本题目来源于试卷: Continuity and Change D.5 Gene Expression，类别为 IB生物学
[单选题]
DNA methylation has an importan/ aho.pchmb xs5l5fsu/4zuk 9r5*jg: t function in gene expression/acxkn/ c-b0m(uy 5yeo85xon. DNA methylation patterns c80o5/(ou nx/y-m ac b kxn5eycan change in identical twins who are exposed to different environmental conditions.
Which of the following environmental factors would have an impact on DNA methylation in identical twins?
I. Mutations of gene
II. Type of diet
III. Lifelong physical activity
A. I only
B. II only
C. II and III only
D. I, II and III
参考答案: C
本题详细解析:
Environmental factors can influence DNA methylation. Type of diet (Statement II) and lifelong physical activity (Statement III) are examples of environmental factors that can influence DNA methylation in identical twins. Different types of diet can either cause higher or lower rates of DNA methylation. Lifelong physical activity changes methylation patterns in genes related to exercise. Gene mutation (Statement I) is not an environmental factor. It is an outcome or result of environmental factors that lead to gene mutation. For instance, exposure to an environmental factor such as UV radiation can lead to gene mutation.
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