Gene Regulation

Front

All the genes in both a prokaryotic cell and a eukaryotic cell are expressed at the same time.

Back

False

Front

Prokaryotes regulate gene expression primarily

Back

in response to changing environmental conditions

Front

One way to regulate the expression of a gene is to control the formation of mRNA. This is called ___ control.

Back

transcriptional

Front

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.

Back

RNA polymerase, promotor

Front

An operon is

Back

a group of related genes and the associated gene switches in prokaryotes

Front

Genes can be shut off (not expressed) when a ___ binds to the ____.

Back

repressor, operator

Front

What molecule can remove a repressor protein from the operator?

Back

an inducer

Front

What is the inducer in the lac operon?

Back

lactose

Front

Genes can be turned on (expressed) when a(n) ____ such as CRP or cAMP receptor protein binds to the CRP binding site.

Back

activator

Front

In the lac operon system, __ must first bind to CRP so that it is capable of binding to the DNA. This occurs when glucose levels are __.

Back

cAMP, low