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JEE • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 315 questions

1 Medium

1 of 315

Understanding +4 | -1

Which one of the following compounds is different from the rest in terms of undergoing hydrolysis to form simpler compounds?

View answer and explanation

Correct option: D

Glucose

Option D is correct because glucose is a monosaccharide and cannot be further hydrolyzed into simpler compounds, whereas sucrose, maltose, and lactose are disaccharides that can be hydrolyzed into monosaccharides.

2 Medium

2 of 315

Remembering +4 | -1

Which of the following enzymes, converts glucose to alcohol?

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Correct option: A

Zymase

Option A (Zymase) is correct because zymase is an enzyme complex that catalyzes the fermentation of sugars like glucose into ethanol and carbon dioxide.

3 Medium

3 of 315

Remembering +4 | -1

The one which has least iodine value is

View answer and explanation

Correct option: C

Ghee

Option C (Ghee) is correct because ghee has the lowest degree of unsaturation among the given oils, resulting in the lowest iodine value.

4 Hard

4 of 315

Remembering +4 | -1

Identify the essential amino acids from below:

(A) Valine
(B) Proline

(C) Lysine
(D) Threonine

(E) Tyrosine

Choose the correct answer from the options given
below:

View answer and explanation

Correct option: A

(A),(C) and (D) only

Option A ((A),(C) and (D) only) is correct because Valine, Lysine, and Threonine are essential amino acids that cannot be synthesized by the human body and must be obtained from the diet.

5 Medium

5 of 315

Understanding +4 | -1

Which of the following statements is true about a peptide bond (RCONHR)?

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Correct option: B

It is capable of forming a hydrogen bond.

Option B (It is capable of forming a hydrogen bond) is correct because the N-H group in a peptide bond can act as a hydrogen bond donor, and the C=O group can act as a hydrogen bond acceptor.

6 Medium

6 of 315

Understanding +4 | -1

Peptide and hydrogen bonds are present in the Primary structure of protein is due to

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Correct option: A

Primary and alpha helix structure respectively

Option A (Primary and alpha helix structure respectively) is correct because peptide bonds are characteristic of the primary structure, while hydrogen bonds are crucial for the alpha-helix secondary structure.

7 Easy

7 of 315

Remembering +4 | -1

Ascorbic acid is:

View answer and explanation

Correct option: A

Vitamin C

Option A (Vitamin C) is correct because ascorbic acid is the chemical name for Vitamin C.

8 Easy

8 of 315

Understanding +4 | -1

A nanopeptide contains ……. peptide linkages.

View answer and explanation

Correct option: B

Option B (8) is correct because a nanopeptide, consisting of 9 amino acids, will have 8 peptide linkages.

9 Easy

9 of 315

Remembering +4 | -1

The red colouring matter of blood which transport oxygen contains an element in a system of rings. The element is:

View answer and explanation

Correct option: A

Iron

Option A (Iron) is correct because hemoglobin, the red pigment in blood responsible for oxygen transport, contains iron.

10 Easy

10 of 315

Remembering +4 | -1

Deficiency of vitamin E causes:

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Correct option: A

Sterility

Option A (Sterility) is correct because deficiency of vitamin E is known to cause reproductive issues, including sterility.

11 Medium

11 of 315

Remembering +4 | -1

Glucose on reaction with

{HNO}_3

forms

View answer and explanation

Correct option: B

Saccharic acid

Option B (Saccharic acid) is correct because glucose, when reacted with

{HNO}_3

, gets oxidized to saccharic acid (also known as glucaric acid).

12 Easy

12 of 315

Remembering +4 | -1

Cellulose trinitrate is used in preparation of:

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Correct option: B

Explosives

Option B (Explosives) is correct because cellulose trinitrate, also known as nitrocellulose, is a highly flammable substance used in the production of explosives.

13 Medium

13 of 315

Remembering +4 | -1

Complete hydrolysis of cellulose gives

View answer and explanation

Correct option: C

D-glucose

Option C (D-glucose) is correct because cellulose is a polysaccharide made up of D-glucose units linked by beta-glucosidic bonds, and hydrolysis breaks these bonds to release D-glucose.

14 Easy

14 of 315

Remembering +4 | -1

A distinctive and characteristics functional group of fats is

View answer and explanation

Correct option: B

An ester group

Option B (An ester group) is correct because fats, also known as triglycerides, are esters of fatty acids with glycerol.

15 Easy

15 of 315

Remembering +4 | -1

Iodised salt prevents ……..

View answer and explanation

Correct option: C

Goiter

Option C (Goiter) is correct because iodized salt provides iodine, which prevents iodine deficiency and thus goiter.

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16 Medium

16 of 315

Remembering +4 | -1

Both nitrogen and sulphur containing water soluble vitamin is

View answer and explanation

Correct option: B

Vitamin

{B_1}

Option B (Vitamin

{B_1}

) is correct because Vitamin

{B_1}

(Thiamine) is a water-soluble vitamin that contains both nitrogen and sulfur.

17 Easy

17 of 315

Remembering +4 | -1

Scurvy is caused due to deficiency of :

View answer and explanation

Correct option: C

Ascorbic acid

Option C (Ascorbic acid) is correct because scurvy is caused by a deficiency of Vitamin C, which is also known as ascorbic acid.

18 Medium

18 of 315

Remembering +4 | -1

The commonest disaccharide has the molecular formula

View answer and explanation

Correct option: D

\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}

Option D (

\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}

) is correct because it represents the molecular formula of common disaccharides like sucrose, maltose, and lactose.

19 Easy

19 of 315

Remembering +4 | -1

The organic compounds of high physiological importance which are essential in small amounts for the well being of all human beings are:

View answer and explanation

Correct option: B

Vitamins

Correct Answer + Core Reason: Option B (Vitamins) is correct because vitamins are organic compounds required in small amounts for human well-being.

20 Hard

20 of 315

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 the primary source of energy for the body.

21 Easy

21 of 315

Remembering +4 | -1

Progesterone is secreted by ……..

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Correct option: B

Ovaries

Option B (Ovaries) is correct because progesterone is a steroid hormone primarily secreted by the ovaries in females.

22 Easy

22 of 315

Understanding +4 | -1

The molecular formula of a monobasic saturated fatty acid is:

View answer and explanation

Correct option: A

{\mathrm{C}_n}{\mathrm{H}_{2n}}{\mathrm{O}_2}

Option A is correct because the general formula for a monobasic saturated fatty acid is

C_nH_{2n}O_2

, which corresponds to the formula

C_nH_{2n+1}COOH

23 Easy

23 of 315

Remembering +4 | -1

A metal present in vitamin

{B_{12}}

View answer and explanation

Correct option: D

Cobalt

Option D (Cobalt) is correct because Vitamin B12, also known as cyanocobalamin, contains cobalt as its central metal atom.

24 Easy

24 of 315

Remembering +4 | -1

Which of the following are all disaccharides?

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Correct option: A

Maltose, sucrose, lactose

Option A (Maltose, sucrose, lactose) is correct because all three are disaccharides, formed by the combination of two monosaccharides.

25 Medium

25 of 315

Remembering +4 | -1

Bases common in RNA and DNA are

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Correct option: A

Adenine, guanine, cytosine

Option A (Adenine, guanine, cytosine) is correct because these three bases are common to both RNA and DNA.

26 Medium

26 of 315

Remembering +4 | -1

An example for a saturated fatty acid, presents in nature is

View answer and explanation

Correct option: D

Palmitic acid

Option D (Palmitic acid) is correct as it is a saturated fatty acid with the formula

{\mathrm{C}_{15}}{\mathrm{H}_{31}}\mathrm{COOH}

27 Medium

27 of 315

Remembering +4 | -1

Which set is the correct pairing set (or contains complementary pairs) responsible for the structure of DNA?

(A = adenine, G = guanine, C = cytosine, T = thymine, U = uracil)

View answer and explanation

Correct option: A

A—T, G—C

Option A (A—T, G—C) is correct because adenine pairs with thymine and guanine pairs with cytosine in DNA.

28 Medium

28 of 315

Analyzing +4 | -1

Consider following reagents,

(I)

\mathrm{Br}_2

water

(II) Tollen's reagent and

(III) Fehling's solution.

Which reagent(s) can be used to make distinction between an aldose and a ketose?

View answer and explanation

Correct option: C

(I) only

Option C ((I) only) is correct because bromine water can distinguish between aldoses and ketoses due to its ability to oxidize aldoses but not ketoses.

29 Medium

29 of 315

Remembering +4 | -1

Among the following vitamins the one whose deficiency causes rickets (bone deficiency) is

View answer and explanation

Correct option: C

Vitamin D

Option C (Vitamin D) is correct because a deficiency in Vitamin D is the primary cause of rickets, a bone deficiency disease.

30 Easy

30 of 315

Remembering +4 | -1

Vitamin that assists in blood clotting is

View answer and explanation

Correct option: D

Option D (K) is correct because Vitamin K is essential for the synthesis of clotting factors in the blood, which are necessary for blood coagulation.

Revision notes and key takeaways

Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 315 single-correct-answer MCQs on BIOMOLECULES.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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