Chapter 3: Biomolecules — Online MCQ Test
BIOTECHNOLOGY · Grade 11 · CBSE(NCERT)
Practice Chapter 3: Biomolecules with a free chapter-wise online MCQ test.
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.
Chapter 3: Biomolecules — Important Questions & Answers
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.
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.
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.
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 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.
Lipids are generally insoluble in water and include fats composed of glycerol and fatty acids. They serve as long-term energy reserves.