“多利”是代孕绵羊生的，相貌却与供核绵羊相似，说明在遗传过程中起作用的是（ ）
A．细胞膜
B．细胞质
C．细胞核
D．线粒体
多利羊有三个母亲：一个为它提供了细胞核，一个为它提供了去核的卵细胞，还有一个给它提供了胚胎发育所需的子宫．但多利羊的相貌却最像提供细胞核的母羊，因为细胞核中含有主要的遗传物质染色体，染色体上有DNA，DNA上有遗传相关的片段叫基因，基因决定性状．
故选：C
请先阅读下面的短文，掌握其大意，然后从方框所给的词中选出最恰当的10个，用其适当形式填空，并将答案填写到答题卷的相应位置。每词限用一次。（每小题1分）
When lunch time came on his 小题3: day there, he went to the restaurant of the hotel in his new clothes. The head waiter 小题4: him to the table, took his 小题5: and went away. When he turned and looked at the farmer again, he had a surprise! The farmer had tied his table cloth round his 小题6: . The head waiter immediately（立即） 小题7: another waiter to go to the farmer and told him that people mustn't do 小题8: a thing in his restaurant. So the waiter went to the farmer and said in a friendly 小题9:. "Good morning, sir. Would you like a 小题10: ?" |