In eukaryotes, the regulation could be exerted at -

(A) Transcriptional level (formation of primary transcript)

(B) Processing level (regulation of splicing)

(C) Transport of mRNA from nucleus to the cytoplasm

(D) Translational level

(A), (B), (C) and (D)

The correct answer is Option (3)- (A), (B), (C) and (D)

Regulation of gene expression refers to a very broad term that may occur at various levels. 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