AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

In order to digest milk, the human body must manufacture a protein called lactase. When the digestive system requires lactase, it manufactures the protein based on information stored in what molecule?

A	DNA
B	ATP
C	CO2
D	H2O

Explanation:

Detailed explanation-1: -The small intestine produces lactase, an enzyme that breaks down lactose. The small intestine is an organ that breaks down the food you eat.

Detailed explanation-2: -Lactase is produced by cells that line the walls of the small intestine. These cells, called intestinal epithelial cells, have finger-like projections called microvilli that absorb nutrients from food as it passes through the intestine so they can be absorbed into the bloodstream.

Detailed explanation-3: -Lactase’s function is to break down lactose into the two simple sugars it is made up of, glucose and galactose. Breaking down lactose into its simple sugars makes it possible for it to be absorbed via the small intestine and used by the body.

Detailed explanation-4: -Explain why it is possible for them to digest the proteins in milk even though they lack the lactase enzyme. Enzymes are specific. Lactase only digests lactose. Other enzymes are responsible for the digestion of proteins.

There is 1 question to complete.