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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
Proteins perform many physiological functions. For example some functions as enzymes. One of the following represents an additional function that some proteins discharge ………(a) Antibiotics (b) Pigment conferring colour to skin (c) Pigments making colours of flowers (d) Hormones |
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Answer» (d) Hormones |
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| 602. |
Distinguish between nitrogenous base and a base found in inorganic chemistry. |
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Answer» Nitrogenous Base: 1. Nitrogenous bases are organic molecules containing the element nitrogen & acts as a base in chemical reaction. 2. e.g. Adenine, Thymine Base: 1. Bases are the substance that release hydroxide (OH- ) ions in aqueous solution. 2. e.g. NaOH and Ca(OH)2 |
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| 603. |
Polymer which has amide linkage isA. Nylon-66B. TeryleneC. TeflonD. Bakelite |
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Answer» Correct Answer - A Nylon `-66` has amide linkage. |
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| 604. |
Which of the following compounds contain amide linkage?A. Nylon-6B. AcetamideC. ProteinsD. Cellulose |
| Answer» Correct Answer - A::B::C | |
| 605. |
Name the vitamin whose deficiency causes (i) Night blindness (ii) Poor coagulation of blood. |
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Answer» (i) Deficiency of vitamin A causes night blindness. (ii) Deficiency of vitamin K causes poor coagulation of blood. |
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| 606. |
(i) Deficicency of which vitamin causes night-blindness ? (ii) Name the base that is found in nuvleotide of RNA only. (iii) Glucose on reaction with HI gives n-hexane. What does it suggest about the strcuture of glucose ? |
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Answer» (i) Deficiency of vitamin A causes night blindness. (ii) Uracil is present in nucleotide of RNA only. (iii) This shows that six carbon atoms in glucose are linked by straight chains. |
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| 607. |
Classify the following into monosaccharides and disaccharides. i) ribose ii) 2-deoxy ribose iii) maltose iv) fructose. |
| Answer» `{:("(i)Ribose" , "-Monosaccharide"),("(ii) 2-deoxy ribose" , "-Monosaccharide"),("(iii) Maltose:" , "-Disaccharide"),("(iv)Fructose" , "-Monosaccharide"):}` | |
| 608. |
Classify the following into monosaccharides and disaccharides: Ribose, `2-`deoxyribose, maltose,galactose, fructose,and lactose. |
| Answer» Monosaccharides: ribose, `2-`deoxyribose, galactose, and fructose, Disaccharides: maltose and lactose. | |
| 609. |
What are biofuels? |
| Answer» The conpounds that generate energy in living cells on metabolism are called biofuels. Examples: Carbohydrates and fats. | |
| 610. |
What do you understand by the term glycosidic linkage? |
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Answer» Correct Answer - The oxide linkage two monosaccharides, formed by loss of a water molecule is called glycosidic linkage. The oxide linkage two monosaccharides, formed by loss of a water molecule is called glycosidic linkage. |
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| 611. |
Classify the following into monosaccharides and disaccharides.Ribose, 2-deoxyribose, maltose, galactose, fructose and lactose. |
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Answer» Monosaccharides: Ribose, 2-deoxyribose, fructose. |
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| 612. |
Lactose is made ofA. `alpha-D-`glucose onlyB. `alpha-D-`glucose and `beta-D-`glucoseC. `alpha-D-` glucose and `beta-D-` glucoseD. `beta-D-` galactose and `alpha-D-` glucose |
| Answer» Correct Answer - D | |
| 613. |
(i) Which vitamin deficiency causes rickets ? (ii) Name the base that is found in the nucleotide of RNA only. (iii) Glucose on reaction with acetic acid gives glucose pentaacetate. What does it suggest about the structure of glucose ? |
| Answer» (i) Vitamin D (ii) Uracil (iii) Glucose molecule has five -OH groups in its structural formula. | |
| 614. |
What is the basic structural difference between starch and cellulose? |
| Answer» Starch consists of amylose and amylopectin. Amylose is a linear polymer of `alpha-D-`glucose, `C-1` of one glucose unit is connected to `C-4` of the other through `alpha`-glycosidic linkage. However, in cellulose, `C-1` of one glucose unit is connected to `C-4` of the other through `beta-`glycosidic linkage (see Section 17.320). Amylopectin, on the other hand, has a highly branched structure. | |
| 615. |
Which of the following is correct for carbohydrates? (a) They act as biofuels (b) They are reserve food materials (c ) They are constitunents of biomolecues, (d) They act as the chief structural materialA. a,b,cB. b,c,dC. a,b,dD. a,b,c,d |
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Answer» Correct Answer - D Oxidation of glucose to `CO_(2)` and `H_(2)O` by enzymes provides energy for the functioning of the cell `A` part of chemical energy obtained by oxidation of biomolecules is stored in the cells in the form of `ATP` (ribose is an essential eomponent of `ATP`) which carries out all the cellular functions. |
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| 616. |
Name two carbohydrates which can act as Biofuels. |
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Answer» Starch and glycogen. |
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| 617. |
Write two sources of vitamin A. |
| Answer» Two sources of vitamin A are : Milk and Fish. | |
| 618. |
Name two carbohydrates which act as bio-fuels. |
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Answer» Two carbohydrates which act as biofuels are starch and glycogen. |
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| 619. |
What is the difference between `alpha`-glucose and `beta`-glucose ? Write their cyclic structures. |
| Answer» Both `alpha-D` glucose and `beta-D` glucose are anomers and they differ in their configuration about `C_(1)` atom. | |
| 620. |
What is glycogen? How is it different from starch? |
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Answer» Glycogen like starch is a condensation polymer of α - D glucose. Just as glucose is stored in plants in the form of starch it is stored in the form glycogen in human beings. It is present in liver, muscles and brain. When body needs glucose, enzymes breakdown glycogen to provide glucose. It is also present in yeast and fungi. The main difference between glycogen and starch is that starch is made up of amylose and amylopectin where as glycogen consists of a structure almost same as amylopectin with large number of branching, (amylose has a linear structure and amylopectin has a branched structure with branching after every 25-30 molecules). Glycogen has branching after every 10-15 molecules. |
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| 621. |
Name two carbohydrates which act as bio-fuels. |
| Answer» These are starch and glucose. | |
| 622. |
What are the hydrolysis products of (i) sucrose and (ii) lactose? |
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Answer» Both sucrose and lactose are disaccharides sucrose on hydrolysis gives one molecule of α - D glucose and one molecule of β - D - fructose but lactose on hydrolysis gives one molecule of β - D glucose and one molecule of β - D galactose. |
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| 623. |
What is the difference in the structures of `alpha-D(+)` glucose and `beta-D(+)` glucose ? |
| Answer» These are anomers and differ in the configuration of H atom and OH group about `C_(1)` atom. | |
| 624. |
What happens when D-glucose is treated with (a) HI in the presence of red phosphorus (b) Conc. `HNO_(3)` ? |
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Answer» (a) n-hexane is formed as a result of reduction. (b) Saccharic acid is formed as a result of oxidation. |
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| 625. |
What are the hydrolysis products of sucrose ? |
| Answer» The products of hydrolysis of surcose are glucose and fructose. | |
| 626. |
What are the hydrolysis products of `(i)` sucrose and `(ii)` lactose? |
| Answer» Starch upon hydrolysis gives `alpha-D(+)` glucose which is the constituent of both amylose and amylopection. Lactose upon hydrolysis gives galactose and glucose. | |
| 627. |
What are the hydrolysis products o i) sucrose and ii) lactose ? |
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Answer» The hydrolysis products of sucrose are glucose and fructose. `underset("sucrose")(C_12H_22+H_2O) to underset("glucose")(C_6H_12O_6) + underset("fructose")(C_6H_12O_6)` ii) The hydrolysis products of lactose are galactose and glucose. `underset("lactose")(C_12H_22O_11) + H_2O to underset("glucose") (C_6H_12O_6)+underset("galactose")(C_6H_12O_6)` |
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| 628. |
Which of the following is used to obtain `alpha`-form of glucose?A. It is obtained by the crystallisation from concentrated solution of glucose at 317 KB. It is obtained by the crystallisation from concentrated solution of glucose at 303 KC. It is obtained by the crystallisation from hot saturated aqueous solution at 303 KD. It is obtained by the crystallisation from hot and saturated aqueous solution at 371 K |
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Answer» Correct Answer - B It is obtained by the crystallisation from concentrated solution of glucose at 303 K. |
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| 629. |
What are the hydrolysis products of sucrose ?A. one molecule of glucoseB. two molecule of glucoseC. one molecule of glucose and fructoseD. one molecule of glucose and maltose |
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Answer» Correct Answer - C Sucrose on hydrolysis gives one molecule each of glucose and fructose. Maltose give two molecules of glucose only. |
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| 630. |
Which is correct sequence according to increasing molecular weight ?A. tRNA- DNA- rRNAB. tRNA - rRNA - DNAC. rRNA- DNA- tRNAD. DNA- tRNA - rRNA |
| Answer» Correct Answer - B | |
| 631. |
Which of the following statements is correct about fructose?A. It is dextrorotatory compoundB. It exists in the two cyclic forms which is obtained by the addition of OH at C-5 to the gt C =O groupC. It exists as six membered ringD. It is named as furanose as it contain one oxygen and six carbon atom |
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Answer» Correct Answer - B It exists in two cyclic forms which are obtained by the addition of-OH at C-5 to the C =Ogroup |
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| 632. |
An essential amino acid is one thatA. must be included in the dietB. occurs in all types of proteinC. contains no sulphurD. the body synthesis |
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Answer» Correct Answer - A |
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| 633. |
Two of the following amino are needed for growth only and are not essential for adults.A. Cysteine and cystineB. Lecucine and ValineC. Tryptophan and isolecucineD. Arginine and histidine |
| Answer» Correct Answer - D | |
| 634. |
Which of the following polysaccharide is stored in the cell wall?A. CelluloseB. AmylaseC. AmylopectinD. Glycogen |
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Answer» Correct Answer - A Cellulose is a predominant constituent of cell wall in the plant cells. |
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| 635. |
What is Denaturation of proteins? What is its effect? |
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Answer» When a native protein is subjected to change in pH, temperature or chemicals, the tertiary structure of protein gets unfolded, the protein gets denatured. This causes the protein to change biological activity. eg boiled egg, curdling of milk |
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| 636. |
Give the differences b/w nucleotide & nucleoside. |
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Answer» Nucleotide - Nitrogen base, pentose sugar & phosphate Nucleoside -Nitrogen base, pentose sugar |
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| 637. |
The area of DNA rich in A - T base pairs is calledA. high melting areaB. low melting areaC. microsatelliteD. pallindrome |
| Answer» Correct Answer - B | |
| 638. |
The simplest amino acid isA. alanineB. valineC. tyrosineD. glycine |
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Answer» Correct Answer - D |
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| 639. |
The ultimate product of the hydrolysis of starch isA. only glucoseB. glucose and fructose in equimolar amountsC. galactose and fructose in equimolar amountsD. glucose and galactose in equimolar amounts |
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Answer» Correct Answer - A On complete hydrolysis of starch, glucose is formed. Amylase is an enzyme that catalyses the hydrolysis of starch into sugars. |
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| 640. |
On hydrolysis of starch by dilute acids we get finallyA. glucose and fructoseB. glucoseC. fructoseD. sucrose |
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Answer» Correct Answer - B |
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| 641. |
Which of the following is the simplest amino acidA. AlanineB. AsparagineC. GlyycineD. Tyrosine |
| Answer» Correct Answer - C | |
| 642. |
Which of the following is the simplest amino acidA. AlanineB. AsparagineC. GlycineD. Tyrosine |
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Answer» Correct Answer - C Proteins are polymers of amino acids in which amino acids are joined by peptide bonds. Glycine is the simplest amino acid. |
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| 643. |
Purines have nitrogen atoms at _____ positions.A. 1, 2, 4 and 6 positionB. 1, 3, 5 and 7 positionC. 1, 3, 7 and 9 positionD. 1, 2, 6 and 8 position |
| Answer» Correct Answer - C | |
| 644. |
Write purines & pyrimidine bases present in DNA & RNA. |
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Answer» DNA----A,G,C,T RNA---A,G,C,U |
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| 645. |
In purines, N is at position _____in its two rinigs.A. 1,3,7,9B. 1,5C. 7,9D. 1&9 |
| Answer» Correct Answer - A | |
| 646. |
Why starch turns blue black with iodine? |
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Answer» Appearance of blue colour with the addition of iodine is due to its reaction with amylose fraction of starch. |
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| 647. |
Starch undergoes hyrolysis in the presence of a dilute mineral acid to give the ultimate productA. D-fructoseB. L-glucoseC. D-glucoseD. L-fructose |
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Answer» Correct Answer - C Starch and cellulose are two ubiquitous plant polysaccharides consisting of only D- glucose units. Upon treatment with acid or under the influence of enzymes, starch as well as cellulose are hydrolyzed finally to `D - (+) -` glucose. Cellulose differs from starch in having `beta- 1 , 4-` glucosidic linkages and not `alpha`. The chains are mainly linear with little branching. Cellulose has more glucose unit giving it a higher molecular mass. |
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| 648. |
Which of the following is the simplest amino acidA. glycineB. alanineC. valineD. leucine |
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Answer» Correct Answer - A Every amino acid except glycine contains at least one chiral center . As obtained by acidic except glycine has been found optically active `H_(2) - N underset("Glycine")(CH_(2)) - CO_(2) H` Alanine `[H_(2) NCH (CH_(3)) CO_(2) H]` is the samllest chiral `alpha`-amino acid. |
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| 649. |
Purines of RNA areA. guanine & adenineB. uracil & thymineC. adenine & cytosineD. uracil & guanine |
| Answer» Correct Answer - A | |
| 650. |
Why do starch give blue black colour with iodine ? |
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Answer» Starch forms helical secondary structures which can hold I2. |
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