Question

Which of the following mechanisms to regulate gene expression are observed in eukaryotes, but are not generally observed in prokaryotes? Choose all that apply.

		Genes are grouped into operons, which allows transcriptional regulation to turn them all on together.
		RNA silencing selectively targets mRNA and destroys it to prevent further translation.
		Proteins can be activated or deactivated as a form of post-translational regulation.
		Epigenetic regulation can open or condense sectiosn of a chromosome, regulating which genes are transcribed.
		Regulatory proteins can bind to regulatory regions in the DNA and cause transcriptional regulation.
		Pre-mRNA can be spliced to produce different final mRNA molecules during post-transcriptional regulation.

Answer 1

Which of the following mechanisms to regulate gene expression are observed in eukaryotes, but are not generally observed in prokaryotes?

Epigenetic regulation can open or condense section of a chromosome, regulating which genes are transcribed.

Epigenetic regulation is quite common in eukaryotes and rare in prokaryotes.

Pre-mRNA can be spliced to produce different final mRNA molecules during post-transcriptional regulation.

Post-transcriptional modifications are restricted only to eukaryotes. Prokaryotes do not have nucleus. Hence, the transcription and translation are simultaneous processes. Translation starts on the mRNA which is being transcribed.

Other options are wrong.

RNA silencing and post-translational modifications of proteins happen both in eukaryotes and prokaryotes.

Regulatory proteins can bind to regulatory regions in the DNA and cause transcriptional regulation in both eukaryotes and prokaryotes.

Operons occur only in prokaryotes not in eukaryotes