16.2 Prokaryotic Gene Regulation

Question 1

operon

Answer 1

collection of genes involved in a pathway that are
transcribed together as a single mRNA in prokaryotic
cells

Question 1

operon

Answer 1

collection of genes involved in a pathway that are
transcribed together as a single mRNA in prokaryotic
cells

Question 2

Repressors

Answer 2

prevent transcription of a gene in response to an external stimulus
(bind to operator regions)

Question 3

activators

Answer 3

increase the transcription of a gene in response to an external stimulus
(bind to the promoter site)

Question 4

Tryptophan

Answer 4

amino acid that can be synthesized by prokaryotic cells when necessary

Question 5

transcriptional start site

Answer 5

site at which transcription begins

Question 6

operator

Answer 6

region of DNA outside of the promoter region
that binds activators or repressors that control gene
expression in prokaryotic cells

Question 7

negative regulators

Answer 7

proteins that bind to the operator to silence trp expression

Question 8

positive regulators

Answer 8

proteins that bind to the promoter sequences to turn genes on and activate them

Question 9

catabolite activator protein (CAP)

Answer 9

protein that binds to the promoters of operons which control the processing of alternative sugars

Question 10

lac operon

Answer 10

encodes the genes necessary to acquire and process the lactose from the local environment