问题
单项选择题
下列关于基因表达的概念叙述正确的是（）
A.其产物总是蛋白质
B.其产物总是RNA
C.其产物可以是RNA或蛋白质
D.其产物不包括RNA
E.其产物不包括蛋白质
答案
参考答案：C
解析：基因表达指在一定调节因素作用下，DNA分子上特定的基因被激活并转录生成RNA，或由此引起蛋白质合成的过程。
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下列关于基因表达的概念叙述正确的是（）
A.其产物总是蛋白质
B.其产物总是RNA
C.其产物可以是RNA或蛋白质
D.其产物不包括RNA
E.其产物不包括蛋白质
参考答案：C
解析：基因表达指在一定调节因素作用下，DNA分子上特定的基因被激活并转录生成RNA，或由此引起蛋白质合成的过程。
请用方框中所给词的适当形式完成这篇短文，并把所缺单词填写在答题卡指定的位置上。 每个空只能填写一个形式正确、意义相符的单词。
 I am a student in Grade Three. I began to learn English the year before last year. English isn’t very小题1: to learn. But I like it very much. 小题2: do I study English? In the first year, I found小题3: very difficult to memorize new words. At first I小题4: a lot of time on them. I learned new words only小题5: reading and writing them.小题6: a few days later I forgot them. Later, with小题7: help of my teachers, I came to know how to do it well. I paid more attention to小题8: and spelling. In this way, I have小题9: a lot of new words by heart. Every morning after I get up, I do some reading. At school I小题10: to speak English with my classmates and review what I have learned. Nothing is too hard if you put your heart into it. |