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Which option shows a correct use of restriction enzymes?

Answer and explanation

Correct answer: Helping isolate a desired gene

Direct answer: Option A, helping isolate a desired gene. In gene cloning, scientists identify the DNA region containing the required gene and use a suitable restriction enzyme to cut the source DNA. The same or a compatible enzyme can cut a vector, such as a plasmid, so the ends can pair. DNA ligase can then join the insert and vector. Option A is correct because restriction enzymes help release and prepare the desired DNA fragment; they do not by themselves complete every cloning step. Option B, making salt sweet, is unrelated to DNA chemistry. Option C, melting stone, is a physical-material process, not an enzyme use in cloning. Option D, coloring oxygen, has no valid role in molecular biology. Exam cue: restriction enzyme cuts, compatible ends pair, and ligase seals.

Related tags

Desired GeneGene CloningRestriction Enzymes

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