Question

Positively regulatory proteins are called
A)Activator
B)Repressors
C)Necessary proteins
D)Accessory proteins

Answer 1

By increasing the rate of transcription, it regulates one or more genes. It binds to the DNA and stimulates transcription of nearby genes. Many of them also enhance in a polymerase binding in which form the closed complex or are transition to the open complex needed for the initiation of transcription.

Complete answer:
-Regulatory proteins or we can say gene regulatory proteins influence the region of DNA molecules, which during the process of transcription, they were transcribed by RNA polymerase.
-The proteins that are included in the transcriptional factors help in controlling the synthesis of proteins in the cells.
-Transcription factors also increase the transcription of a set of a gene. Many of the activators are the DNA binding proteins which generally bind to the enhancers or promoter-proximal elements.
-The position on the DNA where the activator binds refers to as an activator site.
-Activators initiate positive regulation sometimes they are also referred to as inducers whereas Repressors initiate the negative regulation.
-The transcription process either increases in rate or is allowed to continue when the activators or inducers bind to an operon.
-The transcription process is slowed or stops when the repressor binds to an operon.
Activator
The protein CAP is one of the examples of an activator. The protein CAP binds to the promoter in the presence of cAMP and thus increases the RNA polymerase activity.
-CAP does not bind to the promoter in the absence of cAMP.Thus transcription occurs at a lower rate.

Additional Information:
Positive Regulation
-For the transcription process to begin, the binding of a specific protein that is an activator is required.
-The transcription can be regulated by the DNA-bound activators by helping with the ignition. For this, they sometimes bind the RNA polymerase to the promoter.

Negative Regulation
The repressor stops the transcription to start. The repressors prevent the RNA polymerase from binding to the promoter or by blocking its movement.
So, the correct answer is,” Activator”

Note: Activators initiate the positive regulations and Repressors initiate the negative regulations.
-The transcription process area increases in rate or decreases in rate, whenever the activators or the inducers binds to an operator.
-In order to be effective gene regulations, activators and repressors must be able to exist in two form
1)Able to bind to DNA
2)Unable to bind to DNA
Both the state must be happening under proper physical conditions.