Chapter Exam

Chapter 9: Biomolecules — Online MCQ Test

Q: Which of the following is a monosaccharide?

Answer: B. Glucose — Glucose is a monosaccharide, meaning it is a simple sugar unit. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.

Q: Proteins are made up of repeating units called:

Answer: C. Amino acids — Amino acids are the monomers of proteins. They join together through peptide bonds to form polypeptides and proteins.

Q: Which carbohydrate is the main storage polysaccharide in plants?

Answer: B. Starch — Starch is the primary storage carbohydrate in plants. Glycogen is the storage polysaccharide in animals.

Q: Amino acids differ from one another mainly in their:

Answer: C. Side chain or R group — All amino acids have a common amino group, carboxyl group, and hydrogen atom attached to the alpha carbon. Their side chain or R group gives each amino acid its unique properties.

BIOLOGY · Grade 11 · CBSE(NCERT)

Practice Chapter 9: Biomolecules with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 BIOLOGY. This chapter covers: Carbohydrates Proteins Lipids Nucleic Acids Enzymes Amino Acids DNA RNA Biomolecules Metabolism. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 9: Biomolecules — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 11 BIOLOGY — Chapter 9: Biomolecules, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a monosaccharide?

A. Sucrose
B. Glucose ✓
C. Starch
D. Cellulose

Answer: B. Glucose
Glucose is a monosaccharide, meaning it is a simple sugar unit. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.

Proteins are made up of repeating units called:

A. Nucleotides
B. Fatty acids
C. Amino acids ✓
D. Monosaccharides

Answer: C. Amino acids
Amino acids are the monomers of proteins. They join together through peptide bonds to form polypeptides and proteins.

Which carbohydrate is the main storage polysaccharide in plants?

A. Glycogen
B. Starch ✓
C. Cellulose
D. Sucrose

Answer: B. Starch
Starch is the primary storage carbohydrate in plants. Glycogen is the storage polysaccharide in animals.

Amino acids differ from one another mainly in their:

A. Carboxyl group
B. Amino group
C. Side chain or R group ✓
D. Peptide bond

Answer: C. Side chain or R group
All amino acids have a common amino group, carboxyl group, and hydrogen atom attached to the alpha carbon. Their side chain or R group gives each amino acid its unique properties.

Which statement about enzymes is most accurate?

A. They are consumed during the reaction
B. They increase activation energy
C. They are specific in action due to the active site ✓
D. They work equally well at all temperatures

Answer: C. They are specific in action due to the active site
Enzyme specificity depends on the complementary fit between the substrate and the active site. Enzymes are not consumed and they lower, not increase, activation energy.