D.
mRNA transcription is stopped in the nucleus is one of the events in the protein synthesis process that demonstrates that gene expression is regulated.
Explanation:
One way to know that a gene is being regulated is by measuring the amount of mRNA transcribed for the gene. If there is little mRNA being transcribed, there is probably a negative feedback mechanism at hand. A repressor may be at work to suppress the transcription of the gene operons by RNA polymerase. In addition, probably histones have been recruited in the region of the gene and the section coiled up into heterochromatin DNA – hindering transcription.
Learn More:
For more on gene regulation check out;
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