Question

mini-quiz: ph and enzymes
based off of your observations, which of the following statements would
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, ii, and iii
b. i and iii only
c. i only
d. ii and iii only
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Explanation:

• Statement I: Substrate movement is related to temperature (kinetic energy) rather than pH. Higher pH doesn't make substrates move faster.
• Statement II: Enzymes have an optimal pH. For example, pepsin in the stomach (acidic pH ~2) and trypsin in the small intestine (alkaline pH ~8). Deviating from the optimal pH reduces enzyme - substrate binding efficiency.
• Statement III: Extreme pH (too high or too low) disrupts the ionic and hydrogen bonds in the enzyme's structure, causing denaturation.

Answer:

D. II and III only