MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: C. A heritable feature increasing fitness in a particular environment
Explanation:
Adaptations arise through natural selection acting on variation.
Their usefulness depends on environmental conditions.
Choose an option to check your answer.
Correct Answer: D. A heritable feature increasing fitness in a particular environment
Explanation:
Adaptations arise through natural selection acting on variation.
Their usefulness depends on environmental conditions.
Choose an option to check your answer.
Correct Answer: A. Change in inherited characteristics of populations over generations
Explanation:
Evolution occurs at the population level across generations.
It is driven by mutation, selection, drift, and gene flow.
Choose an option to check your answer.
Correct Answer: A. Temporary protection from transferred antibodies
Explanation:
Maternal antibodies and antibody injections provide passive immunity.
Protection is immediate but usually short-lived.
Choose an option to check your answer.
Correct Answer: C. Kill infected or abnormal host cells
Explanation:
Cytotoxic T cells recognize specific antigens on cell surfaces.
They induce target-cell death.
Choose an option to check your answer.
Correct Answer: D. Exposure to antigenic material to generate protective immune memory
Explanation:
Vaccines prepare adaptive immunity before natural exposure.
They reduce infection, severe disease, or transmission.
Choose an option to check your answer.
Correct Answer: A. Exposure to antigenic material to generate protective immune memory
Explanation:
Vaccines prepare adaptive immunity before natural exposure.
They reduce infection, severe disease, or transmission.
Choose an option to check your answer.
Correct Answer: B. Exposure to antigenic material to generate protective immune memory
Explanation:
Vaccines prepare adaptive immunity before natural exposure.
They reduce infection, severe disease, or transmission.
Choose an option to check your answer.
Correct Answer: C. Temporary protection from transferred antibodies
Explanation:
Maternal antibodies and antibody injections provide passive immunity.
Protection is immediate but usually short-lived.
Choose an option to check your answer.
Correct Answer: D. Temporary protection from transferred antibodies
Explanation:
Maternal antibodies and antibody injections provide passive immunity.
Protection is immediate but usually short-lived.
Choose an option to check your answer.
Correct Answer: B. A noncellular infectious particle requiring a host cell to reproduce
Explanation:
Viruses contain genetic material inside a protein coat.
Some also possess a lipid envelope.
Choose an option to check your answer.
Correct Answer: B. Rapid nonspecific defense present from birth
Explanation:
Innate immunity includes barriers, inflammation, phagocytes, and complement.
It responds quickly to broad pathogen patterns.
