Set 6: Central Ideas
Explanation
PASSAGE
The following text describes a biotechnology tool. CRISPR-Cas9 is a genome editing technology that allows researchers to permanently modify genes in living cells and organisms to correct mutations at precise locations in the human genome to treat genetic causes of disease. It functions like a pair of molecular scissors, capable of cutting DNA strands at specific sequences. Once the DNA is cut, the cell's natural repair mechanisms kick in, allowing scientists to add or remove genetic material.
What is the primary function of CRISPR-Cas9 as described in the text?
Detailed Explanation
Choice C is the best answer. The text explicitly states that CRISPR-Cas9 is a 'genome editing technology' that allows researchers to 'modify genes.' It uses the analogy of 'molecular scissors' that are 'capable of cutting DNA strands at specific sequences.' This aligns perfectly with Choice C.
Choice D is incorrect because the text talks about modifying existing genes to correct mutations, not creating new life forms from scratch.
Choice B is incorrect because the text describes it as a tool for editing genes, not as a vaccine.
Choice A is incorrect because 'molecular scissors' is a metaphor for a biological process, not a tool for physical equipment repair.
Key Evidence:
• "modify genes in living cells"
• "functions like a pair of molecular scissors"
• "cutting DNA strands at specific sequences"
Why others are wrong: D (Unsupported - text discusses modification, not creation), B (Inaccurate - functional description differs), A (Misinterpretation - metaphorical language).
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