Question

A theoretical protein, blue2, is coded for by the blu2 gene. This protein codes for a blue pigment used by the organism to protect it from damaging UV rays from sunlight. The enzyme alterase binding to the blu2 operator halts transcription of blue2. A blu2 operator mutation causes a conformational change that does not allow alterase to bind to operator.
What kind of gene regulation of blue2 is being used?

Positive
Negative
Secondary
Splicing

Answer 1

Negative regulation

Explanation:

The enzymes involved are:

blue 2 protein

enzyme alterase binds to blue 2 operator alters blue 2 transcription.

Mutation in blue 2 operator detest alterase activity.

In negative regulation the alterase ( repressor) binds to the blue gene operator and prevents the transcription of blue gene and hence altering the blue 2 protein production.

After mutation in blue 2 gene operator due to confirmational change alterase does not bind to operator and hence blue 2 gene gets transcribe when transcription factors bind to promoter.