作者yanyun (wish...)
看板TransBioChem
标题[生物] 中兴96年普通动物学的题目
时间Wed Jun 4 10:39:33 2008
这几题是去年中兴兽医的普通动物学题目，由於没有正确答案可知，
希望大家能帮忙解答疑惑，也希望能找到人愿意和我对答案，谢谢！
1. Cells in the S phase of the cell cycle can be labeled selectively with
radioactive ________.
(A) thymidine
(B) cytidine
(C) uridine
(D) adenine
2. When a Xenopus oocyte is stimulated with the hormone progesterone
it enters meiosis and arrests at
(A) prophase I
(B) metaphase I
(C) prophase II
(D) metaphase II
3. Which of the following statements regarding tRNAs is INCORRECT ?
(A) tRNAs are approximately 70-80 bases long and form a cloverleaf
structure.
(B) All tRNAs have a CCA sequence at their 3' terminus.
(C) tRNAs differ in sequence only at the anticodon.
(D) There are several modified bases present in mature tRNAs.
--->我觉得应该是(B)错（应该写成ACC），但是还是不确定(D)的正确性
希望大家能帮忙解惑，谢谢！！
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