Midterm 3 Final

Question 1

The ____ is a regulator protein that binds to a region of DNA called the operator and promotes transcription.

Answer 1

Activator

Question 2

An operon is controlled by a a repressor. When the repressor binds to a small molecule, it is released from binding to DNA near the operon. The type of control illustrated is:

Answer 2

Negative inducible

Question 3

An operon is controlled by a repressor. When the repressor binds to a small molecule, it binds to DNA near the operon. The type of control illustrated is:

Answer 3

Negative repressible

Question 4

When a structural gene is under positive repressible control, what would the result be of a mutation that eliminates the activator protein?

Answer 4

Transcription of the structural gene will always be off.

Question 5

When a structural gene is under negative inducible control, what would the result be of a mutation that eliminates the repressor protein?

Answer 5

The gene would always be on.

Question 6

What is the effect of histone methylation?

Answer 6

Either increases or decreases expression, depending on the location of methylation

Question 7

What is the consequence of DNA methylation?

Answer 7

Decreases expression