问题
判断题
cDNA分子是由mRNA前体转录来的,因此也有内含子序列。 ( )
答案
参考答案:错
cDNA分子是由mRNA前体转录来的,因此也有内含子序列。 ( )
参考答案:错
请根据句意从方框中选择合适的动词,并用其适当时态填空,使句子通顺。 | |
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1. How many students ________ there in your class? 2. Please be quiet. We ________ a class meeting right now. 3. ________ Mr. Zhang ________ you English? 4. Li Lei isn’t in. He ________ for his mother outside. 5. My uncle ________ to Shanghai once a week. |