【导读】
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1. [单选题]下列哪一项不是呼吸链的组成部分()
A. A.NADHB.NADPHC.FMNH2D.FADH2E.Cytaa
2. [单选题]生物体(organism)编码20种氨基酸的密码个数为()
A. 16
B. 61
C. 64
D. 20
E. 60
3. [单选题]与干扰素的信号转导途径有关的物质是()
A. SOS
B. cAMP
C. MAPKK
D. JAK
E. HSP
4. [单选题]下列关于双链DNA碱基含量关系,哪个是错误的()
A. A+G=C+T
B. A=T
C. A+T=G+C
D. A+C=G+T
E. G=C
5. [单选题]Why will a switch never learn a broadcast address()。
A. Broadcasts only use network layer addressing.
B. A broadcast frame is never forwarded by a switch.
C. A broadcast address will never be the source address of a frame.
D. Broadcast addresses use an incorrect format for the switching table.
E. Broadcast frames are never sent to switches.