MCQs

11262 questions found

Practice Questions

A patient with chronic kidney disease may have difficulty regulating acid-base balance. The kidneys play a crucial role in maintaining pH by regulating the excretion of:

A. Carbon dioxide

B. Bicarbonate

C. Hydrogen ions and bicarbonate ✓

D. Oxygen

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Jun 6, 2026

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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Jun 6, 2026

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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Jun 6, 2026

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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Jun 6, 2026

The primary function of carbohydrates in the human body is:

A. Structural support

B. Genetic information storage

C. Energy production ✓

D. Hormone synthesis

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Jun 6, 2026

A lipid that acts as a messenger molecule and plays roles in inflammation, blood clotting, and smooth muscle contraction is:

A. Cholesterol

B. Triglyceride

C. Prostaglandin ✓

D. Phospholipid

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Jun 6, 2026

A patient with a deficiency in a specific trace mineral experiences impaired thyroid hormone synthesis, leading to hypothyroidism. This mineral is:

A. Iron

B. Zinc

C. Iodine ✓

D. Calcium

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Jun 6, 2026

The process of DNA replication is considered semiconservative because:

A. Both new strands are composed entirely of new nucleotides.

B. Both original strands are entirely preserved.

C. Each new DNA molecule consists of one original strand and one newly synthesized strand. ✓

D. Replication occurs in a linear fashion.

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Jun 6, 2026

A substance that has both hydrophilic and hydrophobic properties is described as:

A. Polar

B. Nonpolar

C. Amphipathic ✓

D. Hydrophobic

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Jun 6, 2026

A patient presents with beriberi, characterized by neurological and cardiovascular symptoms. This condition is caused by a deficiency of:

A. Vitamin B3 (Niacin)

B. Vitamin B1 (Thiamine) ✓

C. Vitamin B2 (Riboflavin)

D. Vitamin B6 (Pyridoxine)

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Jun 6, 2026

A genetic mutation results in a premature stop codon in the mRNA sequence, leading to a truncated, non-functional protein. This type of mutation is called a:

A. Silent mutation

B. Missense mutation

C. Nonsense mutation ✓

D. Frameshift mutation

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Jun 6, 2026

The metabolic pathway that generates ATP from glucose under anaerobic conditions, producing pyruvate and a small amount of ATP, is:

A. Krebs Cycle

B. Oxidative Phosphorylation

C. Glycolysis ✓

D. Beta-oxidation

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Jun 6, 2026

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MCQs

Practice Questions

A patient with chronic kidney disease may have difficulty regulating acid-base balance. The kidneys play a crucial role in maintaining pH by regulating the excretion of:

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:

The primary function of carbohydrates in the human body is:

A lipid that acts as a messenger molecule and plays roles in inflammation, blood clotting, and smooth muscle contraction is:

A patient with a deficiency in a specific trace mineral experiences impaired thyroid hormone synthesis, leading to hypothyroidism. This mineral is:

The process of DNA replication is considered semiconservative because:

A substance that has both hydrophilic and hydrophobic properties is described as:

A patient presents with beriberi, characterized by neurological and cardiovascular symptoms. This condition is caused by a deficiency of:

A genetic mutation results in a premature stop codon in the mRNA sequence, leading to a truncated, non-functional protein. This type of mutation is called a:

The metabolic pathway that generates ATP from glucose under anaerobic conditions, producing pyruvate and a small amount of ATP, is:

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