The correct sequence of regulation of gene expression in eukaryotes at various levels is:
(A) Transcriptional level
(B) Transport of mRNA from nucleus to the cytoplasm
(C) Processing level
(D) Translational level
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A), (C), (B), (D)
(A) Transcriptional level — first. Control starts where the primary transcript (the first RNA copy of the gene) is formed. If a gene is not transcribed, nothing follows.
(C) Processing level — second. The primary transcript is processed next. This includes splicing, which joins the coding parts and removes the non-coding parts.
(B) Transport of mRNA from nucleus to the cytoplasm — third. Only the processed mRNA leaves the nucleus, so this step comes after processing.
(D) Translational level — last. Translation happens on ribosomes in the cytoplasm, so the mRNA must be there first.
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NCERT Extract:
Regulation of Gene Expression –
