MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: B. Advanced immune deficiency caused by HIV infection
Explanation:
AIDS is the advanced stage of HIV infection.
Severe immune suppression permits opportunistic infections and cancers.
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Correct Answer: C. Advanced immune deficiency caused by HIV infection
Explanation:
AIDS is the advanced stage of HIV infection.
Severe immune suppression permits opportunistic infections and cancers.
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Correct Answer: D. Reverse transcriptase
Explanation:
Reverse transcriptase copies viral RNA into DNA.
The viral DNA can then integrate into the host genome.
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Correct Answer: A. Retroviruses
Explanation:
Retroviruses possess an RNA genome and use reverse transcriptase.
HIV is an important human retrovirus.
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Correct Answer: B. Retroviruses
Explanation:
Retroviruses possess an RNA genome and use reverse transcriptase.
HIV is an important human retrovirus.
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Correct Answer: C. Retroviruses
Explanation:
Retroviruses possess an RNA genome and use reverse transcriptase.
HIV is an important human retrovirus.
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Correct Answer: D. A host-derived lipid membrane
Explanation:
Enveloped viruses possess a lipid membrane acquired from host cells.
Non-enveloped viruses lack this outer lipid layer.
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Correct Answer: A. A host-derived lipid membrane
Explanation:
Enveloped viruses possess a lipid membrane acquired from host cells.
Non-enveloped viruses lack this outer lipid layer.
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Correct Answer: B. A host-derived lipid membrane
Explanation:
Enveloped viruses possess a lipid membrane acquired from host cells.
Non-enveloped viruses lack this outer lipid layer.
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Correct Answer: C. CD4 helper T lymphocytes
Explanation:
HIV binds mainly to CD4 receptors on helper T cells.
Progressive loss of these cells weakens adaptive immunity.
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Correct Answer: D. CD4 helper T lymphocytes
Explanation:
HIV binds mainly to CD4 receptors on helper T cells.
Progressive loss of these cells weakens adaptive immunity.
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Correct Answer: A. CD4 helper T lymphocytes
Explanation:
HIV binds mainly to CD4 receptors on helper T cells.
Progressive loss of these cells weakens adaptive immunity.
