Essentials for bacterial regulation

Question 1

a(n) ___ is a stretch of DNA consisting of an operator, a promoter and genes for a related set of proteins, usually making up and entire metabolic pathway

Answer 1

operon!!

Question 2

the ____ is/are arranged sequentially after the promoter

Answer 2

genes of an operon

Question 3

a(n) ____ is a specific nucleotide sequence in DNA that binds RNA plymerase, positioning it to start transcribing RNA at the apporiate place

Answer 3

promoter

Question 4

a(n) ____ codes for a protein, such as a repressor, that controls the transcription of another gene or group of genes

Answer 4

regulatroy genes

Question 5

regulatroy proteins bind to the ____ to control expression of the operon

Answer 5

operator!!

Question 6

a(n) ____ is a protein that inhibits gene transcription. in prokaryotes, this protein binds to the DNA in or near the promoter

Answer 6

repressor

Question 7

a(n) ____ is a specific small molecule that binds to a bacterial regulatory protein and changes its shape so that it cannot bind to an operator, thus switching an operon on

Answer 7

inducer

Question 8

whats the difference between positive and negative regulation?

Answer 8

positive regulation requires an activator binded to the promoter to initiate transcription, no activator means no transcription

negative regulation requires a repressor attached to the promoter to disable transcription. no repressor and transcription will be initiated