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NEET • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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Showing 61-90 of 191 questions

61 Medium

61 of 191

Understanding +4 | -1

Glucose on reduction with Na/Hg and water gives:

View answer and explanation

Correct option: A

Sorbitol

Option A (Sorbitol) is correct because the reduction of glucose with Na/Hg and water converts the aldehyde group to a hydroxyl group, resulting in sorbitol, a sugar alcohol.

62 Easy

62 of 191

Remembering +4 | -1

Fat on hydrolysisgives which alcohol?

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Correct option: A

Glycerol

Option A (Glycerol) is correct because fats are triglycerides, which upon hydrolysis yield glycerol and fatty acids.

63 Easy

63 of 191

Analyzing +4 | -1

Which of the following does not contain

{C}={O}

bond?

View answer and explanation

Correct option: A

Adenine

The correct answer is A (Adenine) because Adenine is a purine base and does not contain a carbonyl (C=O) group in its structure.

64 Easy

64 of 191

Remembering +4 | -1

Which does not contain carbohydrate?

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Correct option: B

Wax

The correct answer is B (Wax) because waxes are esters of long-chain fatty acids and long-chain alcohols, and do not contain carbohydrate units.

65 Medium

65 of 191

Understanding +4 | -1

Direct conversion of starch into glucose may be carried out by:

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Correct option: C

Heating it with dil. HCl

Option C (Heating it with dil. HCl) is correct because starch can be directly hydrolyzed into glucose by heating it with dilute hydrochloric acid.

66 Medium

66 of 191

Analyzing +4 | -1

Find the wrong statements

A. Polymers of polysaccharides, fats and proteins are synthesized from monomers by ionic bonding

B. Molecules with polarheads and hydrophobic tails are present in cell membrane

C. Left end of protein chain is

\mathrm{N}

- terminal end

D. Right and left handed helices are observed in protein

View answer and explanation

Correct option: D

A \& D

Option D is correct because polymers are synthesized by covalent bonds, not ionic bonds, and proteins exhibit right-handed helices, but left-handed helices are rare.

67 Easy

67 of 191

Understanding +4 | -1

Point out the wrong statement about proteins.

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Correct option: D

They do not contain polypeptide linkages

Option D (They do not contain polypeptide linkages) is the wrong statement because proteins are formed by polypeptide linkages between amino acids.

68 Hard

68 of 191

Understanding +4 | -1

Assertion (A): There is the coagulation of egg white on boiling.

Reason (R): Denaturation of protein is occur when its native form is subjected to physical change or chemical change.

View answer and explanation

Correct option: A

Both (A) and(R) are correct and (R) is the correct explanation of (A)

Option A (Both (A) and(R) are correct and (R) is the correct explanation of (A)) is correct because the coagulation of egg white on boiling is due to the denaturation of proteins caused by heat.

69 Hard

69 of 191

Understanding +4 | -1

Consider the following statements.

(i) Linkage between two monosaccharide units through oxygen atom is called glycosidic linkage.

(ii) Sucrose on hydrolysis gives an equimolar mixture of fructose and glucose which is dextrorotatory.

(iii) Lactose consists of linkage between

\mathrm{C}_1

of galactose and

\mathrm{C}_4

of glucose.

(iv) Out of two components of starch the component present in greater proportion is insoluble in water.

(v) Glycogen is also known as animal starch because it is structurally similar to amylose a component of starch.
Which of the following is the correct code for statements above?

View answer and explanation

Correct option: D

TFTTF

Option D (TFTTF) is correct because statements (i) and (iii) are true, while (ii), (iv), and (v) are false.

70 Medium

70 of 191

Remembering +4 | -1

Which of the following vitamin is helpful in delaying the blood clotting?

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Correct option: D

Vitamin K

Option D (Vitamin K) is correct because Vitamin K is essential for blood clotting, so it does *not* delay blood clotting; rather, it promotes it.

71 Medium

71 of 191

Understanding +4 | -1

Which of the following is present in animals like cow, buffaloes etc. to digest compound like paper, cloth etc.?

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Correct option: B

Cellulose

Option B (Cellulose) is correct because animals like cows and buffaloes have microorganisms in their digestive systems that can break down cellulose, a major component of paper and cloth.

72 Medium

72 of 191

Understanding +4 | -1

A nucleoside on hydrolysis gives

View answer and explanation

Correct option: C

An aldopentose and a heterocyclic base

Option C (An aldopentose and a heterocyclic base) is correct because a nucleoside is composed of a pentose sugar (aldopentose) and a nitrogenous base (heterocyclic base).

73 Hard

73 of 191

Understanding +4 | -1

Which of the following statements is correct?

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Correct option: C

Rhamnose having formula

\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_5

is a carbohydrate. Though this is not according to general formula of carbohydrates.

Option C is correct because rhamnose (C6H12O5) is a carbohydrate but doesn't fit the general formula Cx(H2O)y, demonstrating that the formula is not a strict requirement.

74 Hard

74 of 191

Understanding +4 | -1

Assertion (A): Amino acids react with acid and base both.

Reason (R): In Zwitter ionic form, amino acids show the amphoteric behaviour.

View answer and explanation

Correct option: A

Both (A) and(R) are correct and (R) is the correct explanation of (A)

Option A (Both (A) and(R) are correct and (R) is the correct explanation of (A)) is correct because amino acids react with both acids and bases due to their amphoteric nature, which is a result of the zwitterionic form.

75 Hard

75 of 191

Understanding +4 | -1

Mostly reactions with sugars are carried out in neutral or
acidic medium, If instead of neutral or acidic medium,
alkaline medium is used to carry out reaction then sugar
will undergoes with _______reaction.

View answer and explanation

Correct option: C

Rearrangement

Option C (Rearrangement) is correct because in alkaline medium, sugars undergo Lobry de Bruyn-van Ekenstein rearrangement.

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76 Easy

76 of 191

Understanding +4 | -1

Which molecule possess the general formula of carbohydrates, but is not a carbohydrate?

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Correct option: C

Acetic acid

Option C (Acetic acid) is correct because acetic acid has the general formula

CH_3COOH

, which does not fit the carbohydrate formula

C_x(H_2O)_y

77 Easy

77 of 191

Remembering +4 | -1

Turpentine oil is obtained from:

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Correct option: B

Pine tree

Option B (Pine tree) is correct because turpentine oil is obtained from pine trees through distillation of resin.

78 Hard

78 of 191

Understanding +4 | -1

Which of the following statements is/are true?

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Correct option: D

All of the above

Option D (All of the above) is correct because fingerprints are unique, DNA sequences are unique, and fingerprints can be altered by surgery.

79 Easy

79 of 191

Remembering +4 | -1

Epimers are pair of diastereoisomeric aldoses which differ only in configuration at position:

View answer and explanation

Correct option: B

{\mathrm{C}_2}

The correct answer is B (

{\mathrm{C}_2}

) because epimers are diastereomers that differ in configuration at only one chiral center, specifically

{\mathrm{C}_2}

in aldoses.

80 Hard

80 of 191

Remembering +4 | -1

The function of glucose is to

View answer and explanation

Correct option: A

provides energy

Option A (provides energy) is correct because glucose is a primary source of energy for the body.

81 Easy

81 of 191

Understanding +4 | -1

Which are not the essential constituents of balanced diet?

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Correct option: D

Hormones

Option D (Hormones) is correct because while important for bodily functions, hormones are not considered essential macronutrients in a balanced diet like carbohydrates, fats, and proteins.

82 Hard

82 of 191

Understanding +4 | -1

Which one of the following statements is not correct?

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Correct option: B

Catabolic reactions are usually accompanied by the absorption of energy.

Option B (Catabolic reactions are usually accompanied by the absorption of energy) is correct because catabolic reactions release energy, they are not accompanied by the absorption of energy.

83 Hard

83 of 191

Application +4 | -1

An optically active compound

A

, gave an

\left[ \alpha \right]_\mathrm{D}^{25} = 30^\circ ,

while a mixture of A and its enantiomer B, gave

\left[ \alpha \right]_\mathrm{D}^{25} = + 15^\circ .

The ratio of

A

and

B

in the mixture is

View answer and explanation

Correct option: B

3 to 1

Option B (3 to 1) is correct because the observed rotation is +15°, while pure A has +30°. This means there's an excess of A over B, and the ratio can be calculated using the formula for optical purity.

84 Medium

84 of 191

Understanding +4 | -1

The detergency of a substance can be increased by addition of :

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because the detergency of a substance can be increased by adding another detergent, builders like sodium tripolyphosphate, or other additives.

85 Easy

85 of 191

Understanding +4 | -1

Glucose and cane sugar can be distinguished by:

View answer and explanation

Correct option: A

Fehling’s solution

Option A (Fehling’s solution) is correct because glucose is a reducing sugar and will reduce Fehling's solution, forming a red precipitate, while cane sugar (sucrose) is a non-reducing sugar and will not react directly with Fehling's solution unless hydrolyzed first.

86 Easy

86 of 191

Understanding +4 | -1

Which of the following is not correct?

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Correct option: D

The metal ion present in vitamin

{B_{12}}\;is\;\mathrm{ }M{g^{2 + }}

Option D (The metal ion present in vitamin

{B_{12}}\;is\;\mathrm{ }M{g^{2 + }}

) is correct because the metal ion present in vitamin B12 is cobalt (Co), not magnesium (Mg).

87 Easy

87 of 191

Understanding +4 | -1

The function of DNA is:

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Correct option: A

To synthesize RNA

Option A (To synthesize RNA) is correct because one of the primary functions of DNA is to serve as a template for RNA synthesis through the process of transcription.

88 Hard

88 of 191

Understanding +4 | -1

Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide?

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Correct option: C

Barfoed test

Option C (Barfoed test) is correct because Barfoed's test is specifically used to distinguish between monosaccharides and disaccharides based on the rate of reduction of copper(II) ions.

89 Medium

89 of 191

Understanding +4 | -1

In an electric field, if an amino acid migrates towards cathode, the pH of the solution is said to be

View answer and explanation

Correct option: A

Less than pI

Option A (Less than pI) is correct because if an amino acid migrates towards the cathode (negative electrode), it must be positively charged, which occurs when the pH is less than the isoelectric point (pI).

90 Medium

90 of 191

Understanding +4 | -1

Which one of the following statement is not true reagarding (+) Lactose?

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Correct option: D

(+) Lactose is a reducing sugar and does not exhibit mutarotation

Option D ((+) Lactose is a reducing sugar and does not exhibit mutarotation) is correct because while lactose is a reducing sugar, it *does* exhibit mutarotation.

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