In the diagram below, the gray unit represents _____.
C: transcription factors
D: RNA polymerase
E: the promoter
The correct option is D.
Let’s discuss what the other options are and why they are wrong.
RNA or Ribonucleic acid is a polymeric molecule that is essential in different biological roles such as coding, regulation, decoding, and expression of genes.
Deoxyribonucleic acid or DNA is a long molecule that contains a unique genetic code. It carries the instructions for all protein patterns in our bodies.
C. Transcription factors:
A transcription factor is a sequence-specific DNA-binding factor. It is a protein function to control the transcription of genetic information from DNA to mRNA.
Transcription factors regulate the order of genes throughout the life of an organism to make sure it functions properly.
E. the promoter:
A promoter is a part of DNA that leads to the transcription of a particular gene. The Promoters are placed near the transcription start sites of genes, upstream on the DNA.
In the diagram below, the gray unit represents RNA polymerase.
RNA polymerase untwists a portion of the DNA double helix.
An RNA polymerase or ribonucleic acid polymerase (RNAP) is a multi-subunit enzyme. It catalyzes the process of transcription, where a DNA template is synthesized from an RNA polymer.
The RNA polymerase is responsible for copying the sequence of a DNA into an RNA sequence, during the transcription process.
RNA polymerase, which is a complex molecule made of protein subunits, controls the transcription process. During this process, the genetic information of DNA is copied to messenger RNA.
RNA polymerase can be found in all types of species, but the number and composition of proteins can vary across organisms. For example, eukaryotes possess three types of RNA polymerase, while bacteria can have a single type of RNA polymerase.