BI-27
Lock-and-key model
Biology · Secondary 3 · Medium · Lock-and-key model
The diagram shows an enzyme with a specific active site. A student suggests four possible substrates. Which substrate will the enzyme act on?
- Substrate W, which is much larger than the active site.
- Substrate X, whose shape does not match the active site.
- Substrate Y, which fits exactly into the active site.
- Substrate Z, which is too small and cannot touch the active site.
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