Chapter Exam

Chapter 3: Biomolecules — Online MCQ Test

Q: Which of the following is a monosaccharide?

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

Q: Proteins are polymers of which monomer units?

Answer: C. Amino acids — Proteins are formed by linking amino acids through peptide bonds. This is a basic structural feature of all proteins.

Q: Which of the following is a reducing sugar?

Answer: B. Glucose — Glucose has a free aldehyde group in its open-chain form and acts as a reducing sugar. Sucrose is non-reducing because both anomeric carbons are involved in the bond.

Q: A student tests two biomolecules. Sample X does not give a blue-black color with iodine, but gives a positive test with Benedict’s solution after heating. What is the most likely identity of X?

Answer: B. Glucose — A positive Benedict’s test after heating indicates a reducing sugar, such as glucose. Lack of blue-black coloration with iodine shows it is not starch.

Q: A biomolecule is found to be insoluble in water, made of glycerol and fatty acids, and used mainly for long-term energy storage. It is most likely a:

Answer: C. Lipid — Lipids are generally insoluble in water and include fats composed of glycerol and fatty acids. They serve as long-term energy reserves.

BIOTECHNOLOGY · Grade 11 · CBSE(NCERT)

Practice Chapter 3: Biomolecules with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 BIOTECHNOLOGY. This chapter covers: Biomolecules carbohydrates proteins lipids nucleic acids DNA RNA amino acids enzymes molecular structure biological functions macromolecules metabolism. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 3: Biomolecules — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 11 BIOTECHNOLOGY — Chapter 3: 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 simple sugar and a monosaccharide. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.

Proteins are polymers of which monomer units?

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

Answer: C. Amino acids
Proteins are formed by linking amino acids through peptide bonds. This is a basic structural feature of all proteins.

Which of the following is a reducing sugar?

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

Answer: B. Glucose
Glucose has a free aldehyde group in its open-chain form and acts as a reducing sugar. Sucrose is non-reducing because both anomeric carbons are involved in the bond.

A student tests two biomolecules. Sample X does not give a blue-black color with iodine, but gives a positive test with Benedict’s solution after heating. What is the most likely identity of X?

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

Answer: B. Glucose
A positive Benedict’s test after heating indicates a reducing sugar, such as glucose. Lack of blue-black coloration with iodine shows it is not starch.

A biomolecule is found to be insoluble in water, made of glycerol and fatty acids, and used mainly for long-term energy storage. It is most likely a:

A. Carbohydrate
B. Protein
C. Lipid ✓
D. Nucleic acid

Answer: C. Lipid
Lipids are generally insoluble in water and include fats composed of glycerol and fatty acids. They serve as long-term energy reserves.