Question

when an enzyme is denatured, its ______ changes.
○ shape
○ substrate
○ chemical

4 multiple choice 10 points
some people are lactose intolerant. what food can they not consume?
○ milk
○ eggs
○ bread

5 multiple choice 10 points
enzymes can ______ large sugars like lactose into smaller products.
○ connect
○ break down
○ denature

Explanation:

Question 1 (Enzyme Denaturation)

Enzymes are proteins with a specific 3D structure (shape) crucial for their function. Denaturation involves breaking the bonds maintaining this structure, so the enzyme's shape changes. Substrate is what the enzyme acts on, and "chemical" is too vague. So the correct option is shape.

Lactose is a sugar found in milk. Lactose - intolerant people lack sufficient lactase to digest lactose. Eggs have no lactose, and bread (usually) has little to no lactose. So they can't consume milk.

Enzymes like lactase break down large sugar molecules (lactose) into smaller ones (glucose and galactose). "Connect" would build molecules, and "denature" is about changing enzyme structure, not breaking down sugars. So the correct option is break down.

Answer:

A. shape

Question 4 (Lactose Intolerance)