Operons . a. are commonly found in eukaryotic cells. b. are transcribed by rna polymerase ii. c. contain a cluster of genes transcribed as a single mrna. d. can only be regulated by gene activator proteins.

Option (c).

Explanation:

Operons are mostly present in case of prokaryotes but some operons are also present in eukaryotes. These operons shows the polycistronic mRNA. Jacob and Monod explained the concept of Lac operon in bacteria.

Operons contains large number of genes in a cluster. All the genes of the operon are transcribed as a single mRNA.

Thus, the correct answer is option (C).

answer; 60-100; beats per minute