Mock test 2

Biochemistry Mock Test - 02

15:00

1. Which inhibitor blocks electron transfer from Coenzyme Q to Cytochrome b? A) Rotenone B) Antimycin A C) Oligomycin D) Cyanide

Correct: B. Antimycin A inhibits Complex III.

2. The "Wobble hypothesis" explains: A) Splicing of mRNA B) Replication speed C) Degeneracy of genetic code D) Protein folding

Correct: C. Allows one tRNA to recognize multiple codons.

3. Glucose-6-Phosphatase is primarily found in: A) Muscle B) Brain C) Liver D) Red Blood Cells

Correct: C. Liver uses it to release glucose into the blood.

4. The first stable product of the C3 cycle is: A) RuBP B) 3-PGA C) OAA D) PEP

Correct: B. 3-phosphoglycerate.

5. Which bond defines the primary structure of proteins? A) Hydrogen B) Disulfide C) Peptide D) Ionic

Correct: C. Covalent peptide bonds.

6. Major fuel for the brain during prolonged starvation: A) Fatty acids B) Amino acids C) Ketone bodies D) Glycerol

Correct: C. Brain adapts to ketones.

7. Regulatory enzyme of Heme synthesis: A) Ferrochelatase B) ALA Synthase C) Biliverdin reductase D) Heme oxygenase

Correct: B. Aminolevulinate synthase.

8. If DNA has 20% Guanine, what is the % of Thymine? A) 20% B) 40% C) 30% D) 60%

Correct: C. G+C=40, so A+T=60. T=30.

9. Which of these is an inactive zymogen? A) Insulin B) Trypsinogen C) Amylase D) Lipase

Correct: B. Precursor to Trypsin.

10. Allosteric inhibition is usually: A) Feedback inhibition B) Competitive C) Irreversible D) Covalent modification

Correct: A. End products inhibit early enzymes.