Gene Regulation

In eukaryotes, proteins that help the RNA polymerase bind to the regulatory region for transcription are called ____________.

• transcription factors

• topoisomerase

• regulatory genes

• activators

Tags

NGSS.HS-LS1-1

A protein that binds to the operator and blocks the RNA polymerase

• regulator

• repressor

• activator

• corepressor

The tryptophan operon is

• permanently turned on.

• turned on when tryptophan is present in the growth medium.

• turned off only when glucose is present in the growth medium.

• turned off when tryptophan is added to the growth medium.

When a gene transcribes unless turned off by a repressor, it is considered _____ control

• negative

• positive

A process of turning genes on and off.

• gene mutation

• gene regulation

• gene process

• gene replication

In order for a gene to be expressed, ___ must bind to the gene's ___, a specific sequence of nucleotides at one end of the gene, thus initiating transcription.

• DNA polymerase, promotor

• DNA polymerase, operator

• RNA polymerase, promotor

• RNA polymerase, operator

A lack of this nonprotein molecule would result in the inability of the cell to "turn off" genes:

• Operon

• Inducer

• Promoter

• Repressor

• Corepressor

In the absence of an inducer, gene expression of an inducible promoter will be

• on

• off

• halfway on

When a gene is activated _________ binds to the DNA at the start of the gene and moves along the DNA to create mRNA

• keritanase

• RNA polymerase

• TAQ polymerase

• catalyase

A certain kind of butterflies produces red pigment in summer but blue in winter. This is probably due to...

• polymerase becoming ligase

• three or more copies of the same chromosomes

• regulation of gene expression

• new viruses in new locations

Tags

NGSS.HS-LS1-1