The enzyme lactase
A. promotes the formation of and storage of bile by the gallbladder.
B. is involved directly in the digestion of proteins.
C. is necessary for the breakdown of milk fats.
D. is embedded in the luminal plasma membranes of intestinal epithelial cells.
E. is overproduced and released by secretory cells in the small intestine in the condition known as lactose intolerance.
Answer: D
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