Medical Quiz

Enzymes and Metabolic Pathways Quiz

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What can alter the shape of the active site of an enzyme?

A. Coenzymes and cofactors

B. Feedback inhibition

C. Temperature and pH

D. Presence of substrate

Which environmental factor can alter the shape of the active site and lead to enzyme denaturation?

A. High temperature

B. Low temperature

C. High pH

D. Low pH

What is the role of enzymes in metabolic pathways?

A. To change the type of chemical reactions

B. To stop chemical reactions

C. To speed up chemical reactions

D. To slow down chemical reactions

How do enzymes function as molecular catalysts?

A. By preventing substrate binding

B. By increasing activation energy barriers

C. By changing the shape of the substrate

D. By decreasing activation energy barriers

What is the effect of low pH and high temperatures on enzyme activity?

A. Denature the enzyme

B. Decrease enzyme efficiency

C. Increase enzyme efficiency

D. No effect on enzyme efficiency

What can act competitively by binding to the enzyme’s active site?

A. Activators

B. Cofactors

C. Coenzymes

D. Inhibitors

Under what conditions does trypsin, an enzyme in the human small intestine, work most efficiently?

A. Low pH

B. High pH

C. Neutral pH

D. High temperature

Which part of the enzyme interacts (binds) with the substrate is called which of the following?

A. Allosteric site

B. Cofactor

C. Active site

D. Coenzyme

What is the optimal pH for pepsin, an enzyme in the stomach?

A. Neutral pH levels

B. Basic pH levels

C. High pH levels

D. Acidic pH levels

What type of regulation occurs when inhibitor molecule is similar enough to a substrate bind to the active site and simply block the substrate from binding?

A. Noncompetitive inhibition

B. Competitive inhibition

C. Feedback inhibition

D. Allosteric regulation


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