BI-62
Lock-and-key model
Biology · Secondary 3 · Hard · Lock-and-key model
An enzyme in the stomach works best at pH 2. At pH 8, the rate of reaction is very low.
Which statement best explains this using the lock‑and‑key theory?
Which statement best explains this using the lock‑and‑key theory?
- The substrate is used up at pH 8 so no product is formed.
- The enzyme’s active site is destroyed so the substrate cannot fit.
- The substrate changes shape to fit the active site better.
- The enzyme concentration becomes zero at pH 8.
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