12th Class Biology Molecular basis of inheritance

  • question_answer 29)   Control of gene expression takes place at the level of (a) DNA-replication         (b) transcription               (c) translation                    (d) None of these

    Answer:

                      (b) Considering that gene expression results in the formation of a polypeptide, it can be regulated at several levels. In eukaryotes, the regulation could be exerted at (i) transcriptional level (formation of primary transcript) (ii) processing level (regulation of splicing) (iii) transport of mRNA from nucleus to the cytoplasm (iv) translational level While, in prokaryotes, control of the rate of transcriptional initiation is the predominant sitefor control of gene expression.

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