5
Answer: ASet 3: Text Structure (Advanced)
Explanation
PASSAGE
The central dogma of molecular biology states: DNA -> RNA -> Protein. However, retroviruses violate this unidirectional flow. They use reverse transcriptase to turn RNA back into DNA, inserting themselves into the host genome.
Which choice best describes the relationship between the sentences?
A. A fundamental rule is established, then a specific biological exception is detailed.✓ Correct
B. A process is described in reverse order.
C. Two unrelated biological facts are listed.
D. It explains how to cure a virus.
Detailed Explanation
Rule: Dogma (Uni-directional). Exception: Retroviruses (Turn RNA back to DNA).
Key Evidence:
• "central dogma"
• "However ... violate"
• "reverse transcriptase"
Why others are wrong: B (Result is reverse, organization is Rule -> Exception.), C (Related.), D (No cure.).