Question

Suppose there is a protein "A" which binds to a DNA sequence and increases transcription of the gene CBC23. In the presence of molecule "C", protein "A" changes structure and can no longer bind to the DNA sequence, resulting in reduced transcription of CBC23. What terms describe "A" and "C" respectively?

		Enhancer and activator
		Repressor and Effector
		Effector and activator
		Activator and enhancer
		Polymerase and activator
		Activator and effector

Answer 1

Activator and effector

In the question, it is given that protein A is increasing the rate of transcription of the gene. It mean the protein is an activator. The region to which an activator binds on DNA is called as enhancer.

It is also given that proteins C when binds to protein A, changes it s conformation so that it can no longer bind to the DNA sequence. It mean protein C is negatively regulating the activity of protein A. So we can say that protein C is an effector molecule which is negatively affecting the activity of protein A.

​​​​​​​Please rate high.