Gene Regulation

Front

It is when a gene in DNA is 'turned on', that is, used to make the protein it specifies.

Back

Gene Expression

Front

Are all genes in the body turned on at the same time?

Back

No, not all genes are turned on at the same time, or in the same cells or parts of the body.

Front

The turning on and off of genes in response to different signals.

Back

Gene Regulation

Front

Genes that are expressed all the time.

Back

Constitutive Genes

Front

Genes that are turned on and off as they’re needed by the cell.

Back

Regulated Genes

Front

Genes that are normally off, but can be turned on when substrate is present.

Back

Inducible Genes

Front

Genes that are normally on, but can be turned off when the end product is abundant.

Back

Repressive Genes

Front

It consists of the polycistronic DNA, its promoter, and all additional sequences that function together in regulating transcription.

Back

Operon

Front

It consists of five genes that encode for enzymes for the production of tryptophan in E. coli.

Back

TRP operon

Front

When is the TRP operon switched 'on'?

Back

When tryptophan availability is low.