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What are the functions of ribozymes?A.
The best-characterized ribozymes are the self-splicing group I introns, RNase P, and the hammerhead ribozyme. Most of the activities of these ribozymes are based on two fundamental reactions: transesterification and phosphodiester bond hydrolysis (cleavage).
B.
The substrate for a ribozyme is often an RNA molecule, and it may even be part of the ribozyme itself. When its substrate is RNA, the RNA catalyst can make use of base-pairing interactions to align the substrate for the reaction.
C.
Ribozymes vary greatly in size. A self-splicing group I intron may have more than 400 nucleotides. The hammerhead ribozyme consists of two RNA strands with only 41 nucleotides in all. As with protein enzymes, the 3D structure of ribozymes is important for function.
D.
Ribozymes are inactivated by heating above their melting temperature or by addition of denaturing agents or complementary oligonucleotides, which disrupt normal base-pairing patterns. Ribozymes can also be inactivated if essential nucleotides are changed.
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举一反三
【单选题】给出以下代码,请问该程序的运行结果是什么? class A extends Integer{ int x=0; } 请选择一个正确答案:
A.
代码编译成功。
B.
代码编译错误，因为Integer类是final类，不能被继承。
C.
代码编译错误，因为类A没有方法和构造器。
D.
代码编译成功，但运行时会拋出ArithmeticException异常。
【简答题】简述羊鼻蝇的生活习性。
【单选题】发射模式(TM)中,下面哪一项的说法是错误的()
A.
TM1是单天线端口传输:主要应用于单天线传输的场合
B.
TM2适合于小区边缘信道情况比较复杂,干扰较大的情况,有时候也用于高速的情况
C.
TM3是大延迟分集:合适于终端(UE)高速移动的情况
D.
TM4是RAnk1的传输:主要适合于小区边缘的情况
【简答题】简述羊的生活习性。
【简答题】简述牛羊的生活习性。
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