MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: A. Chitin
Explanation:
Fungal cell walls contain chitin and other polysaccharides.
Chitin is also found in arthropod exoskeletons.
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Correct Answer: A. Cell shape changes, movement, and contraction
Explanation:
Microfilaments are mainly composed of actin.
They participate in cell crawling, cytokinesis, and muscle contraction.
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Correct Answer: B. Chitin
Explanation:
Fungal cell walls contain chitin and other polysaccharides.
Chitin is also found in arthropod exoskeletons.
Choose an option to check your answer.
Correct Answer: B. Cell shape changes, movement, and contraction
Explanation:
Microfilaments are mainly composed of actin.
They participate in cell crawling, cytokinesis, and muscle contraction.
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Correct Answer: C. Chitin
Explanation:
Fungal cell walls contain chitin and other polysaccharides.
Chitin is also found in arthropod exoskeletons.
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Correct Answer: C. Net movement of particles from higher to lower concentration
Explanation:
Diffusion results from random molecular motion.
It continues until concentration differences are reduced.
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Correct Answer: D. Peptidoglycan
Explanation:
Peptidoglycan forms a strong mesh around bacterial cells.
Its thickness differs between Gram-positive and Gram-negative bacteria.
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Correct Answer: D. Net movement of particles from higher to lower concentration
Explanation:
Diffusion results from random molecular motion.
It continues until concentration differences are reduced.
Choose an option to check your answer.
Correct Answer: A. Peptidoglycan
Explanation:
Peptidoglycan forms a strong mesh around bacterial cells.
Its thickness differs between Gram-positive and Gram-negative bacteria.
Choose an option to check your answer.
Correct Answer: A. Net movement of particles from higher to lower concentration
Explanation:
Diffusion results from random molecular motion.
It continues until concentration differences are reduced.
Choose an option to check your answer.
Correct Answer: B. Peptidoglycan
Explanation:
Peptidoglycan forms a strong mesh around bacterial cells.
Its thickness differs between Gram-positive and Gram-negative bacteria.
Choose an option to check your answer.
Correct Answer: B. Diffusion of water across a selectively permeable membrane
Explanation:
Water moves toward the side with higher effective solute concentration.
Osmosis affects cell volume and turgor.
