Practice Questions

The most abundant protein in the human body, providing structural support to connective tissues like skin, bone, and cartilage, is:

A. Hemoglobin

B. Actin

C. Myosin

D. Collagen ✓

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Jun 6, 2026

A mutation in the DNA sequence leads to a change in a single amino acid in the protein sequence. This type of mutation is called a:

A. Silent mutation

B. Missense mutation ✓

C. Nonsense mutation

D. Frameshift mutation

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A carbohydrate that is a common monosaccharide and the primary source of energy for brain cells is:

A. Fructose

B. Galactose

C. Glucose ✓

D. Ribose

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Jun 6, 2026

The transfer of electrons from one molecule to another in a chemical reaction is known as a(n):

A. Hydrolysis reaction

B. Condensation reaction

C. Redox reaction ✓

D. Isomerization reaction

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Jun 6, 2026

A patient with prolonged jaundice has impaired fat absorption and develops bleeding tendencies. This is due to a deficiency in which fat-soluble vitamin crucial for blood clotting?

A. Vitamin A

B. Vitamin D

C. Vitamin E

D. Vitamin K ✓

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Jun 6, 2026

A competitive inhibitor of an enzyme will typically affect the enzyme’s:

A. Vmax? but not Km?

B. Km? but not Vmax? ✓

C. Both Vmax? and Km?

D. Neither Vmax? nor Km?

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Jun 6, 2026

A metabolic process that uses energy to synthesize complex molecules from simpler ones is called:

A. Catabolism

B. Anabolism ✓

C. Metabolism

D. Respiration

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A patient with a genetic condition has an impaired ability to synthesize certain lipoproteins, leading to issues with lipid transport in the blood. Lipoproteins are complexes of:

A. Carbohydrates and proteins

B. Lipids and proteins ✓

C. Nucleic acids and lipids

D. Proteins and minerals

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Jun 6, 2026

The measure of acidity or alkalinity of a solution, based on the concentration of hydrogen ions, is expressed as:

A. Concentration

B. Molarity

C. pH ✓

D. Solubility

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Jun 6, 2026

A biochemist is studying the quaternary structure of a protein. This level of protein structure involves:

A. The sequence of amino acids.

B. The folding of a single polypeptide chain into an alpha-helix or beta-sheet.

C. The overall three-dimensional shape of a single polypeptide chain.

D. The arrangement of multiple polypeptide subunits into a functional complex. ✓

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Practice Questions

The most abundant protein in the human body, providing structural support to connective tissues like skin, bone, and cartilage, is:

A mutation in the DNA sequence leads to a change in a single amino acid in the protein sequence. This type of mutation is called a:

A carbohydrate that is a common monosaccharide and the primary source of energy for brain cells is:

The transfer of electrons from one molecule to another in a chemical reaction is known as a(n):

A patient with prolonged jaundice has impaired fat absorption and develops bleeding tendencies. This is due to a deficiency in which fat-soluble vitamin crucial for blood clotting?

A competitive inhibitor of an enzyme will typically affect the enzyme’s:

A metabolic process that uses energy to synthesize complex molecules from simpler ones is called:

A patient with a genetic condition has an impaired ability to synthesize certain lipoproteins, leading to issues with lipid transport in the blood. Lipoproteins are complexes of:

The measure of acidity or alkalinity of a solution, based on the concentration of hydrogen ions, is expressed as:

A biochemist is studying the quaternary structure of a protein. This level of protein structure involves:

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