Chapter Exam

Chapter 8: Biomolecules — Online MCQ Test

Q: Which of the following is the most abundant protein in the animal world?

Answer: A. Collagen — Collagen is the most abundant protein in the animal world, while RuBisCO is the most abundant protein in the whole biosphere.

Q: The bond formed between two amino acids is called a __________.

Answer: B. Peptide bond — A peptide bond is formed by the condensation reaction between the carboxyl group of one amino acid and the amino group of another.

Q: Which of the following is a saturated fatty acid?

Answer: B. Palmitic acid — Palmitic acid has 16 carbons with no double bonds, making it a saturated fatty acid.

Q: Consider a DNA molecule with 20% Adenine. What is the percentage of Cytosine?

Answer: B. 30% — According to Chargaff's rule, A=T and G=C. If A=20%, T=20%. Remaining 60% is shared between G and C (30% each).

Q: What happens to the Vmax and Km in competitive inhibition?

Answer: B. Vmax remains unchanged; Km increases. — In competitive inhibition, the inhibitor competes for the active site, requiring more substrate to reach half-maximal velocity (increasing Km), but Vmax remains reachable.

BOTANY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 8: Biomolecules with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th BOTANY. This chapter covers: Focusing on cellular biochemistry this chapter covers carbohydrates proteins lipids nucleic acids and enzymes. Students study enzyme action mechanisms inhibition models and biomole.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 8: Biomolecules — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th BOTANY — Chapter 8: Biomolecules, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the most abundant protein in the animal world?

A. Collagen ✓
B. RuBisCO
C. Insulin
D. Hemoglobin

Answer: A. Collagen
Collagen is the most abundant protein in the animal world, while RuBisCO is the most abundant protein in the whole biosphere.

The bond formed between two amino acids is called a __________.

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

Answer: B. Peptide bond
A peptide bond is formed by the condensation reaction between the carboxyl group of one amino acid and the amino group of another.

Which of the following is a saturated fatty acid?

A. Oleic acid
B. Palmitic acid ✓
C. Linoleic acid
D. Linolenic acid

Answer: B. Palmitic acid
Palmitic acid has 16 carbons with no double bonds, making it a saturated fatty acid.

Consider a DNA molecule with 20% Adenine. What is the percentage of Cytosine?

A. 20%
B. 30% ✓
C. 40%
D. 60%

Answer: B. 30%
According to Chargaff's rule, A=T and G=C. If A=20%, T=20%. Remaining 60% is shared between G and C (30% each).

What happens to the Vmax and Km in competitive inhibition?

A. Vmax increases; Km remains unchanged.
B. Vmax remains unchanged; Km increases. ✓
C. Vmax decreases; Km decreases.
D. Vmax remains unchanged; Km decreases.

Answer: B. Vmax remains unchanged; Km increases.
In competitive inhibition, the inhibitor competes for the active site, requiring more substrate to reach half-maximal velocity (increasing Km), but Vmax remains reachable.

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