Which of the following is a plausible mechanism for allowing

Which of the following is a plausible mechanism for allowing different genes in an operon to be expressed at different levels?

A)

Transcriptional regulation by processing and possible splicing of the polycistronic mRNA.

B)

Transcriptional regulation by mechanisms involving repressors and CAP-like regulators.

C)

Translational regulation by alteration of the ribosome-binding sites for each gene or binding of translational repressors to one or a few of the genes.

D)

Regulation by alteration of translation initiation and elongation factors.

Solution

A.Transcriptional regulation by processing and possible splicing of the polycistronic mRNA.

Bacterial operons are polycistronic transcripts that are able to produce multiple proteins from one mRNA transcript.