MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: D. A structural polysaccharide in plant cell walls
Explanation:
Cellulose consists of beta-glucose units.
Humans lack enzymes to digest its beta linkages.
Choose an option to check your answer.
Correct Answer: A. A structural polysaccharide in plant cell walls
Explanation:
Cellulose consists of beta-glucose units.
Humans lack enzymes to digest its beta linkages.
Choose an option to check your answer.
Correct Answer: B. Long-term energy storage, membranes, and signaling
Explanation:
Lipids include fats, phospholipids, steroids, and waxes.
They are hydrophobic or amphipathic.
Choose an option to check your answer.
Correct Answer: C. Long-term energy storage, membranes, and signaling
Explanation:
Lipids include fats, phospholipids, steroids, and waxes.
They are hydrophobic or amphipathic.
Choose an option to check your answer.
Correct Answer: D. Long-term energy storage, membranes, and signaling
Explanation:
Lipids include fats, phospholipids, steroids, and waxes.
They are hydrophobic or amphipathic.
Choose an option to check your answer.
Correct Answer: A. Glycerol joined to three fatty acids
Explanation:
Triglycerides are major energy-storage lipids.
They form through ester bonds.
Choose an option to check your answer.
Correct Answer: A. Breaking a bond by adding water
Explanation:
Hydrolysis separates polymers into smaller units.
Water contributes H and OH to the products.
Choose an option to check your answer.
Correct Answer: B. Breaking a bond by adding water
Explanation:
Hydrolysis separates polymers into smaller units.
Water contributes H and OH to the products.
Choose an option to check your answer.
Correct Answer: C. Breaking a bond by adding water
Explanation:
Hydrolysis separates polymers into smaller units.
Water contributes H and OH to the products.
Choose an option to check your answer.
Correct Answer: D. Provide energy and structural support
Explanation:
Carbohydrates include sugars, starches, glycogen, and cellulose.
They serve both energy and structural roles.
Choose an option to check your answer.
Correct Answer: A. Provide energy and structural support
Explanation:
Carbohydrates include sugars, starches, glycogen, and cellulose.
They serve both energy and structural roles.
Choose an option to check your answer.
Correct Answer: B. Provide energy and structural support
Explanation:
Carbohydrates include sugars, starches, glycogen, and cellulose.
They serve both energy and structural roles.
