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Introduction to Biochemistry: Mastery Test

Mary visits her family doctor because she experiences an upset stomach after drinking milk. The doctor tells her that this symptom is caused by a lack of the enzyme lactase. Lactase breaks down lactose, the sugar in milk, which is made of several parts. What does lactose break down into?

A. monosaccharides
B. amino acids
C. fatty acids
D. nucleotides

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Answer :

GinnyAnswer

Final answer:

Lactase enzyme breaks down lactose in milk into glucose and galactose for absorption in the small intestine.


Explanation:

Lactose Breakdown by Lactase Enzyme:

The enzyme lactase is responsible for breaking down lactose, the sugar in milk, into its component sugars: glucose and galactose. This process occurs in the small intestine, allowing for the absorption of these monosaccharides into the bloodstream for energy production.

Many adults become lactose intolerant due to a decrease in lactase production, leading to undigested lactose reaching the colon and causing digestive issues. Lactase supplements or lactase-added products can help mitigate these symptoms.


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