Class 11 Biology — Chapter 9: Biomolecules
60 practice questions · 20 Easy · 20 Medium · 20 Hard
Practise Class 11 Biology Chapter 9, "Biomolecules", with 60 NCERT-aligned multiple-choice questions. The set is split into 20 Easy, 20 Medium and 20 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and NEET UG.
"Biomolecules" is one of the chapters where diagram-based recall, terminology and NCERT line-by-line accuracy really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Biomolecules, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Biology mastery score. A few sample questions are shown below; sign in free to practise all 60.
Key concepts: Biomolecules (Class 11 Biology)
This chapter covers the chemical constituents of living cells — carbohydrates, proteins, lipids, nucleic acids — and the action of enzymes.
- Primary & secondary metabolites
- Primary metabolites (amino acids, sugars) are essential for basic functions; secondary metabolites (alkaloids, pigments) are not.
- Carbohydrates & lipids
- Carbohydrates are energy sources and structural (cellulose); lipids store energy and form membranes.
- Proteins
- Polymers of amino acids with primary–quaternary structures; perform structural, transport and catalytic roles.
- Nucleic acids
- DNA and RNA, polymers of nucleotides, store and express genetic information.
- Enzymes
- Protein catalysts that lower activation energy; activity depends on temperature, pH and substrate concentration.
💡 Exam tips for Biomolecules
- Enzymes work best at an optimum temperature and pH; beyond it they denature and lose activity.
- Remember the enzyme mechanism: lowering activation energy via the enzyme–substrate complex (lock and key / induced fit).
Sample questions
Building blocks of proteins:
20 standard amino acids polymerise via peptide bonds.
Most enzymes are:
(Some are RNA — ribozymes.)
Storage polysaccharide in animals:
Glycogen in liver and muscle.
Biomolecules — FAQs
What are the key concepts in Class 11 Biology Biomolecules?+
This chapter covers the chemical constituents of living cells — carbohydrates, proteins, lipids, nucleic acids — and the action of enzymes. Key ideas include Primary & secondary metabolites, Carbohydrates & lipids, Proteins, Nucleic acids, Enzymes.
What does Class 11 Biology Chapter 9 (Biomolecules) cover on XamBaaz?+
It covers 60 NCERT-aligned MCQs on "Biomolecules" — 20 Easy, 20 Medium and 20 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and NEET UG.
Are these "Biomolecules" questions free to practise?+
Yes — sign in with Google to practise "Biomolecules" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Biomolecules" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
Practise all 60 questions free
Timed quizzes, instant scoring, streaks and XP. Sign in with Google — no card needed.
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