GMAT 考满分题库

- 语法SC -

Whereas in genetic mutation by insertion extra base pairs are inserted into the DNA, in mutation by substitution one base in the sequence is replaced with another.

  • A

    Whereas in genetic mutation by insertion extra base pairs are inserted into the DNA, in mutation by substitution one base in the sequence is replaced with another.

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  • B

    Whereas in genetic mutation by insertion extra base pairs are inserted into the DNA, mutation by substitution occurs when one base in the sequence is replaced with another.

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  • C

    Unlike genetic mutation by insertion, where extra base pairs are inserted into the DNA, one base in the sequence is replaced with another in mutation by substitution.

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  • D

    Unlike genetic mutation by insertion, where extra base pairs are inserted into the DNA, mutation by substitution replaces one base in the sequence with another.

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  • E

    Unlike the case of extra base pairs inserted into the DNA, which is genetic mutation by insertion, in mutation by substitution one base in the sequence is replaced with another.

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正确答案: A

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