Question

You have your ABC operon, wherein the A, B, and C genes are only transcribed when the protein DEF is bound to the DNA.

a) What type of mRNA does transcription of the ABC operon produce?

b) What kind of regulation is this an example of?

c) Draw a picture of the operon undergoing this type of regulation.

d) If there was a dramatic increase in DEF protein production, how would this impact quantities of B protein in your cells?

Answer 1

A. This is polycistronic mRNA because single protein complex (DEF) is regulating the transcription of all the three genes, A, B and C.

B. This is an example of inducible gene expression because the presence of DEF complex leads to tje transcription of A, B, C genes.

C.

D. The B gene will be transcribed at higher level. Because the production of DEF is high, all the three genes, A, B, C will be transcribed at higher rates.

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