Question

Question 16 1 pts Which is true of RNA polymerases in both prokaryotic and eukaryotic organisms? They have the same number of cofactors in prokaryotes and eukaryotes. They are composed of an analogous a 2ßß'w core. They make copies of RNA from either DNA or RNA templates. There is a single enzyme type per organism. Question 17 1 pts What are E. coli sigma (o) subunits in RNA synthesis? transcription factors receptor proteins RNA polymerases ODNA promoter regions

Answer 1

Ans 16) The correct option is "B" (Only the exception is prokaryotes have a sigma factor wheras the eukaryotic RNA polymerase don't have).

Option "C" is incorrect because they don't use RNA template to synthesize RNA.

Option "D" is incorrect because there are many types of RNA polymerases in an organism like RNA polymerase-I transcribe rRNA precursor genes,RNA polymerase-III transcribe tRNA genes,5s rRNA gene etc, RNA polymerase-II transcribe protein encoding genes.

Ans 17) The correct option is "C"

Sigma factor helps the RNA polymerase (prokaryotes) to recognize the consensus sequence present on the promoter.

Ans 11) The correct option is "C".

Telomerase (RNA dependent DNA polymerase) is a ribonucleoprotein and has intrinsic reverse transcriptase (it uses internal RNA template and synthesize DNA complementary to the template).It extends the lagging strand to overcome the problem of end replication.