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【简答题】
机械加工的基本时间是指______生产对象的尺寸、形状、相对位置、表面状态和材料性质等工艺过程。
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举一反三
【多选题】Why do we think that the ribosome is a ribozyme?
A.
The rRNAs are folded into highly compact, precise three-dimensional structures that form the core of the ribosome. In contrast to the central positioning of the rRNAs, the ribosomal proteins are generally located on the suce, where they fill the gaps and crevices of the folded RN
B.
The main role of the ribosomal proteins seems to be to help fold and stabilize the RNA core, while permitting the changes in rRNA conformation that are necessary for this RNA to catalyze efficient protein synthesis.
C.
Not only are the three tRNA-binding sites (the A, P, and E sites) on the ribosome formed primarily by the rRNAs, but the catalytic site for peptide bond formation is formed by the 23S rRNA of the large subunit; the nearest ribosomal protein is located too far away to make contact with the incoming amino acid or with the growing polypeptide chain.
D.
The catalytic site in this RNA—a peptidyl transferase—is similar in many respects to that found in some protein enzymes: it is a highly structured pocket that precisely orients the two reactants—the elongating polypeptide and the amino acid carried by the incoming tRNA—thereby greatly increasing the likelihood of a productive reaction.
【单选题】Recently, I bought a new apartment(公寓), _______ was high.
A.
which price
B.
the price of which
C.
its price
D.
the price of whose
【简答题】where does it's name come from? Coronaviruses are large group of _____, they consist of core of genetic material surrounded by an envelope of proteins spikes. This gives it the _____ of crown. Crown i...
【简答题】配电所一般为户内型，单台变压器容量不宜超过（ ），一般为2台，进线两回。
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