BI-1275
Lock-and-key model
Biology · Secondary 4 · Medium · Lock-and-key model
A child has a deficiency of the enzyme lactase, which digests lactose in milk.
Using the lock and key hypothesis, why does undigested lactose build up in the small intestine?
Using the lock and key hypothesis, why does undigested lactose build up in the small intestine?
- Lactose cannot fit into any active site, so it is not broken down and remains in the intestine
- Lactose changes the shape of lactase so it digests more slowly
- Lactose is too small to be digested by any enzyme
- Lactose is already an amino acid so enzymes do not act on it
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