Question

mini-quiz: ph and enzymes
based off of your observations, which of the following statements would be true?
i. substrates move faster at higher ph levels.
ii. there is an optimal ph level at which the enzyme works best. above or below the optimal ph, the enzyme becomes less effective.
iii. the enzyme denatures (loses its shape) at ph levels that are too high or too low.
a. i and iii only
b. ii and iii only
c. i only
d. i, ii, and iii
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Explanation:

• Statement I: Substrate movement speed is more related to temperature (kinetic energy) than pH, so I is false.
• Statement II: Enzymes have an optimal pH; outside this range, their activity (effectiveness) decreases, so II is true.
• Statement III: Extreme pH (too high/low) causes enzyme denaturation (shape loss), so III is true.

Thus, II and III are true.

Answer:

B. II and III only