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Biomolecules WBJEE Practice Questions & MCQs

Practice WBJEE-level Biomolecules MCQs with stepwise answers, clear explanations and concise chapter revision. Try related ChemNexa mock tests for timed practice.

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Biomolecules Revision Guide for WBJEE Chemistry

Biomolecules is part of WBJEE Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Biomolecules, then test recall with mixed MCQs.

What to practise in Biomolecules

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Biomolecules before attempting MCQs.

Exam-style MCQs

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Performance Practice

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Top 20 Biomolecules MCQs with Answers

These public questions are selected from the exact Biomolecules chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

WBJEE Chemistry · Biomolecules · Very Very Hard

1. Glucose is classified as a:

  • A. Polysaccharide
  • B. Protein
  • C. Monosaccharide
  • D. Disaccharide
Answer: C
Explanation: Glucose is a single sugar unit and therefore a monosaccharide.

WBJEE Chemistry · Biomolecules · Very Very Hard

2. Fructose is a:

  • A. Polypeptide
  • B. Ketohexose
  • C. Aldopentose
  • D. Disaccharide
Answer: B
Explanation: Fructose contains six carbons and a ketone functionality in its open-chain form.

WBJEE Chemistry · Biomolecules · Very Very Hard

3. Glucose is an:

  • A. Aldohexose
  • B. Ketohexose
  • C. Aldopentose
  • D. Ketopentose
Answer: A
Explanation: Open-chain glucose contains an aldehyde group and six carbons.

WBJEE Chemistry · Biomolecules · Very Very Hard

4. Sucrose is composed of:

  • A. Two glucose units only
  • B. Glucose and galactose
  • C. Two fructose units
  • D. Glucose and fructose
Answer: D
Explanation: Sucrose is formed from glucose and fructose.

WBJEE Chemistry · Biomolecules · Very Very Hard

5. Maltose is composed of:

  • A. Glucose and galactose
  • B. Two fructose units
  • C. Two glucose units
  • D. Glucose and fructose
Answer: C
Explanation: Maltose contains two glucose residues.

WBJEE Chemistry · Biomolecules · Very Very Hard

6. Lactose is composed of:

  • A. Fructose and galactose
  • B. Glucose and galactose
  • C. Glucose and fructose
  • D. Two glucose units
Answer: B
Explanation: Lactose contains glucose and galactose.

WBJEE Chemistry · Biomolecules · Very Very Hard

7. Which sugar is non-reducing?

  • A. Sucrose
  • B. Maltose
  • C. Lactose
  • D. Glucose
Answer: A
Explanation: Both anomeric centres are involved in the sucrose glycosidic linkage.

WBJEE Chemistry · Biomolecules · Very Very Hard

8. Starch is primarily a polymer of:

  • A. Beta-D-glucose only
  • B. Fructose
  • C. Galactose
  • D. Alpha-D-glucose
Answer: D
Explanation: Starch consists of amylose and amylopectin built from alpha-glucose.

WBJEE Chemistry · Biomolecules · Very Very Hard

9. Cellulose is primarily a polymer of:

  • A. Fructose
  • B. Ribose
  • C. Beta-D-glucose
  • D. Alpha-D-glucose
Answer: C
Explanation: Cellulose contains beta(1→4)-linked glucose residues.

WBJEE Chemistry · Biomolecules · Very Very Hard

10. Glycogen is commonly known as:

  • A. Fruit sugar
  • B. Animal starch
  • C. Plant cellulose
  • D. Milk sugar
Answer: B
Explanation: Glycogen is the principal storage polysaccharide in animals.

WBJEE Chemistry · Biomolecules · Very Very Hard

11. The linkage joining monosaccharide units in many carbohydrates is:

  • A. Glycosidic linkage
  • B. Peptide linkage
  • C. Phosphodiester only
  • D. Disulfide linkage
Answer: A
Explanation: Sugars are joined through glycosidic bonds.

WBJEE Chemistry · Biomolecules · Very Very Hard

12. Proteins are polymers of:

  • A. Monosaccharides
  • B. Nucleotides
  • C. Fatty acids only
  • D. Alpha-amino acids
Answer: D
Explanation: Proteins are polypeptides formed from amino-acid residues.

WBJEE Chemistry · Biomolecules · Very Very Hard

13. The linkage between amino acids in proteins is:

  • A. Ester bond only
  • B. Phosphodiester bond
  • C. Peptide bond
  • D. Glycosidic bond
Answer: C
Explanation: A peptide bond is the -CO-NH- linkage formed between amino acids.

WBJEE Chemistry · Biomolecules · Very Very Hard

14. Amino acids generally contain both:

  • A. Only phosphate groups
  • B. Amino and carboxyl groups
  • C. Aldehyde and ketone groups
  • D. Only hydroxyl groups
Answer: B
Explanation: Typical alpha-amino acids possess -NH2 and -COOH functionalities.

WBJEE Chemistry · Biomolecules · Very Very Hard

15. A zwitterion contains:

  • A. Both positive and negative charges in the same molecule
  • B. Only positive charge
  • C. Only negative charge
  • D. No polar groups
Answer: A
Explanation: Amino acids can exist as dipolar ions.

WBJEE Chemistry · Biomolecules · Very Very Hard

16. The isoelectric point is the pH at which an amino acid has:

  • A. Maximum positive charge only
  • B. Maximum negative charge only
  • C. No atoms
  • D. Zero net charge
Answer: D
Explanation: At pI, positive and negative charges balance overall.

WBJEE Chemistry · Biomolecules · Very Very Hard

17. Essential amino acids are those that:

  • A. Contain no nitrogen
  • B. Are all synthesised sufficiently by the body
  • C. Must be obtained adequately from diet
  • D. Cannot form proteins
Answer: C
Explanation: Essential amino acids cannot be synthesised in adequate amounts by the body.

WBJEE Chemistry · Biomolecules · Very Very Hard

18. Primary structure of a protein refers to its:

  • A. Number of subunits only
  • B. Amino-acid sequence
  • C. Overall globular shape only
  • D. Alpha-helix content only
Answer: B
Explanation: Primary structure is the covalent sequence of residues.

WBJEE Chemistry · Biomolecules · Very Very Hard

19. An alpha helix is an example of:

  • A. Secondary protein structure
  • B. Primary structure
  • C. Quaternary structure only
  • D. Carbohydrate structure
Answer: A
Explanation: Alpha helices are stabilised by backbone hydrogen bonds.

WBJEE Chemistry · Biomolecules · Very Very Hard

20. Beta-pleated sheet is an example of:

  • A. Primary structure
  • B. Nucleic-acid structure
  • C. Lipid structure
  • D. Secondary protein structure
Answer: D
Explanation: Beta sheets are regular secondary structural elements.

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Biomolecules Practice Tests

Biomolecules Frequently Asked Questions

How should I prepare Biomolecules for WBJEE Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with Biomolecules practice?

This page provides public sample questions and links to published ChemNexa tests so you can combine quick revision with structured practice.

What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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