1.Buffers which lack biological activity and are unlikely to interfere with any biochemical reactions iclude: (a)Tris (b)Hepes (c)phosphate (d)Both Tris and Hepes (e)Both Tris and Phosphate 2.Glycogen phosphorylase can be controlled by all of the following mechanisms except: (a)Covalent modification (b)Inhibition by the glycogen product (c)Subunit association and dissociation (d)Allosteric changes caused by effector molecules 3.Cells that contain "blue screen" plasmid that has an added gene are recognized by the following screening method: (a)Ability to grow on ampicillin (b)Inability to grow on ampicillin (c)The colonies have a blue color (d)The colonies lack the blue color 4.All the following apply to attenuation mechanisms, except: (a)They are used most often for operons for amino acid synthesis (b)They involve the systhesis of proteins in the regulation of RNA synthesis (c)The rate ofRNA synthesis is regulated by the conformation of protein being synthesized (d)They require the presence of partially completed mRNA molecules (e)All of these apply to attenuation mechanisms 5.Which ends of eukaryotic mRNA are protected from degration? (a)5'end only (b)3'end only (c)Both ends (d)Neither ends 麻烦板上各位大大帮忙解答了... 谢谢!!!...orz --

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