Enzyme Reaction – Section 1

11. In the reaction, C₆H₁₂O₆ + 6O₂→ 6CO₂ + 6H₂O + energy, which component is being oxidized?

A. C₆H₁₂O₆
B. O₂
C. CO₂
D. H₂O

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12. The fact that β-oxidation of fatty acids occurs in the mitochondria whereas fatty acid synthesis occurs in the cytoplasmic matrix, is an example of regulation of enzymatic activity by the __________ mechanism.

A. compartmentation
B. induction
C. competitive inhibition
D. repression

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13. In the reaction, C₆H₁₂O₆ + 6O₂→ 6CO₂ + 6H₂O + energy, which component is being reduced?

A. O₂
B. CO₂
C. H₂O
D. Energy

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14. The affinity of an enzyme for its substrate, when the enzyme has a Km of 0.50 M will be __________ than the affinity of an enzyme for its substrate when the enzyme has a Km of 0.05 M.

A. greater
B. lesser
C. approximately equal
D. half

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15. Anthranilate synthase, the first enzyme of tryptophan biosynthesis after the branch point shows feedback inhibition and repression due to

A. L-tryptophan
B. D-L-tryptophan hydantoin
C. L-serine
D. pyruvate

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