【单选题】【消耗次数：1】
多数限制性核酸内切酶切割后的DNA末端为（）
①
平头末端
②
3’突出末端
③
5’突出末端
④
粘性末端
⑤
缺口末端
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相关题目
【单选题】
限制性核酸内切酶切割DNA后产生（）
①
3’磷酸基末端和5’羟基末端
②
5’磷酸基末端和3’羟基末端
③
3’磷酸基末端和5’磷酸基末端
④
5’羟基末端和3’羟基末端
⑤
3’羟基末端、5’羟基末端和磷酸
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In the author’s opinion, if you cannot memorize all the new words you are learning, it is because _____.
①
you are forgetful
②
you are not working hard enough
③
you are not interested in memorizing English words
④
you are trying to memorize too many new words at a time
【单选题】
If you listen to the tape again and again, you may ____.
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want to retell the general meaning of what you hear from the tape
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feel so bored that you cannot understand what you hear from the tape
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understand what you hear from the tape better and better
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repeat the exact words you hear from the tape
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able
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unable
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disable
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In the eyes of the author, one should start from ______ in wide reading.
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interesting materials
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books with very few pages
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materials not too difficult
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both A and C
【单选题】
In the first sentence, “by no means” means ____.
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without method
②
not at all
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absolutely
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above all