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【单选题】
请问以下哪一个成语是出自《轲刺秦王》篇:A.
穷途末路
B.
图穷匕见
C.
卧薪尝胆
D.
破釜沉舟
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举一反三
【单选题】Techniques are available to allow one to introduce mutations in proteins at a selected amino acid residue (site-directed mutagenesis). Which step of the signal transduction pathway would be blocked if...
A.
Grb2 binding to the receptor to propagate the response
B.
Binding of the growth factor to the receptor
C.
Induction of a conformational change in the receptor upon growth factor binding
D.
Activation of the receptor ’ s intrinsic tyrosine kinase activity
E.
Dimerization of the receptors
【单选题】-How was it _____ little John had done resulted in so much improvement? -Through his great skills obtained by years of hard work and practice.
A.
that whether
B.
whether that
C.
that what
D.
what that
【简答题】The translation of an mRNA begins with the codon _______, for which a special charged tRNA is required. This initiator tRNA always carries the amino acid methionine (or a modified form of methionine, ...
【判断题】A description of all covalent bonds (mainly peptide bonds and disulfide bonds) linking amino acid residues in a polypeptide chain is its secondary structure.
A.
正确
B.
错误
【单选题】All eukaryotic cells have five major classes of histones, differing in molecular weight and amino acid composition. They are:
A.
H1, H2, H3, H4 and H5
B.
H1A, H1B, H3, H4, and H5
C.
H1 , H2A, H2B, H3, and H4
D.
H1 , H2, H3A, H3B, and H4
【判断题】John Deere established a reputation for building dependable farm tractors. When the company began to build small yard tractors, it insisted on using the same logo on its small mowers as on its large t...
A.
正确
B.
错误
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