Identify the correct sequence of events during regulation of gene expression in eukaryotes.
A. Translational level
B. Transcriptional level
C. Processing level
D. Transport of mRNA from nucleus to the cytoplasm
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → B, C, D, A
(B) Transcriptional level — this comes first. The gene is copied into a primary RNA transcript. Control at this step decides whether the RNA is made at all.
(C) Processing level — this comes second. The primary transcript is cut and joined (splicing) to give mature mRNA, and the control here is the regulation of splicing.
(D) Transport of mRNA from nucleus to the cytoplasm — this comes third. The mature mRNA must leave the nucleus before it can be used.
(A) Translational level — this comes last. Ribosomes in the cytoplasm read the mRNA and make the protein, so this can happen only after the mRNA has been transported.
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NCERT Extract:
Regulation of Gene Expression –
