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17 Why is the tryp operon of E coli an example of co repression a...

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17 Why is the tryp operon of E coli an example of co repression a The operon is normally off until tryptophan is present in the cell and then it becomes active b The operon is normally on until excessive levels of tryptophan cause the repressor to block the operator c The operon includes five genes Each of these genes represses the activation of the others d Both the promoter and operator sites are repressed at the same time by the repressor e all of the above 18 Which process es may be involved in post transcriptional control in eukaryotic cells a not adding a poly A tail to pre mRNA molecules b not adding a 5 cap to pre mRNA molecules c binding of repressor molecules to promoter operator regions of DNA d binding of co repressors to repressors in the nuclear region of the cell e not adding a poly A tail to pre mRNA molecules and not adding a 5 cap to pre mRNA molecules

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