Question

In bacteria, which enzyme catalyzes the transcription of all types of RNA (mRNA, tRNA, and rRNA)?
A.DNA dependent RNA polymerase
B.DNA dependent DNA polymerase
C.RNA dependent RNA polymerase
D.RNA dependent DNA polymerase

Answer 1

To speed up the industrial processes synthetic catalysts are used and they are very crucial to the chemical industries. Unlike synthetic catalysts, we have naturally occurring catalysts called enzymes. These enzymes are made up of proteins that have the ability to lower down the activation energy of various biochemical reactions.

Complete answer: DNA dependent RNA polymerase- The process of the transcription of genetic information of the DNA based sequences into the RNA structure is performed by the DNA dependent RNA polymerase. This enzyme has been isolated and highly purified from E.coli. These enzymes catalyze the RNA synthesis in vitro in the presence of a DNA template and in the presence of four ribonucleoside triphosphates.
DNA dependent DNA polymerase- This enzyme is responsible for the direction of the synthesis of a new DNA from the deoxyribonucleotide triphosphate opposite an existing DNA template which has the genetic information which is critical to the survival of the organism.
RNA-dependent RNA polymerase- this is also called RNA replicase enzyme which catalyzes the replication of RNA from a template of RNA. It specifically catalyzes the synthesis of the RNA complementary strand.
RNA-dependent DNA polymerase- This enzyme is also called reverse transcriptase (RT) is a DNA polymerase enzyme that transcribes the single RNA strand into DNA. This enzyme has the ability to synthesis a double helix DNA once the RNA has been transcribed in reverse.
Hence the correct answer is option A, DNA-dependent RNA polymerase.

Note: In many of the prokaryotes a single DNA-dependent RNA polymerase species will transcribe all types of RNA like mRNA, rRNA, and tRNA but its specificity can be controlled by a specific sequence of DNA promoters.