-form(d) β-formI had been asked this question in an internship interview.I want to ask this question from Biomolecules Carbohydrates topic in section Biomolecules of Chemistry – Class 12
Answer» The correct choice is (d) β-form The explanation is: When a saturated aqueous solution is heated to about 100°C and then crystallized, the β-form of glucose is obtained. On the other hand, a CONCENTRATED solution at ROOM temperature on CRYSTALLIZATION gives α-form.

Discussion

15.	Identify the complementary strand of the DNA primary structure ATGCCGATC.(a) AUGCCGAUC(b) TACGGCTAG(c) UACGGCUAG(d) GATCGGCATThis question was posed to me in an online interview.My question comes from Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» Correct answer is (b) TACGGCTAG Explanation: DNA does not contain uracil. SINCE ADENINE (A) pairs only with THYMINE (T) and cytosine (C) pairs with guanine (G), COMPLEMENTARY strand will be TACGGCTAG.

Discussion

16.	Glucose on Fehling’s test gives ______(a) no reaction(b) silver mirror(c) red precipitate(d) pungent gasThe question was posed to me during an interview.I want to ask this question from Biomolecules Carbohydrates topic in section Biomolecules of Chemistry – Class 12
Answer» The correct option is (c) red PRECIPITATE Easy EXPLANATION: Since glucose is readily oxidised, it acts as a strong reducing agent and reduces Fehling’s reagent to form a carboxylate compound (in the place of CHO group which gets oxidised) ALONG with a red precipitate of Cu2O.

Discussion

17.	Erythrulose is a/an _______(a) aldotetrose(b) aldoheptose(c) ketotetrose(d) ketoheptoseThis question was posed to me in an international level competition.I'm obligated to ask this question of Biomolecules Carbohydrates topic in chapter Biomolecules of Chemistry – Class 12
Answer» Correct choice is (C) ketotetrose To explain I would say: Erythrulose is a tetrose CARBOHYDRATE (because it contains 4 carbon atoms) with the FORMULA C4H8O4. It has one ketone group and HENCE BELONGS to the ketose family.

Discussion

18.	Which of the following monosaccharides is a ketohexose?(a) Glucose(b) Galactose(c) Fructose(d) MannoseThis question was posed to me during an online exam.My query is from Biomolecules Carbohydrates in division Biomolecules of Chemistry – Class 12
Answer» Right ANSWER is (c) Fructose The EXPLANATION: Fructose is a monosaccharide that consists of six carbon ATOMS including a carbonyl carbon of a keto group within its chain. Glucose, GALACTOSE and MANNOSE are examples of aldohexoses.

Discussion

19.	Which of the following best describes cytosine?(a) pyrimidine, present in RNA and DNA(b) pyrimidine, present only in DNA(c) purine, present only in RNA(d) purine, present in RNA and DNAI had been asked this question in unit test.Question is taken from Biomolecules in section Biomolecules of Chemistry – Class 12
Answer» CORRECT answer is (a) pyrimidine, present in RNA and DNA Explanation: Bases (NITROGEN containing heterocyclic compounds) are of TWO types. Those that have a single ring are PURINES, and those that have two fused rings are PYRIMIDINES. Adenine, guanine and cytosine are present in both RNA and DNA.

Discussion

20.	Nucleotides are linked together by bonds between 5’ and 2’ carbons of two different pentose sugars.(a) True(b) FalseThe question was asked by my school teacher while I was bunking the class.This interesting question is from Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» Correct OPTION is (b) False Best explanation: Nucleotides are JOINED TOGETHER by phosphodiester linkage between the 5’ and 3’ carbon atoms of the pentose sugars.

Discussion

21.	Cyanocobalamin is used for the treatment of deficiency of which vitamin?(a) B2(b) B12(c) E(d) KThis question was posed to me during an online interview.I want to ask this question from Biomolecules topic in chapter Biomolecules of Chemistry – Class 12
Answer» Right CHOICE is (b) B12 The BEST I can explain: Cyanocobalamin is the manufactured form of vitamin B12 which is used to treat B12 deficiency, which CAUSES pernicious anaemia. It is OBTAINED from PRODUCTS like fish, meat, eggs, cheese and curd.

Discussion

22.	How many peptide linkages does a hexapeptide have?(a) 4(b) 5(c) 6(d) 7This question was posed to me in my homework.The origin of the question is Biomolecules in section Biomolecules of Chemistry – Class 12
Answer» The correct choice is (b) 5 To explain I would say: A hexapeptide is a COMPOUND formed by the combination of six same or different amino acids with the help of the amino and carboxyl GROUPS. The six amino acids are connected by FIVE peptide BONDS.

Discussion

23.	Amino acids behave like carboxylic acids(a) True(b) FalseI have been asked this question in homework.My enquiry is from Biomolecules in chapter Biomolecules of Chemistry – Class 12
Answer» The correct choice is (b) False Best EXPLANATION: Generally, amino ACIDS BEHAVE like salts rather than simple amines or carboxylic acids. This is due to the presence of both acidic (COOH) and basic (NH2) groups in the same molecule.

Discussion

24.	Starch : Plants : : X : Animals. Identify X.(a) Starch(b) Glucose(c) Cellulose(d) GlycogenI got this question during an internship interview.I need to ask this question from Biomolecules Carbohydrates in portion Biomolecules of Chemistry – Class 12
Answer» Correct choice is (d) GLYCOGEN Explanation: Starch is the MAIN storage polysaccharide of plants. On the other hand, CARBOHYDRATES are stored in animals in the form of glycogen. It is also known as ANIMAL starch because of its similar structure to amylopectin.

Discussion

25.	Vitamin B2 is also known as _______(a) thiamine(b) riboflavin(c) cobalamin(d) pyridoxineI got this question at a job interview.This is a very interesting question from Biomolecules topic in chapter Biomolecules of Chemistry – Class 12
Answer» Correct ANSWER is (b) riboflavin The explanation is: Vitamin B2 is a water-soluble vitamin with the chemical name riboflavin. Its deficiency causes cheilosis, digestive DISORDERS and burning sensation of the SKIN.

Discussion

26.	The structure shown is that of a _______(a) DNA nucleoside(b) RNA nucleoside(c) DNA nucleotide(d) RNA nucleotideThis question was addressed to me in homework.This interesting question is from Biomolecules topic in section Biomolecules of Chemistry – Class 12
Answer» The correct option is (B) RNA nucleoside Explanation: A unit formed by the LINKING of a base to C1 CARBON of a pentose sugar is called a nucleoside. The sugar shown is β-D-ribose and the base is uracil, hence it has to belong to RNA.

Discussion

27.	Enzymes are regarded as ______(a) biocatalysts(b) messengers(c) inhibitors(d) antibodiesThe question was posed to me in an international level competition.This intriguing question comes from Biomolecules in chapter Biomolecules of Chemistry – Class 12
Answer» Right option is (a) biocatalysts For explanation I WOULD SAY: Enzymes are biological catalysts PRODUCED by living cells which catalyse the biochemical reactions in living organisms. Chemically, enzymes are naturally occurring simple or CONJUGATE proteins.

Discussion

28.	The primary structure of protein is unaffected by denaturation.(a) True(b) FalseI had been asked this question in an internship interview.I'm obligated to ask this question of Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» Right answer is (a) True To explain I would say: Denaturation is the process of altering the physical and biological PROPERTIES of proteins WITHOUT affecting CHEMICAL composition. It is caused by subjecting the protein to physical changes like temperature, pH, etc. During this, the secondary and TERTIARY structures are destroyed but the primary STRUCTURE remains intact.

Discussion

29.	If the basic formula of an α-amino acid is R-CH(NH2)-COOH, where R is the side chain, what is the primary point of distinction between any two proteins?(a) Number of amino groups(b) Number of carboxyl groups(c) The side chain R(d) Relative positions of amino, carboxyl groups and RI had been asked this question in final exam.My doubt stems from Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» Correct option is (c) The SIDE chain R The best explanation: α-amino ACIDS are the constituents of proteins. Different proteins are formed by polymerisation of different α-amino acids, which are formed due to the difference in the side chain substituted group R, which MAY be as simple as hydrogen or as COMPLEX as imidazole.

Discussion

30.	Which of the following is incorrect regarding tryptophan?(a) It is an essential amino acid(b) It is a basic amino acid(c) It has an aromatic side chain(d) It is a non-polar amino acidI have been asked this question in exam.The origin of the question is Biomolecules topic in chapter Biomolecules of Chemistry – Class 12
Answer» Correct ANSWER is (b) It is a BASIC amino ACID The best I can explain: TRYPTOPHAN is an essential amino acid with bicyclic aromatic side chain, indole. It cannot be synthesized by the human body and must be taken for nitrogen balance in the body. It has one amino and carboxyl GROUP each and is a neutral amino acid.

Discussion

31.	Which of the following statements is incorrect with respect to starch?(a) It is a reducing carbohydrate(b) It is a polymer of α-D-glucose(c) It gives blue colour with iodine(d) It consists of branched chainsThe question was posed to me during a job interview.Asked question is from Biomolecules Carbohydrates topic in chapter Biomolecules of Chemistry – Class 12
Answer» Right choice is (a) It is a REDUCING carbohydrate For explanation I would SAY: Starch is a non-reducing saccharide as it does not REDUCE Fehling’s SOLUTION or Tollen’s reagent. This indicates that all hemiacetal hydroxyl groups of glucose units are not free nut are linked by glycosidic bonds.

Discussion

32.	What is the correct name of the following compound?(a) D-(+)-fructose(b) D-(-)-fructose(c) L-(+)-fructose(d) L-(-)-fructoseThe question was asked during an interview.This interesting question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12
Answer» Right answer is (b) D-(-)-fructose The best I can explain: SINCE the OH GROUP on the carbon ADJACENT to the last CH2OH group is on the right-hand SIDE, it is of D configuration. Also, fructose is naturally a laevorotatory compound, HENCE the (-) sign.

Discussion

33.	Glucose can exist in both a straight chain and ring form.(a) True(b) FalseThis question was posed to me during a job interview.The above asked question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12
Answer» Right CHOICE is (a) True To explain I would say: This is due to the OBSERVATIONS where GLUCOSE in most cases behaves as an aldehyde and in some cases does not. This LED to speculation of the existence of glucose in other forms where the CHO group was not present. The RING form of glucose was subsequently discovered.

Discussion

34.	The α-D-glucose and β-D-glucose isomers of glucose are known as _______(a) enantiomers(b) stereoisomers(c) anomers(d) glycomersI had been asked this question in final exam.The question is from Biomolecules Carbohydrates in chapter Biomolecules of Chemistry – Class 12
Answer» Right ANSWER is (c) ANOMERS Explanation: In the cyclic STRUCTURE of glucose, the pair of optical isomers that differ in the configuration only AROUND the C1 CARBON (anomeric carbon) are called anomers.

Discussion

35.	Which of the following is incorrect regarding maltose?(a) It consists of two glucopyranose units(b) It is a non-reducing sugar(c) Glycosidic bond between C1 of one unit and C4 of the other unit(d) It is a disaccharideThis question was posed to me in final exam.I'm obligated to ask this question of Biomolecules Carbohydrates in division Biomolecules of Chemistry – Class 12
Answer» Correct choice is (b) It is a non-reducing sugar Easy EXPLANATION: The FREE aldehyde group can be produced at the C1 carbon of the second α-D-glucose unit in SOLUTION and it shows reducing properties. Hence, it is a reducing sugar.

Discussion

36.	Deficiency of vitamin K increases the blood clotting time.(a) True(b) FalseI had been asked this question in a national level competition.My question is based upon Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» Right choice is (a) True The explanation is: Vitamin K (PHYLLOQUINONE) is fat-soluble and also KNOWN as coagulation vitamin. It helps in clotting of BLOOD and prevents haemorrhage.

Discussion

37.	Which of the following is soluble in water?(a) Insulin(b) Elastin(c) Fibroin(d) CollagenThe question was asked in an interview for internship.Enquiry is from Biomolecules in chapter Biomolecules of Chemistry – Class 12
Answer» CORRECT option is (a) INSULIN Explanation: Fibroin (silk), collagen (TENDONS) and elastin (skin) are fibrous PROTEINS which are insoluble in WATER. Insulin is an example of a globular protein which is water soluble.

Discussion

38.	Identify the amino acid with the formula HOOC-CH2-CH2-CH(NH2)-COOH.(a) Glutamic acid(b) Aspartic acid(c) Glutamine(d) AsparagineThis question was posed to me in semester exam.I would like to ask this question from Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» The correct option is (a) GLUTAMIC acid For explanation: Glutamic acid is an amino substituted dicarboxylic acid which can be synthesized by the BODY. Its IUPAC name is 2-aminopentanedioic acid. Since it has two COOH groups (one more than the number of NH2 groups), it is ACIDIC in NATURE.

Discussion

39.	Which of the following amino acids is optically inactive?(a) Glycine(b) Alanine(c) Lysine(d) ValineThis question was addressed to me in quiz.This intriguing question comes from Biomolecules topic in section Biomolecules of Chemistry – Class 12
Answer» Right option is (a) Glycine Best explanation: Glycine is the only naturally OCCURRING α-amino acid that is OPTICALLY inactive. This is because the α-carbon of glycine has two hydrogen ATOMS attached to it.

Discussion

40.	Identify the compound from its structure as derived from that given by Fischer.(a) Glucose(b) Gluconic acid(c) Saccharic acid(d) SorbitolThis question was addressed to me in unit test.This interesting question is from Biomolecules Carbohydrates topic in chapter Biomolecules of Chemistry – Class 12
Answer» Correct OPTION is (C) Saccharic ACID The best I can EXPLAIN: Gluconic acid (as shown) is obtained when D-glucose is treated with bromine water, RESULTING in the oxidation of the aldehyde group to a carboxyl group. Gluconic acid on further oxidation gives saccharic acid.

Discussion

41.	Cellulose is a _______ saccharide.(a) reducing(b) branched chain(c) β-glucose straight chain(d) oligoI had been asked this question during an interview.My doubt stems from Biomolecules Carbohydrates topic in portion Biomolecules of Chemistry – Class 12
Answer» Right option is (c) β-GLUCOSE straight chain Easy explanation: Cellulose is a straight chain polysaccharide composed of only β-D-glucose UNITS which are joined by glycosidic links between C1 of ONE glucose unit and C4 of the next glucose unit.

Discussion

42.	Amylum is one of the components of starch.(a) True(b) FalseThe question was asked in an interview for internship.My doubt stems from Biomolecules Carbohydrates topic in chapter Biomolecules of Chemistry – Class 12
Answer» Correct ANSWER is (b) False The best EXPLANATION: Starch is a polymer of α-glucose consisting of two components namely, AMYLOSE and amylopectin. Amylum is just another common NAME for starch.

Discussion

43.	Identify the product of the following reaction.(a) Gluconic acid(b) Glutaric acid(c) Glutamic acid(d) Glucaric acidThe question was posed to me in a national level competition.My query is from Biomolecules Carbohydrates in section Biomolecules of Chemistry – Class 12
Answer» CORRECT choice is (d) Glucaric acid Easiest EXPLANATION: Strong oxidising agents like nitric acid OXIDISE both the terminal groups of glucose to give a dicarboxylic acid, saccharic acid, also known as glucaric acid. This reaction also INDICATES the presence of a primary alcoholic group. Gluconic acid also UNDERGOES a similar reaction.

Discussion

44.	Sucrose consists of which of the following monosaccharide units?(a) Fructose, galactose(b) Fructose, glucose(c) Galactose, glucose(d) Glucose, glucoseThe question was asked in an interview.This is a very interesting question from Biomolecules Carbohydrates topic in section Biomolecules of Chemistry – Class 12
Answer» Correct ANSWER is (b) Fructose, glucose Easy explanation: Sucrose is a disaccharide, ALSO known as common sugar, composed of TWO different MONOSACCHARIDE units, glucose and fructose, which are obtained on hydrolysis.

Discussion

45.	The reaction of glucose with NH2OH gives _______(a) n-hexane(b) glucose oxime(c) glucose cyanohydrin(d) a gluconic acidI had been asked this question in class test.My question comes from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12
Answer» CORRECT choice is (b) glucose oxime To explain I WOULD say: Glucose reacts with hydroxylamine to form an oxime of glucose, where a carbon-nitrogen DOUBLE bond is formed (C=N-OH) in place of the CHO GROUP. This reaction establishes the presence of a carbonyl group in glucose.

Discussion

46.	Identify the hormone that increases the glucose level in blood.(a) Insulin(b) Glucagon(c) Oxytocin(d) VasopressinThis question was posed to me in final exam.The above asked question is from Biomolecules topic in portion Biomolecules of Chemistry – Class 12
Answer» Right option is (b) Glucagon For EXPLANATION: Insulin is released in response to the rapid rise in blood glucose level. On the other hand, the HORMONE glucagon tends to increase the glucose level in blood. These TWO HORMONES together regulate the blood glucose level.

Discussion

47.	Which of the following statements is correct?(a) Adenine is a pyrimidine(b) DNA is made of amino acids(c) Nucleosides do not contain phosphorous(d) RNA contains thymineI had been asked this question in a job interview.This intriguing question originated from Biomolecules topic in division Biomolecules of Chemistry – Class 12
Answer» The correct option is (c) Nucleosides do not contain phosphorous For EXPLANATION: Adenine is a substituted purine as it has two fused rings. DNA is MADE up of NUCLEOTIDES. RNA does not contain thymine, instead it has uracil. Nucleosides have a BASE attached to a pentose sugar. Since both the sugar and base do not contain phosphorous, nucleosides do not have it. On the other hand, nucleotides contain phosphorous in the form of phosphoric ACID.

Discussion

48.	Cysteine is a/an ________ amino acid.(a) acidic(b) essential(c) aromatic(d) sulphur containingI got this question in a national level competition.The query is from Biomolecules in section Biomolecules of Chemistry – Class 12
Answer» Correct ANSWER is (d) sulphur containing The best EXPLANATION: CYSTEINE is a semi-essential, neutral amino acid. Its SIDE chain is HS-CH2 (thiol), which is aliphatic and contains sulphur. Its SYMBOL is Cys and its code is C.

Discussion

49.	Which of the following water-soluble vitamins are stored in the body?(a) B2(b) B4(c) B12(d) CThe question was asked in class test.This question is from Biomolecules in division Biomolecules of Chemistry – Class 12
Answer» The correct choice is (c) B12 To explain: All B GROUP vitamins and vitamin C are WATER SOLUBLE. However, vitamin B12 is not excreted in urine and is INSTEAD stored in the body. It is involved in the metabolism of every cell in the body.

Discussion

50.	Which of the following best describes a particular enzyme?(a) Chemical catalyst(b) Fibrous protein(c) Highly selective(d) Can be used for various reactionsI got this question in final exam.Enquiry is from Biomolecules in portion Biomolecules of Chemistry – Class 12
Answer» The correct answer is (c) Highly selective Explanation: Enzymes are biological CATALYSTS produced by LIVING cells. They differ from other catalysts in being highly selective and SPECIFIC. Almost all enzymes are globular PROTEINS. They are very specific for a PARTICULAR reaction and a particular substrate.

Discussion

Explore topic-wise InterviewSolutions in .

The enzyme which catalyses the conversion of proteins to amino acids is ______(a) invertase(b) urease(c) nuclease(d) proteaseI have been asked this question during an internship interview.I need to ask this question from Biomolecules topic in portion Biomolecules of Chemistry – Class 12

Which of the following bases contain two keto groups?(a) Adenine(b) Guanine(c) Thymine(d) CytosineI had been asked this question in an interview.This intriguing question comes from Biomolecules in portion Biomolecules of Chemistry – Class 12

Which of the following amino acids contains only one amino group?(a) Leucine(b) Lysine(c) Asparagine(d) GlutamineThis question was addressed to me in exam.I want to ask this question from Biomolecules topic in division Biomolecules of Chemistry – Class 12

Which of the following disaccharides does not consist of two glucose units?(a) Trehalose(b) Cellobiose(c) Isomaltose(d) LactuloseThis question was posed to me in an internship interview.This intriguing question comes from Biomolecules Carbohydrates in portion Biomolecules of Chemistry – Class 12

Raffinose is an example of a ________(a) monosaccharide(b) disaccharide(c) trisaccharide(d) tetrasaccharideThe question was asked in an international level competition.Question is taken from Biomolecules Carbohydrates in division Biomolecules of Chemistry – Class 12

Identify from the following pairs, a pair of aldoses.(a) Sorbose, allose(b) Mannose, tagatose(c) Psicose, gulose(d) Talose, idoseThe question was posed to me in an interview for job.This interesting question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12

All monosaccharides are reducing sugars.(a) True(b) FalseI got this question during a job interview.Question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12

Estradiol is the main sex hormone in females.(a) True(b) FalseThis question was posed to me in an interview.This interesting question is from Biomolecules in division Biomolecules of Chemistry – Class 12

Lack of which component in diet causes hypothyroidism?(a) Potassium(b) Vitamin C(c) Iodine(d) WaterI have been asked this question in an interview.Question is from Biomolecules in division Biomolecules of Chemistry – Class 12

The condition goitre is associated with which hormone?(a) Insulin(b) Thyroxine(c) Adrenaline(d) CortisoneThe question was asked in my homework.I want to ask this question from Biomolecules topic in division Biomolecules of Chemistry – Class 12

Identify the complementary strand of the DNA primary structure ATGCCGATC.(a) AUGCCGAUC(b) TACGGCTAG(c) UACGGCUAG(d) GATCGGCATThis question was posed to me in an online interview.My question comes from Biomolecules in division Biomolecules of Chemistry – Class 12

Glucose on Fehling’s test gives ______(a) no reaction(b) silver mirror(c) red precipitate(d) pungent gasThe question was posed to me during an interview.I want to ask this question from Biomolecules Carbohydrates topic in section Biomolecules of Chemistry – Class 12

Erythrulose is a/an _______(a) aldotetrose(b) aldoheptose(c) ketotetrose(d) ketoheptoseThis question was posed to me in an international level competition.I'm obligated to ask this question of Biomolecules Carbohydrates topic in chapter Biomolecules of Chemistry – Class 12

Which of the following monosaccharides is a ketohexose?(a) Glucose(b) Galactose(c) Fructose(d) MannoseThis question was posed to me during an online exam.My query is from Biomolecules Carbohydrates in division Biomolecules of Chemistry – Class 12

Nucleotides are linked together by bonds between 5’ and 2’ carbons of two different pentose sugars.(a) True(b) FalseThe question was asked by my school teacher while I was bunking the class.This interesting question is from Biomolecules in division Biomolecules of Chemistry – Class 12

Cyanocobalamin is used for the treatment of deficiency of which vitamin?(a) B2(b) B12(c) E(d) KThis question was posed to me during an online interview.I want to ask this question from Biomolecules topic in chapter Biomolecules of Chemistry – Class 12

How many peptide linkages does a hexapeptide have?(a) 4(b) 5(c) 6(d) 7This question was posed to me in my homework.The origin of the question is Biomolecules in section Biomolecules of Chemistry – Class 12

Amino acids behave like carboxylic acids(a) True(b) FalseI have been asked this question in homework.My enquiry is from Biomolecules in chapter Biomolecules of Chemistry – Class 12

Starch : Plants : : X : Animals. Identify X.(a) Starch(b) Glucose(c) Cellulose(d) GlycogenI got this question during an internship interview.I need to ask this question from Biomolecules Carbohydrates in portion Biomolecules of Chemistry – Class 12

Vitamin B2 is also known as _______(a) thiamine(b) riboflavin(c) cobalamin(d) pyridoxineI got this question at a job interview.This is a very interesting question from Biomolecules topic in chapter Biomolecules of Chemistry – Class 12

The structure shown is that of a _______(a) DNA nucleoside(b) RNA nucleoside(c) DNA nucleotide(d) RNA nucleotideThis question was addressed to me in homework.This interesting question is from Biomolecules topic in section Biomolecules of Chemistry – Class 12

Enzymes are regarded as ______(a) biocatalysts(b) messengers(c) inhibitors(d) antibodiesThe question was posed to me in an international level competition.This intriguing question comes from Biomolecules in chapter Biomolecules of Chemistry – Class 12

The primary structure of protein is unaffected by denaturation.(a) True(b) FalseI had been asked this question in an internship interview.I'm obligated to ask this question of Biomolecules in division Biomolecules of Chemistry – Class 12

What is the correct name of the following compound?(a) D-(+)-fructose(b) D-(-)-fructose(c) L-(+)-fructose(d) L-(-)-fructoseThe question was asked during an interview.This interesting question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12

Glucose can exist in both a straight chain and ring form.(a) True(b) FalseThis question was posed to me during a job interview.The above asked question is from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12

The α-D-glucose and β-D-glucose isomers of glucose are known as _______(a) enantiomers(b) stereoisomers(c) anomers(d) glycomersI had been asked this question in final exam.The question is from Biomolecules Carbohydrates in chapter Biomolecules of Chemistry – Class 12

Deficiency of vitamin K increases the blood clotting time.(a) True(b) FalseI had been asked this question in a national level competition.My question is based upon Biomolecules in division Biomolecules of Chemistry – Class 12

Which of the following is soluble in water?(a) Insulin(b) Elastin(c) Fibroin(d) CollagenThe question was asked in an interview for internship.Enquiry is from Biomolecules in chapter Biomolecules of Chemistry – Class 12

Identify the amino acid with the formula HOOC-CH2-CH2-CH(NH2)-COOH.(a) Glutamic acid(b) Aspartic acid(c) Glutamine(d) AsparagineThis question was posed to me in semester exam.I would like to ask this question from Biomolecules in division Biomolecules of Chemistry – Class 12

Which of the following amino acids is optically inactive?(a) Glycine(b) Alanine(c) Lysine(d) ValineThis question was addressed to me in quiz.This intriguing question comes from Biomolecules topic in section Biomolecules of Chemistry – Class 12

Cellulose is a _______ saccharide.(a) reducing(b) branched chain(c) β-glucose straight chain(d) oligoI had been asked this question during an interview.My doubt stems from Biomolecules Carbohydrates topic in portion Biomolecules of Chemistry – Class 12

Amylum is one of the components of starch.(a) True(b) FalseThe question was asked in an interview for internship.My doubt stems from Biomolecules Carbohydrates topic in chapter Biomolecules of Chemistry – Class 12

Identify the product of the following reaction.(a) Gluconic acid(b) Glutaric acid(c) Glutamic acid(d) Glucaric acidThe question was posed to me in a national level competition.My query is from Biomolecules Carbohydrates in section Biomolecules of Chemistry – Class 12

The reaction of glucose with NH2OH gives _______(a) n-hexane(b) glucose oxime(c) glucose cyanohydrin(d) a gluconic acidI had been asked this question in class test.My question comes from Biomolecules Carbohydrates topic in division Biomolecules of Chemistry – Class 12

Identify the hormone that increases the glucose level in blood.(a) Insulin(b) Glucagon(c) Oxytocin(d) VasopressinThis question was posed to me in final exam.The above asked question is from Biomolecules topic in portion Biomolecules of Chemistry – Class 12

Cysteine is a/an ________ amino acid.(a) acidic(b) essential(c) aromatic(d) sulphur containingI got this question in a national level competition.The query is from Biomolecules in section Biomolecules of Chemistry – Class 12

Which of the following water-soluble vitamins are stored in the body?(a) B2(b) B4(c) B12(d) CThe question was asked in class test.This question is from Biomolecules in division Biomolecules of Chemistry – Class 12

Which of the following best describes a particular enzyme?(a) Chemical catalyst(b) Fibrous protein(c) Highly selective(d) Can be used for various reactionsI got this question in final exam.Enquiry is from Biomolecules in portion Biomolecules of Chemistry – Class 12