Gene expression

Question 1

5 stages of gene expression regulation

Answer 1

Repression, De-repression, Activation. Deactivation, Attenuation.

Question 2

Repression

Answer 2

when a repressor protein blocks transcription of a gene. Binds to promoter region to stop transcription

Question 3

De-repression

Answer 3

when a repressor protein is inactivated and no longer represses.

Question 4

Activation

Answer 4

when an activator protein promotes faster transcription.

Question 5

Deactivation

Answer 5

when the activator protein is inactivated and no longer promotes.

Question 6

Attenuation

Answer 6

when the regulated protein stops being transcribed even in the absence of repression

Question 7

Operons

Answer 7

is gene or series of genes that are bundled together on the same sequence of DNA and whose expression are under the control of at least one regulator protein.

Question 8

Regulon

Answer 8

is a series of operons that are be scattered throughout the genome each of which is under the control of the same regulatory protein. Allows more and more complex regulatory controls over sub sets of the gene in global response