這幾題是去年中興獸醫的普通動物學題目，由於沒有正確答案可知，
希望大家能幫忙解答疑惑，也希望能找到人願意和我對答案，謝謝！
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.
--->我覺得應該是(B)錯（應該寫成ACC），但是還是不確定(D)的正確性
希望大家能幫忙解惑，謝謝！！
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