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举一反三
【单选题】酶原的激活是由于
A.
激活剂将结合在酶原分子上的抑制剂除去
B.
激活剂使酶原的空间构象发生变化
C.
激活剂携带底物进入酶原的活性中心
D.
激活剂使酶原分子的一段肽水解脱落从而形成活性中心
E.
激活剂使酶含量增加
【单选题】Defective Genes and Human Health Each of us carries about half a dozen defective(有缺点的) genes. We remain blissfully(快乐地) unaware of this fact unless we, or one of our close relatives, are amongst the m...
A.
Genetically engineered proteins are better than blood products in treating hemophilia.
B.
Only those who suffer from a genetic disease carry about half a dozen defective genes.
C.
The Y chromosome males have are from their fathers.
D.
Whether a defensive gene produces ill effects has something to do with the environment in which the gene operates.