Select the gene regulatory mechanisms that are different between prokaryotes and eukaryotes.

a. multiple general transcription factors are found in eukaryotes.
b. the structure of guanine is different in eukaryotic dna.
c. chromatin packaging occurs in eukaryotes. eukaryotic dna contains enhancers.
d. nuclear export of rna occurs in prokaryotes.

Option (A) and (C).

Explanation:

Gene regulatory mechanism are important for the regulation of the transcription and proper expression of genes. Different regulatory mechanisms are present in prokaryotes and eukaryotes.

The prokaryotes do not require the multiple general transcription factors where as the eukaryotes have different transcription factors like TFIID, TFIIH and TFIIA.  The DNA is packed around the histone protein that form chromatin in eukaryotes. The chromatin packaging includes methylation, ribosylation with the help of enhancers and silencors. The chromatin is absent in case of prokaryotes.

Thus, the correct answer is Option (A) and (C).

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