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Biomolecules JENPAS MCQ & Practice Questions

Practice Biomolecules MCQs for JENPAS Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Biomolecules Revision Guide for JENPAS Chemistry

Biomolecules is part of JENPAS 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.

JENPAS Chemistry · Biomolecules · Very Very Hard

1. Carbohydrates are commonly defined as:

  • A. Only amino acids
  • B. Only inorganic salts
  • C. Polyhydroxy aldehydes or ketones, or compounds yielding them on hydrolysis
  • D. Only hydrocarbons
Answer: C
Explanation: Many carbohydrates are polyhydroxy aldehydes/ketones or yield such compounds on hydrolysis.

JENPAS Chemistry · Biomolecules · Very Very Hard

2. Glucose is classified as a:

  • A. Ketopentose
  • B. Aldohexose
  • C. Ketohexose
  • D. Aldopentose
Answer: B
Explanation: Glucose contains six carbons and an aldehydic form.

JENPAS Chemistry · Biomolecules · Very Very Hard

3. Fructose is classified as a:

  • A. Ketohexose
  • B. Aldohexose
  • C. Aldopentose
  • D. Ketopentose
Answer: A
Explanation: Fructose is a six-carbon ketose.

JENPAS Chemistry · Biomolecules · Very Very Hard

4. Ribose is a:

  • A. Ketohexose
  • B. Aldohexose
  • C. Disaccharide
  • D. Aldopentose
Answer: D
Explanation: Ribose is a five-carbon aldose.

JENPAS Chemistry · Biomolecules · Very Very Hard

5. Deoxyribose differs from ribose by having one less:

  • A. Hydrogen atom
  • B. Nitrogen atom
  • C. Oxygen atom
  • D. Carbon atom
Answer: C
Explanation: 2-Deoxyribose lacks one oxygen relative to ribose.

JENPAS Chemistry · Biomolecules · Very Very Hard

6. Glucose and fructose are:

  • A. Optical antipodes
  • B. Functional isomers
  • C. Identical compounds
  • D. Chain isomers only
Answer: B
Explanation: They have the same molecular formula but aldehyde vs ketone functionality.

JENPAS Chemistry · Biomolecules · Very Very Hard

7. The open-chain form of glucose contains:

  • A. An aldehyde group
  • B. A ketone group
  • C. A carboxyl group
  • D. An amide group
Answer: A
Explanation: Glucose is an aldohexose.

JENPAS Chemistry · Biomolecules · Very Very Hard

8. Fructose in its open-chain form contains:

  • A. An aldehyde group
  • B. A carboxyl group
  • C. An ether only
  • D. A ketone group
Answer: D
Explanation: Fructose is a ketohexose.

JENPAS Chemistry · Biomolecules · Very Very Hard

9. Glucose predominantly exists in solution as:

  • A. Only carboxylate ion
  • B. Only ketone form
  • C. Cyclic hemiacetal forms
  • D. Only open-chain aldehyde
Answer: C
Explanation: Intramolecular hemiacetal formation gives cyclic glucopyranose forms.

JENPAS Chemistry · Biomolecules · Very Very Hard

10. The six-membered cyclic form of glucose is called:

  • A. Ribopyranose
  • B. Glucopyranose
  • C. Glucofuranose only
  • D. Fructofuranose
Answer: B
Explanation: The pyranose ring is six-membered including one oxygen.

JENPAS Chemistry · Biomolecules · Very Very Hard

11. Alpha- and beta-D-glucose differ at the:

  • A. Anomeric carbon
  • B. Terminal carbon only
  • C. All chiral carbons
  • D. Carbonyl carbon in open chain only
Answer: A
Explanation: They are anomers differing in configuration at C-1.

JENPAS Chemistry · Biomolecules · Very Very Hard

12. Mutarotation refers to:

  • A. Hydrolysis of peptide bond
  • B. Protein denaturation
  • C. DNA replication
  • D. Change in optical rotation due to interconversion of anomers
Answer: D
Explanation: Alpha and beta anomers interconvert through the open-chain form.

JENPAS Chemistry · Biomolecules · Very Very Hard

13. A reducing sugar must have or generate:

  • A. No oxygen
  • B. Only a ketal group
  • C. A free anomeric carbon capable of opening to carbonyl form
  • D. Only a glycosidic bond at both anomeric carbons
Answer: C
Explanation: Reducing sugars can generate a free aldehyde/ketone functionality.

JENPAS Chemistry · Biomolecules · Very Very Hard

14. Which is a reducing disaccharide?

  • A. Cellulose
  • B. Maltose
  • C. Sucrose
  • D. Both are non-reducing
Answer: B
Explanation: Maltose has one free anomeric carbon.

JENPAS Chemistry · Biomolecules · Very Very Hard

15. Which is a non-reducing sugar?

  • A. Sucrose
  • B. Glucose
  • C. Fructose
  • D. Maltose
Answer: A
Explanation: Both anomeric carbons are involved in sucrose's glycosidic bond.

JENPAS Chemistry · Biomolecules · Very Very Hard

16. Sucrose on hydrolysis gives:

  • A. Two glucose molecules
  • B. Glucose and galactose
  • C. Fructose and galactose
  • D. Glucose and fructose
Answer: D
Explanation: Sucrose is composed of glucose and fructose.

JENPAS Chemistry · Biomolecules · Very Very Hard

17. Maltose on hydrolysis gives:

  • A. Glucose and galactose
  • B. Two fructose molecules
  • C. Two glucose molecules
  • D. Glucose and fructose
Answer: C
Explanation: Maltose consists of two glucose units.

JENPAS Chemistry · Biomolecules · Very Very Hard

18. Lactose on hydrolysis gives:

  • A. Fructose and galactose
  • B. Glucose and galactose
  • C. Glucose and fructose
  • D. Two glucose molecules
Answer: B
Explanation: Lactose is composed of glucose and galactose.

JENPAS Chemistry · Biomolecules · Very Very Hard

19. Starch is a polymer primarily of:

  • A. Alpha-D-glucose
  • B. Beta-D-glucose only
  • C. Fructose only
  • D. Galactose only
Answer: A
Explanation: Starch is built from alpha-D-glucose units.

JENPAS Chemistry · Biomolecules · Very Very Hard

20. Cellulose is a polymer primarily of:

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

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Biomolecules Practice Tests

Biomolecules Frequently Asked Questions

How should I prepare Biomolecules for JENPAS 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.

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What should I do after getting an MCQ wrong?

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