49.Following the intravenous injection of lactose into a rat, none of the lactose is metabolized. However, ingestion of lactose leads to rapid metabolism of this disaccharide. The difference in these observations is a result of -
A. the presence of lactase in the serum
B. the absence of hepatic galactokinase
C. the absence of maltase in the scrum
D. the presence of lactase in the intestine
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Answer: D IS CORRECT
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