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经纬仪在站点O,视线稍微下倾瞄准目标点Q,读得竖直度盘读数为92 °18′24′′,则P点的竖直角是 ° ′ ′′
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举一反三
【判断题】Nucleases are essentially proteins, while ribozymes are the nucleic acids.
A.
正确
B.
错误
【单选题】Ribozymes ______.
A.
are RNA molecules
B.
act as catalysts
C.
can build RNA molecules
D.
can carry out exchanges of RNA fragments
E.
all of the above
【多选题】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.
【单选题】下列关于“三个代表”重要思想的叙述,不正确的是
A.
涵盖政治、经济、文化和党的建设等多方面
B.
涉及怎样建设社会主义、怎样建设党的问题
C.
是国际国内新形势下对邓小平理论的发展
D.
是中国共产党第二代领导集体的思想结晶
【简答题】核酶（ribozymes）
【多选题】下列关于“三个代表”重要思想的论述,正确的是
A.
是统一整体,相互联系,相互促进
B.
发展先进生产力是实现最广大人民根本利益的基础条件
C.
人民群众是实现自身利益的根本力量
D.
“三个代表”重要思想开辟了马克思主义的新境界
【多选题】The following biochemical reactions ___________________ can be catalyzed by ribozymes.
A.
peptide bond formation in protein synthesis
B.
RNA splicing, polymerization, phosphorylation, aminoacylation, and alkylation
C.
DNA ligation
D.
C–C bond rotation (isomerization)
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