The enzyme lactase is found in the membranes of epithelial cells lining the small intestine.
The enzyme is formed by a single polypeptide that folds to give three regions.
• an active site with the free amino group outside the cell
• a short section inside the membrane
• a short section inside the cell
What type of amino acid would be found in each of the three regions?
A
2 )
B
3 )
C
4 )
D
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