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【单选题】
嘧啶核苷酸与嘌呤核苷酸合成的不同是:A.
嘧啶核苷酸合成需要天冬氨酸,而嘌呤核苷酸合成时不需要
B.
嘧啶核苷酸合成部位是线粒体,而嘌呤核苷酸合成在胞浆
C.
嘧啶核苷酸合成是先合成嘧啶环,再结合到PRPP上,而嘌呤核苷酸是在PRPP基础上逐步合成
D.
嘧啶核苷酸合成不需要一碳单位参与,而嘌呤核苷酸合成需要
E.
嘧啶核苷酸以补救合成途径合成为主,嘌呤核苷酸以从头合成途径合成为主
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反馈参考答案：
举一反三
【单选题】Section A Directions：In this section there are ten sequences，each with one word or phrase underlined. Choose the one from the four choices marked A，B，C and D that best keeps the meaning of the sentenc...
A.
reasonable
B.
radical
C.
immediate
D.
minimum
【单选题】都江堰的建造使得成都平原由“年年洪灾水患”变为“沃野千里,水旱从人,不知饥馑,时无荒年”,并使直接受益的成都成为“天府之国“。这体现了
A.
技术与人
B.
技术与社会
C.
技术与自然
D.
技术与环境
【简答题】Section I Listening Comprehension (30 minutes) Directions : This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must ans...
【单选题】Section A Directions：In this section there are 10 sentences,each with one word or phrase underlined.Choose he one from the 4 choices marked A,B,C and D that best keeps the meaning of the sentence.Then...
A.
explain
B.
deny
C.
consider
D.
recognize
【简答题】Section a Directions: in this section, you will hear two long conversations at the end of each comversation you will hear four questions. both the comversation and the questions will be spoken only on...
【简答题】Section a Directions: in this section, you will hear two long conversations at the end of each comversation you will hear four questions. both the comversation and the questions will be spoken only on...
【单选题】都江堰的建造使得成都平原由“年年洪灾水患”变为“沃野千里,水旱从人,不知饥馑,时无荒年”,并使受益的成都成为“天府之国”。此案例说明了以下那种关系( )
A.
技术与人
B.
技术与自然
C.
技术与社会
D.
技术与水利
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