本题目来源于试卷: SL/HL Topic D1.3 Mutation and gene editing，类别为 IB生物学
[单选题]
4. Single nucleotide polp2 90ox wayxc 5cdeke-.c+/sr ymorphisms (SNPs) are a9 2 mk(i -bqpkzwaex3; form of mutation. Which of the following is the best description of an SNP in the DNA base sequencxqe3- i(pkk;w a 2z9mbe?
A. A substitution of a single base.
B. The addition of a single base.
C. A change in a polypeptide sequence.
D. The deletion of a DNA base.
参考答案: A
本题详细解析:
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