Practice Questions

A competitive inhibitor’s effect on an enzyme can typically be overcome by:

A. Increasing temperature.

B. Decreasing substrate concentration.

C. Increasing substrate concentration. ✓

D. Decreasing enzyme concentration.

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Jun 6, 2026

A deficiency in Vitamin D can impair calcium absorption, leading to weakened bones. Vitamin D’s primary role in bone health is to:

A. Directly strengthen bones.

B. Stimulate osteoclast activity.

C. Promote calcium and phosphate absorption in the intestine. ✓

D. Promote protein synthesis.

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Jun 6, 2026

The primary function of the electron transport chain in cellular respiration is to:

A. Synthesize glucose.

B. Produce lactate.

C. Generate a proton gradient to drive ATP synthesis. ✓

D. Break down fatty acids.

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Jun 6, 2026

The nitrogenous base common to both DNA and RNA is:

A. Thymine

B. Uracil

C. Adenine

D. Guanine ✓

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Jun 6, 2026

A solution with a high concentration of hydrogen ions will have a:

A. High pH

B. Low pH ✓

C. Neutral pH

D. Variable pH

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Jun 6, 2026

A protein that exists as a complex of multiple polypeptide chains (e.g., hemoglobin with four subunits) exhibits which level of protein structure?

A. Primary

B. Secondary

C. Tertiary

D. Quaternary ✓

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Jun 6, 2026

The enzyme that catalyzes the final step of the electron transport chain, transferring electrons to oxygen to form water, is:

A. ATP synthase

B. Cytochrome c oxidase ✓

C. NADH dehydrogenase

D. Succinate dehydrogenase

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Jun 6, 2026

A patient with a diet very low in carbohydrates may enter a state where the body produces ketone bodies from fatty acid breakdown to use as an alternative energy source. This process is called:

A. Glycolysis

B. Lipogenesis

C. Ketogenesis ✓

D. Gluconeogenesis

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Jun 6, 2026

The process of joining two smaller molecules together to form a larger one, typically removing a water molecule, is called:

A. Hydrolysis

B. Condensation (dehydration synthesis) ✓

C. Oxidation

D. Reduction

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Jun 6, 2026

A patient with a genetic defect in a mitochondrial enzyme cannot perform the Krebs Cycle efficiently. This would severely impair the cell’s ability to produce:

A. Glucose

B. Fatty acids

C. Large amounts of ATP aerobically ✓

D. Lactic acid

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Jun 6, 2026

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Practice Questions

A competitive inhibitor’s effect on an enzyme can typically be overcome by:

A deficiency in Vitamin D can impair calcium absorption, leading to weakened bones. Vitamin D’s primary role in bone health is to:

The primary function of the electron transport chain in cellular respiration is to:

The nitrogenous base common to both DNA and RNA is:

A solution with a high concentration of hydrogen ions will have a:

A protein that exists as a complex of multiple polypeptide chains (e.g., hemoglobin with four subunits) exhibits which level of protein structure?

The enzyme that catalyzes the final step of the electron transport chain, transferring electrons to oxygen to form water, is:

A patient with a diet very low in carbohydrates may enter a state where the body produces ketone bodies from fatty acid breakdown to use as an alternative energy source. This process is called:

The process of joining two smaller molecules together to form a larger one, typically removing a water molecule, is called:

A patient with a genetic defect in a mitochondrial enzyme cannot perform the Krebs Cycle efficiently. This would severely impair the cell’s ability to produce:

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