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]
Which statements about +-v1x 0yi/nrrizv hn.g2etlfub *k 15e o54/0m -ogixxr p-b(jtzf5x- yz6c xrmbryonic stem cells and specialised cells is/are not true? 4y(gx -jpior/6- zco5zx bmxtr 5xf0-
I. Embryonic stem cells have higher levels of DNA methylation than differentiated cells
II. Specialised cells are more differentiated than embryonic stem cells
III. Most specialised cells and embryonic stem cells both contain the entire genome of an organism
A. I only
B. I and II
C. II and III
D. I, II and III
参考答案: A
本题详细解析:
Statement I is not true because embryonic stem cells have relatively low levels of DNA methylation, which allows for greater plasticity and potential for differentiation into various cell types. In contrast, differentiated cells often have higher levels of DNA methylation, which contributes to their stable and specialized gene expression patterns. Choice A is correct. Statement II is true, as specialised cells are more differentiated than embryonic stem cells as they are adapted to particular functions. Statement III is true, as the genome of an organism is the complete set of genes in an organism, and most cells in an organism contain the same set of genetic information. Choices B, C and D are incorrect.
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