Chapter 14: Biomolecules — Online MCQ Test
CHEMISTRY · CLASS 12th · Tamil Nadu State Board
Practice Chapter 14: Biomolecules with a free chapter-wise online MCQ test.
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.
Chapter 14: 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 single sugar unit, so it is a monosaccharide. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.
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.
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.
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.
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.
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.