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iVinArrow [24]
3 years ago
8

Suppose there is a protein "A" which binds to a DNA sequence and increases transcription of the gene CBC23. In the presence of m

olecule "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?
Biology
1 answer:
fenix001 [56]3 years ago
7 0

Answer:

A = Activator

B = Effector

Explanation:

An activator is a protein which typically binds to a short (50–1500 bp) region of DNA which might be located either upstream (mainly) or downstream of a gene so as to cause increased transcription. This particular region of DNA is known as enhancer and activator is also  known as transcription factor. Activator is a trans-acting factor which binds to the cis-acting factor which is enhancer so as to enhance transcriptional expression.

But another protein named as effector may restrict activator from binding to the enhancer leading to a decrease in transcriptional expression by binding to the activator allosterically. Allosteric binding of effector to the activator causes conformational change in activator so it can no longer bind the enhancer.

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