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 annqjs/v ml;m-. importa n3t,k;8 ;kjb /4pjtvty m, reoe23mtbnt function in gene expression. DNA methylation patterns can change in identical twins who are exposed to different environmental conditbvre;;k, , njt yptmt3to mk3/b 4je28ions.
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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