Arrange the following steps involved in the regulation of gene expression in correct sequence.
(A) Processing level
(B) Translational level
(C) Transcriptional level
(D) Transport of mRNA from the nucleus to the cytoplasm
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (C), (A), (D), (B)
(C) Transcriptional level — comes first. The gene is first copied into a primary transcript. Regulation can act at this very first step.
(A) Processing level — comes second. The primary transcript is processed, and splicing is regulated here.
(D) Transport of mRNA from the nucleus to the cytoplasm — comes third. Only the processed mRNA can leave the nucleus. This step is regulated too.
(B) Translational level — comes last. The mRNA is read by the ribosome in the cytoplasm to make the polypeptide.
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NCERT Extract:
Regulation of Gene Expression –
