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Practice Questions

A forensic scientist is analyzing a blood sample. They extract a molecule that is a long, unbranched polymer of nucleotides, containing the bases A, U, G, and C, and is involved in protein synthesis. This molecule is most likely:

A. DNA
B. mRNA ✓
C. tRNA
D. rRNA
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Jun 6, 2026

A patient requires intravenous fluid administration. A solution with a pH of 7.4 is considered physiologically neutral, as it matches the approximate pH of blood. A solution with a pH of 6.0 would be considered:

A. Strongly alkaline
B. Slightly alkaline
C. Acidic ✓
D. Neutral
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Jun 6, 2026

During strenuous exercise, muscle cells may experience a limited supply of oxygen. In this anaerobic condition, pyruvate is converted to lactate, allowing glycolysis to continue and produce a small amount of ATP. This process is known as:

A. Krebs Cycle
B. Oxidative phosphorylation
C. Lactic acid fermentation ✓
D. Gluconeogenesis
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Jun 6, 2026

A medical researcher is investigating a new drug that inhibits a specific enzyme by binding to its active site, preventing the substrate from binding. This type of enzyme inhibition is best described as:

A. Non-competitive inhibition
B. Allosteric inhibition
C. Competitive inhibition ✓
D. Uncompetitive inhibition
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Jun 6, 2026

A common dietary deficiency is a lack of certain vitamins. A patient presents with symptoms of scurvy, including bleeding gums and poor wound healing. This condition is caused by a deficiency of:

A. Vitamin A
B. Vitamin B1 (Thiamine)
C. Vitamin C (Ascorbic Acid) ✓
D. Vitamin D
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Jun 6, 2026

A student is tasked with drawing the basic structure of an amino acid. They correctly identify that all amino acids found in proteins contain a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a unique side chain (R-group). The R-group primarily determines the amino acid’s:

A. Melting point
B. Size
C. Polarity and chemical properties ✓
D. Molecular weight
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Jun 6, 2026

A patient with uncontrolled diabetes is experiencing severe muscle weakness and fatigue. Biochemically, this could be linked to an impaired ability of cells to generate ATP effectively through glucose oxidation. Which of the following molecules directly acts as the primary energy currency of the cell?

A. Glucose
B. ADP
C. AMP
D. ATP ✓
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Jun 6, 2026

A molecular biologist is studying the structure of DNA. They recall that the two strands of the DNA double helix are held together by hydrogen bonds between complementary base pairs. Which base pairing correctly describes this interaction?

A. Adenine with Guanine, Cytosine with Thymine
B. Adenine with Thymine, Cytosine with Guanine ✓
C. Adenine with Cytosine, Guanine with Thymine
D. Adenine with Uracil, Cytosine with Guanine
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Jun 6, 2026

A dietician is explaining the importance of different types of fats in the diet. They describe a lipid molecule composed of a glycerol backbone esterified to three fatty acids. This molecule is commonly known as a:

A. Phospholipid
B. Steroid
C. Triglyceride ✓
D. Waxes
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Jun 6, 2026

A clinical scenario involves a patient with a genetic defect affecting a mitochondrial enzyme crucial for aerobic respiration. Which of the following metabolic pathways would be most directly and significantly impacted by this defect?

A. Glycolysis
B. Pentose Phosphate Pathway
C. Krebs Cycle (Citric Acid Cycle) ✓
D. Glycogenesis
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Jun 6, 2026
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