Question

select all of the following that are true about enzymes.

check all that apply

a noncompetitive inhibitor of enzymes interferes with the active site of the enzyme

enzymes need to have a precise shape to work correctly

in humans, extremely high fevers can be fatal because enzymes begin to unfold and stop working

some enzymes can work in extreme temperatures or very low ph

Explanation:

1. Analyze the first option: A noncompetitive inhibitor binds to an allosteric site (not the active site) and changes the enzyme's shape, so this is false.
2. Analyze the second option: Enzymes are proteins with specific 3D structures (including the active site shape) needed for substrate binding and catalysis, so this is true.
3. Analyze the third option: High fevers cause enzymes (proteins) to denature (unfold), losing their functional shape, which can be fatal as vital metabolic reactions rely on enzymes, so this is true.
4. Analyze the fourth option: Some enzymes (e.g., from thermophilic bacteria, or enzymes in acidic environments like pepsin in the stomach) can function in extreme temperatures or low pH, so this is true.

Answer:

B. Enzymes need to have a precise shape to work correctly
C. In humans, extremely high fevers can be fatal because enzymes begin to unfold and stop working
D. Some enzymes can work in extreme temperatures or very low pH