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551.

Which of the following carbohydrate (s) would not undergo mutarotation in aqueous solution ? A. II onlyB. I, III and IV only (c)C. II and IV onlyD. I and III only

Answer» Correct Answer - C
552.

The phenomenon of mutarotation is shown by:A. glucoseB. fructoseC. CelluloseD. starch

Answer» Correct Answer - A::B
553.

Which of the vitamins given below is water soluble ?A. Vitamin CB. Vitamin DC. Vitamin ED. Vitamin K

Answer» Correct Answer - A
554.

Assertion (A) D-glucose when dissolved in water undergo mutarotation while sucrose solution does not show mutarotation Reason (R) D-glucose exist in two cyclic anomeric forms.

Answer» Correct Answer - B
555.

Thiol group is present inA. cystineB. cysteineC. methionineD. cytosine

Answer» Correct Answer - B
556.

The correct functional group `X` and the reagent//reaction conditions `Y` in the following scheme are .A. `X = COOCH_(3),Y=H_(2)//Ni//"heat"`B. `X=CONH_(2),Y=H_(2)//Ni//"heat"`C. `X=CONH_(2),Y=Br_(2)//NaOH`D. `X=CN,Y=H_(2)//Ni//"heat"`

Answer» Correct Answer - A::B::C::D
557.

The correct functional group `X` and the reagent//reaction conditions `Y` in the following scheme are .A. `X=COOCH_(3)," " Y=H_(2)//Ni//heat`B. `X = CONH_(2)," " Y = H_(2)//ni//heat`C. `X = CONH_(2)," " Y = Br_(2)//NaOH`D. `X = Cn, " "Y = H_(2)//Ni//heat`

Answer» Correct Answer - a,b,c,d
558.

Write the number of given reagents which can be used to differentiate the pair of following compounds in OMR sheet. (a) 2-gexyne and 3 hexyne (b) 2-pentanol and 3-pentanol (c ) 4-methyl aniline and N-methyl aniline (d) Phenol and cyclo hexanol `(1) ZnHg//HCl" "(2) ZnCl_(2)//HCl``(3) aq.AgNO_(3)" "(4)NaOI` `(5) NaNH_(2),/_" "(6) elc.AgNO_(3)` `(7) N_(2)H_(4)//H_(2)O_(2)" " (8) CHCl_(3)//KOH,/_` [Hint : If differentiation of (a) can be done by reagent 1, (b) by 2, (c ) by 3 and (d) by 4, then write 1234 in OMR sheet.]

Answer» Correct Answer - 5482
559.

The pair of compounds in which both the compounds give positive test Tollens reagent is :A. glucose and sucroseB. fructose and sucroseC. acetophenone and hexanalD. glucose and fructose

Answer» Correct Answer - d
560.

Select the given code of reagents for following canversion and write your answer as abcd. If reagent is used once then you need not to take again. (1) `H_(2)So_(4)` (2) `ZnHg//HCl` (3) `NHO_(3)//NH_(3)So_(4)` (4)`NaNO_(2)//HCl0^(@)-5^(@)C` (5) `NaH_(4)//H_(2)O_(2)` (6) NBS (7) `Me-overset(O)overset(||)C-Cl//AlCl_(3)` (8) `Me_(3)CO^(Θ)Na^(o+)`

Answer» Correct Answer - 7268
561.

to get quick enregy , one should use ?A. CarbohydrateB. FatsC. VitaminsD. Proteins

Answer» Correct Answer - A
562.

`p-` chloroaniline and anilinium hydrogen chloride can be distinguished byA. Sandmeryer reactionB. `NaHCO_(3)`C. `AgNO_(3)`D. Carbylamine test

Answer» Correct Answer - b.c
563.

The pOH range for the isoelectric point of the amphoteric ion of an amino acid isA. 5.5 to 6.3B. 2.5 to 5.0C. 7.7 to 8.5D. 9.0 to 10.7

Answer» Correct Answer - C
The pH at which a particular amino acid does not migrate under the influence of an electric field is called isoelectric point of that amino acid. The pH range for the isoelectric point is from 5.5 to 6.3 or the pOH range for the isoelectric point is from 7.7 to 8.5.
564.

Which one of the following reagent is used to convert fructose into sorbitol and mannitol? (a) LiAlH4 (b) Hl / Red P (c) Na / Hg (d) Conc. HNO3

Answer»

Na / Hg is used to convert fructose into sorbitol and mannitol.

565.

Fructose on oxidation with concentrated nitric acid gives(a) glyceric acid + oxalic acid(b) glycoffic acid + tartaric acid (c) tartronic acid + mesoxalic acid (d) acetic acid + hexanoic acid

Answer»

(b) glycoffic acid + tartaric acid

566.

How many asymmetric carbon atoms are present in fructose? (a) 4 (b) 3 (c) 2 (d) 6

Answer»

asymmetric carbon atoms are present in fructose.

567.

Which amino acid has no asymmetric carbon?A. HistidineB. ThreonineC. `alpha`-alanineD. Glycine

Answer» Correct Answer - D
Glycine is `underset(NH_(2))underset(|)(CH_(2))COOH`, having no asymmetric carbocation.
568.

The most important contribution to the stability of a protein conformation appears to be theA. entropy increase from the decrease in ordered water molecules forming a solvent shell around itB. maximum entropy increase from ionic interactions between the ionized amino acids in a proteinC. sum of free energies of formation of many weak interactions between its polar amino acids and surrounding water moleculesD. sum of free energies the hundreds of amino acids in a protein

Answer» Correct Answer - D
Several weak electrostatic attractin exist between the amino acid units of protein. These interactions lower the free energy to a very great extent.
569.

Vitamin `A` is called:A. ascorbic acidB. lactic acidC. citric acidD. paracetamol

Answer» Correct Answer - A
Vitamin `C` is ascorbic acid.
570.

Which base is present in `RNA` but not in `DNA`?A. CytosinB. GuanineC. UracilD. Adenine

Answer» Correct Answer - C
The bases present in `DNA` are: Adenine, Guenine, Cytosine and Thymine.
571.

Which of the following is not a fat soluble vitamin?A. Vitamin `A`B. Vitamin `K`C. Folic acidD. Vitamin `E`

Answer» Correct Answer - C
Folic aci (vitamin V-complex) and vitamin `C` are water soluble vitamin.
572.

`DNA` multiplication is called:A. translationB. transductionC. replicationD. transcrption

Answer» Correct Answer - C
The genetic information of the cell is contained in the sequance of the base, `A T,G` and `C` in `DNA` molecule. When a cell divides `DNA` molecules replicate and make exact copies of themselves so that each daughter cell will have `DNA` identical to that of the parent cell.
573.

Which of the following statements is not true?A. Pheromones are secreted outside the body by the insectsB. Aspirin in analgesis and antipyreticC. Sucrose is a dipeptide commonly known as aspartanmeD. The `DNA` assists in the synthesis of `RNA` molecules

Answer» Correct Answer - C
Sucrose is a disaccharide and it is commonly known as tabel sugar not aspartane.
574.

Which of the following is/are true? (a) Sucrose is a non reducing sugar (b) Glucose is oxidised by bromine water (c) Glucose rotates plane polarized light in clock-wise direction (d) Fructose is oxidised by bromine water. Select the correct answer using the codes given below:A. (a),(b),(c)B. (a),(b) onlyC. (b),(c) onlyD. (a),(d) only

Answer» Correct Answer - A
See glucose and sucrose.
575.

The segment of `DNA` which acts as the instrumental manual for the synthesis of the protein is:A. riboseB. geneC. nucleosideD. nucleotide

Answer» Correct Answer - B
Genes are responsible for protein synthesis.
576.

Assertion `:` Certain narcotics are used as analgesics. Reason`:` Narcotics lower the body temperature in high fever.A. If both the assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.

Answer» Correct Answer - C
Assertion is correct but reason is false, because narcotics cannot lowers the body temperature in high fever.
577.

From chemical consideration, the digestion is basicallyA. hydrolysisB. anabolismC. hydrogenationD. degradation

Answer» Correct Answer - A
From chemical consideration, digestion is basically hydrolysis.
578.

Which one of the following biomolecules is insoluble in waterA. `alpha`-keratinB. haemoglobinC. ribonucleaseD. adenine

Answer» Correct Answer - A
Fibrous proteins (keratin, fibroin etc) are usually insoluble in water.
579.

Which one of the following biomolecules is insoluble in waterA. `alpha-`keratinB. haemoglobinC. ribonucleaseD. adenine

Answer» Correct Answer - A
`alpha-` Keratin is a water insoluble fibrous protein that serves as the major consituent of hair, nails and skin.
580.

Which one of the following biomolecules is insoluble in waterA. `alpha`-keralinB. haemoglobinC. ribonucleaseD. adenine

Answer» Correct Answer - A
581.

Which one of the following is a peptide hormone ?A. ProgesteroneB. ThyroxineC. OxypurinD. Insulin

Answer» Correct Answer - B
Thyroxine is an iodine-containing amino acid hormone produced by the thyroid gland.
Progestines are pregnancy hormones. An example of a progestin is progestone, resposibile for preparing the uterus for implantation of the fertilized egg. Many steroid hormones including progesterone itself, have played important role as birth control agents.
Insulin, a peptide hormone, has a perfomed inluence on carbohydrates metabolism. It facilitates entry of glucose and other sugars into the cells by increasing penetration of cell membranes and augmenting in blood and therefore insulin is commonly known as hypoglycemic factor.
582.

Which of the following statements is true for protein synthesis (translation)?A. amino acids are directly recognised by mRNaB. the third base of the carbon is less specificC. only one condon codes for an amino acidsD. every t-Rna has more than one amino acids attachement.

Answer» Correct Answer - B
583.

Each question has choices (a), (b), (c ) and (d) out of which ONLY ONR is correct. STATEMENT -1 : Solubility of an amino acid is maximu at isoelectric point. STATEMENT - 2 : At isoelectric point amino acods exists as zwitter ion.A. Statement -1 is True, Statement-2 is True ,Statement -2 is a correct explanation for Statement -1.B. Statement -1 is True, Statement-2 is True ,Statement -2 is a NOT correct explanation for Statement -1.C. Statement -1 id True , Statement -2 is False.D. Statement -1 is False Statement -2 is True.

Answer» Correct Answer - d
584.

The human body does not produce `:`A. EnzymesB. DNAC. VitaminsD. Hormones

Answer» Correct Answer - C
Certain organic compounds are required in small amounts in our diet their deficiency causes specific diseases. These compounds are called vitamins. Most of the vitamins cannot be synthesised in our body but plants can synthesize almost all of them, so they considered as essential food factors, however, the bacteria of the gut can produce some of the vitamins required by us. All the vitamins are generally available in our diet.
585.

Which one of the following is a peptide hormone ?A. AdrenalineB. GlucagonC. TestosteroneD. Thyroxin

Answer» Correct Answer - B
Glucagon is a peptide hormone as its structure is charactersied by the presence of peptide linkage.
586.

The human body does not produce `:`A. enzymesB. DNAC. VitaminsD. hormonse

Answer» Correct Answer - C
587.

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes A and B, involved in the process proteins `overset"Enzyme (A)"to ` polypeptides `overset"Enzyme (B)"to` amino acids, respectively areA. amylase and maltaseB. diastase and lipaseC. pepsin and trypsinD. invertase and zymase

Answer» Correct Answer - C
In the process of digestion , the proteins present in food material are hydrolysed to amino acid . In this process, two enzymes pepsin and trypsin are involved as follows
Protein `underset"(Enzyme A)"overset"Pepsin"to` Polypeptide `underset"(Enzyme B)"overset"Trypsin"to` Amino acid
588.

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process are: `overset("Enzyme (A)")(rarr)` Polypeptides `underset("Enzyme (B)")(rarr)`Amino acidsA. invertase and zymaseB. amylase and maltaseC. diastase and lipaseD. pepsin and trypsin

Answer» Correct Answer - D
Proteins `underset("proteases")overset("pepsin")to ` Polypeptides `underset("chemotrypsin")overset("trypsin")to ` Amino acids.
589.

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process are: `overset("Enzyme (A)")(rarr)` Polypeptides `underset("Enzyme (B)")(rarr)`Amino acidsA. invertase and zymaseB. amylase and maltaseC. distase and lipaseD. pepsin and trypsin

Answer» Correct Answer - D
590.

Which functional group participates in the disulphide bond formation in proteins?A. ThiolactoneB. ThiolC. ThioetherD. Thioester

Answer» Correct Answer - B
Disulphide bond may be reduced to thiol by means of reagents, ie. `NaBH_(4)` which shows the presence of thiol group in disulphide bond formation.
591.

Which of the following proteins destroy the antigen when it enters in body cell ?A. AntibodiesB. InsulinC. chromoproteinsD. phosphoproteins

Answer» Correct Answer - A
Antibodies are the proteins which protect the body against toxic substances and infections. When an antigen enter in the body cells, the antibodies present in the body destroyed the antigen.
592.

Which of the following structures represents the peptide chain?A. `-overset(H)overset(|)(N)-underset(O)underset(||)(C)-underset(H)underset(|)(N)-overset(|)underset(|)(C)-NH-overset(O)overset(||)(C)-NH-`B. `-overset(H)overset(|)(N)-underset(O)underset(||)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-`C. `-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-`D. `-overset(|)underset(|)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-underset(H)underset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(H)overset(|)(N)-underset(O)underset(||)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-`

Answer» Correct Answer - C
The peptide linkage (-NH-CO-) is formed by the condensation of amino acids molecules
`HNHunderset(R)underset(|)(C)H-underset(O)underset(||)(C)OH+H.N H underset(R)underset(|)(C)H-underset(O)underset(||)(C)OH to -HN underset(R)underset(|)(C)H-underset(O)underset(||)(C)-NH underset(R)underset(|)(C)H-underset(O)underset(||)(C)-`
Hence, following structure represents the peptide chain
`-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-`
593.

Which one of the following structure represents the peptide chain :A. B. C. D.

Answer» Correct Answer - b
594.

the conversion of maltose to glucose is possible by the enzyme :A. zymaseB. lactaseC. maltoseD. diastase.

Answer» Correct Answer - C
Maltose `underset(H^(+))overset("Maltase")to ` Glucose + Glucose
595.

the conversion of maltose to glucose is possible by the enzyme :A. zymaseB. lactoseC. maltaseD. distase

Answer» Correct Answer - C
See enzymes
596.

In DNA, the complementary bases are :A. Adenine and adenine, cytosine and cytosineB. Uracil and adenine, cytosine and guanineC. Adenine and thymine, guanine and cytosineD. Adenine and thymine, guanine and uracil

Answer» Correct Answer - C
597.

Which of the following represents a peptide chain ?A. `-overset(H)overset(|)(N)-underset(O)underset(||)(C )-underset(H)underset(|)(N)-overset(|)underset(|)(C )-NH-underset(O)underset(||)(C )-NH-`B. `-overset(H)overset(|)(N)-underset(O)underset(||)(C )-overset(|)underset(|)(C )-overset(|)underset(|)(C )-overset(|)underset(|)(C )-overset(H)overset(|)(N)-overset(|)underset(|)(C )-overset(|)underset(|)(C )-overset(|)underset(|)(C )-`C. `-overset(H)overset(|)(N)-overset(|)underset(|)(C )-underset(O)underset(||)(C )-overset(H)overset(|)(N)-overset(|)underset(|)(C )-underset(O)underset(||)(C )-overset(H)overset(|)(N)-overset(|)underset(|)(C )-overset(O)overset(||)(C )-`D. `-overset(H)overset(|)(N)-overset(|)underset(|)(C )-overset(|)underset(|)(C )-underset(O)underset(||)(C )-underset(H)underset(|)(N)-overset(|)underset(|)(C )-overset(|)underset(|)(C )-underset(H)underset(|)(N)-underset(O)underset(||)(C )-overset(|)underset(|)(C )-overset(|)underset(|)(C )-`

Answer» Correct Answer - C
598.

The conversion of maltose into glucose is possible through the enzymeA. zymaseB. lactaseC. maltaseD. diastase

Answer» Correct Answer - C
599.

Distinguish between Macronutrients & Micronutrients.

Answer»

Macronutrients: 

  • Nutrients required in larger quantities for plant growth are called Macronutrients.
  • g. Potassium and Calcium

Micronutrients:

  • Nutrients required in trace amount for plant growth are called Micronutrients 
  • e.g. Zinc and Bora
600.

Distinguish between Primary metabolite & Secondary metabolite.

Answer»

Between Primary metabolite & Secondary metabolite:

Primary metabolites are those that are required for the basic metabolic processes like photosynthesis, respiration, etc 

Example: Lipase, a protein.

Secondary metabolites does not show any direct function in growth and development of organisms. 

Example: Ricin, gums.