Biomolecules Practice Questions

NEET · Biology · 1247 free MCQs with instant results and detailed explanations.

1247

Total

282

Easy

512

Medium

453

Hard

Start Practicing Biomolecules

Take a timed quiz or customize your practice session

Quick Quiz (10 Qs) → Mock Test (25 Qs) ⚙ Customize

Topics in Biomolecules

Proteins 342

Nucleic Acids 204

Carbohydrates 379

Enzymes 98

Lipids 224

Sample Questions from Biomolecules

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

What is the primary function of carbohydrates in living organisms?

A. Energy production

B. Protein synthesis

C. DNA replication

D. Cell membrane structure

Show Answer & Explanation

Correct Answer: A

Carbohydrates are primarily used as a source of energy in living organisms, providing fuel for cellular processes.

Easy

Which of the following is a monosaccharide?

A. Sucrose

B. Fructose

C. Starch

D. Cellulose

Show Answer & Explanation

Correct Answer: B

Fructose is a monosaccharide, a simple sugar, while sucrose is a disaccharide and starch and cellulose are polysaccharides.

Easy

Which polysaccharide is used for energy storage in plants?

A. Glycogen

B. Starch

C. Cellulose

D. Chitin

Show Answer & Explanation

Correct Answer: B

Starch is the polysaccharide that serves as an energy storage molecule in plants.

Medium

Which of the following carbohydrates is the primary energy source for living organisms?

A. Glucose

B. Starch

C. Glycogen

D. Cellulose

Show Answer & Explanation

Correct Answer: A

Glucose is the simplest form of carbohydrate and is used directly by cells for energy through cellular respiration.

Medium

What is the structural difference between alpha and beta glucose?

A. Position of hydroxyl group at C1

B. Number of carbon atoms

C. Presence of nitrogen

D. Type of glycosidic bond

Show Answer & Explanation

Correct Answer: A

The structural difference between alpha and beta glucose lies in the position of the hydroxyl group at the first carbon atom (C1); in alpha glucose, it is below the plane, while in beta glucose, it is above.

Medium

Which of the following carbohydrates is a storage form of glucose in animals?

A. Glucose

B. Starch

C. Cellulose

D. Glycogen

Show Answer & Explanation

Correct Answer: D

Glycogen is the storage form of glucose in animals, primarily stored in muscles and liver, enabling quick energy release.

Medium

How many carbon atoms are present in a molecule of fructose?

A. 5

B. 6

C. 3

D. 12

Show Answer & Explanation

Correct Answer: B

Fructose is a hexose sugar, meaning it contains 6 carbon atoms in its structure, which classifies it among simple sugars.

Hard

What is the molecular formula of starch, the storage polysaccharide in plants?

A. C6H10O5

B. C12H22O11

C. C6H12O6

D. C18H32O16

Show Answer & Explanation

Correct Answer: A

Starch is a polymer of glucose units and its empirical formula is (C6H10O5)n, where 'n' represents the number of glucose units. In contrast, C12H22O11 is the formula for sucrose.

Hard

Which of the following statements about glycosidic bonds is incorrect?

A. They can form between two monosaccharides.

B. They are formed through a condensation reaction.

C. They are broken by hydrolysis.

D. They exist only in polysaccharides.

Show Answer & Explanation

Correct Answer: D

Glycosidic bonds exist not only in polysaccharides but also in disaccharides. Therefore, option D incorrectly limits their occurrence.

Q10

Hard

Which carbohydrate is primarily utilized by humans for energy during intense exercise?

A. Fructose

B. Sucrose

C. Glucose

D. Lactose

Show Answer & Explanation

Correct Answer: C

Glucose is the primary energy source during intense exercise as it is rapidly accessible for cellular respiration, providing quick energy.

Showing 10 of 1247 questions. Start a quiz to practice all questions with scoring and timer.

Practice All 1247 Questions →

More Biology Chapters

1 The Living World

1498 Qs →

2 Biological Classification

1681 Qs →

3 Plant Kingdom

1481 Qs →

4 Animal Kingdom

1484 Qs →

5 Cell: The Unit of Life

1329 Qs →

6 Cell Cycle and Cell Division

1093 Qs →

7 Morphology of Flowering Plants

1571 Qs →

8 Anatomy of Flowering Plants

1930 Qs →

Other NEET Subjects

⚡ Physics → ⚗️ Chemistry →

Biomolecules — NEET Biology Practice Questions Online

This page contains 1247 practice MCQs for the chapter Biomolecules in NEET Biology. The questions are organized by difficulty — 282 easy, 512 medium, 453 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.