Chapter Exam

Chapter 14: Biomolecules — Online MCQ Test

Q: Which of the following is a monosaccharide?

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

Q: The linkage formed between two amino acids in a protein is called:

Answer: C. Peptide bond — A peptide bond forms when the carboxyl group of one amino acid reacts with the amino group of another. This link joins amino acids in proteins.

Q: The open-chain form of glucose contains how many carbon atoms?

Answer: C. 6 — Glucose is a hexose sugar, meaning it contains six carbon atoms. This is true for both its open-chain and cyclic forms.

Q: Which of the following is correctly matched?

Answer: C. Protein — formed by peptide bonds — Proteins are polymers of amino acids joined by peptide bonds. DNA has deoxyribose, RNA usually acts in protein synthesis, and carbohydrates are not formed from amino acids.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 14: Biomolecules with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: This chapter examines biological macromolecules including carbohydrates proteins nucleic acids and lipids. Students study monosaccharide structures amino acid linkages peptide bond.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 14: Biomolecules — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 14: 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 single sugar unit, so it is a monosaccharide. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.

The linkage formed between two amino acids in a protein is called:

A. Glycosidic bond
B. Hydrogen bond
C. Peptide bond ✓
D. Ester bond

Answer: C. Peptide bond
A peptide bond forms when the carboxyl group of one amino acid reacts with the amino group of another. This link joins amino acids in proteins.

The open-chain form of glucose contains how many carbon atoms?

A. 4
B. 5
C. 6 ✓
D. 7

Answer: C. 6
Glucose is a hexose sugar, meaning it contains six carbon atoms. This is true for both its open-chain and cyclic forms.

Which of the following is correctly matched?

A. RNA — genetic material in most cells
B. DNA — contains ribose sugar
C. Protein — formed by peptide bonds ✓
D. Carbohydrate — formed by amino acids

Answer: C. Protein — formed by peptide bonds
Proteins are polymers of amino acids joined by peptide bonds. DNA has deoxyribose, RNA usually acts in protein synthesis, and carbohydrates are not formed from amino acids.

Which of the following is the most appropriate reason why sucrose is non-reducing?

A. It does not contain any oxygen atom
B. Its anomeric carbons are involved in the glycosidic bond ✓
C. It is a monosaccharide
D. It contains only fructose units

Answer: B. Its anomeric carbons are involved in the glycosidic bond
In sucrose, both anomeric carbons of glucose and fructose are linked through the glycosidic bond, so no free reducing group is available. Hence it is non-reducing.