MCQs

11262 questions found

Practice Questions

The central dogma of molecular biology describes the flow of genetic information in cells as:

A. Protein ? DNA ? RNA

B. RNA ? DNA ? Protein

C. DNA ? RNA ? Protein ✓

D. Protein ? RNA ? DNA

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Jun 6, 2026

A lipid that is characterized by a four-ring carbon structure and is a component of cell membranes, but also serves as a precursor for hormones, is:

A. Triglyceride

B. Fatty acid

C. Phospholipid

D. Cholesterol ✓

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Jun 6, 2026

A patient with hypoventilation (slow, shallow breathing) may develop:

A. Respiratory alkalosis

B. Metabolic acidosis

C. Respiratory acidosis ✓

D. Metabolic alkalosis

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Jun 6, 2026

The primary structure of a protein is defined by its:

A. Alpha-helix and beta-sheet content.

B. Three-dimensional folding.

C. Amino acid sequence. ✓

D. Arrangement of multiple subunits.

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Jun 6, 2026

The breaking of a glycosidic bond between two monosaccharides to form individual monosaccharides is a process of:

A. Condensation

B. Hydrolysis ✓

C. Polymerization

D. Oxidation

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Jun 6, 2026

A protein that has a highly stable, fibrous structure and provides strength and elasticity to tissues (e.g., keratin in hair and nails) is likely a:

A. Globular protein

B. Fibrous protein ✓

C. Enzyme

D. Receptor protein

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Jun 6, 2026

A cell increases its metabolic rate to meet higher energy demands. This involves an increase in the rate of which process within the mitochondria?

A. Glycolysis

B. Fermentation

C. Oxidative phosphorylation ✓

D. Gluconeogenesis

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Jun 6, 2026

A patient has high levels of LDL cholesterol in their blood. LDL (low-density lipoprotein) is primarily responsible for:

A. Transporting cholesterol from peripheral tissues back to the liver.

B. Transporting dietary fats from the intestine.

C. Transporting cholesterol from the liver to peripheral tissues. ✓

D. Transporting triglycerides.

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Jun 6, 2026

A type of RNA that carries specific amino acids to the ribosome during protein synthesis is:

A. mRNA

B. rRNA

C. tRNA ✓

D. siRNA

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Jun 6, 2026

The process of glucose phosphorylation, the first step in glycolysis, is catalyzed by:

A. Pyruvate kinase

B. Hexokinase ✓

C. Phosphofructokinase

D. Aldolase

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Jun 6, 2026

A deficiency in Vitamin B12 (Cobalamin) can lead to megaloblastic anemia and neurological problems. Vitamin B12 is essential for:

A. Collagen synthesis

B. Red blood cell maturation and nervous system function ✓

C. Vision

D. Calcium absorption

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Jun 6, 2026

A clinical assay measures the concentration of hydrogen ions in a solution. A solution with a low pH (e.g., pH 2) has a:

A. Low concentration of hydrogen ions

B. High concentration of hydrogen ions ✓

C. Neutral concentration of hydrogen ions

D. No hydrogen ions

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Jun 6, 2026

A patient with extreme malnutrition shows signs of severe muscle wasting. This indicates a significant breakdown of which macronutrient to provide energy?

A. Carbohydrates

B. Lipids

C. Proteins ✓

D. Nucleic acids

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Jun 6, 2026

The enzyme that catalyzes the breaking of a substrate by adding water is known as a(n):

A. Ligase

B. Isomerase

C. Hydrolase ✓

D. Transferase

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Jun 6, 2026

A biochemist is studying a protein that functions as a channel across the cell membrane, allowing specific ions to pass through. This type of protein is primarily involved in:

A. Energy storage

B. Genetic information transfer

C. Transport ✓

D. Structural support

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Jun 6, 2026

The backbone of a DNA strand is composed of alternating:

A. Amino acids and sugars

B. Phosphate groups and deoxyribose sugars ✓

C. Nitrogenous bases and phosphate groups

D. Fatty acids and glycerol

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Jun 6, 2026

A patient with symptoms of rickets (in children) or osteomalacia (in adults) has impaired bone mineralization. This is primarily caused by a deficiency in:

A. Vitamin A

B. Vitamin B

C. Vitamin C

D. Vitamin D ✓

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Jun 6, 2026

The metabolic pathway that uses glucose to produce NADPH and pentoses for nucleotide synthesis is the:

A. Glycolysis

B. Krebs Cycle

C. Pentose Phosphate Pathway ✓

D. Gluconeogenesis

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Jun 6, 2026

A lipid that forms the core of very low-density lipoproteins (VLDL) and is stored in adipose tissue as an energy reserve is:

A. Cholesterol

B. Phospholipid

C. Triglyceride ✓

D. Fatty acid

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Jun 6, 2026

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MCQs

Practice Questions

The central dogma of molecular biology describes the flow of genetic information in cells as:

A lipid that is characterized by a four-ring carbon structure and is a component of cell membranes, but also serves as a precursor for hormones, is:

A patient with hypoventilation (slow, shallow breathing) may develop:

The primary structure of a protein is defined by its:

The breaking of a glycosidic bond between two monosaccharides to form individual monosaccharides is a process of:

A protein that has a highly stable, fibrous structure and provides strength and elasticity to tissues (e.g., keratin in hair and nails) is likely a:

A cell increases its metabolic rate to meet higher energy demands. This involves an increase in the rate of which process within the mitochondria?

A patient has high levels of LDL cholesterol in their blood. LDL (low-density lipoprotein) is primarily responsible for:

A type of RNA that carries specific amino acids to the ribosome during protein synthesis is:

The process of glucose phosphorylation, the first step in glycolysis, is catalyzed by:

A deficiency in Vitamin B12 (Cobalamin) can lead to megaloblastic anemia and neurological problems. Vitamin B12 is essential for:

A clinical assay measures the concentration of hydrogen ions in a solution. A solution with a low pH (e.g., pH 2) has a:

A patient with extreme malnutrition shows signs of severe muscle wasting. This indicates a significant breakdown of which macronutrient to provide energy?

The enzyme that catalyzes the breaking of a substrate by adding water is known as a(n):

A biochemist is studying a protein that functions as a channel across the cell membrane, allowing specific ions to pass through. This type of protein is primarily involved in:

The backbone of a DNA strand is composed of alternating:

A patient with symptoms of rickets (in children) or osteomalacia (in adults) has impaired bone mineralization. This is primarily caused by a deficiency in:

The metabolic pathway that uses glucose to produce NADPH and pentoses for nucleotide synthesis is the:

A lipid that forms the core of very low-density lipoproteins (VLDL) and is stored in adipose tissue as an energy reserve is:

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