Are Constitutive Genes Always Transcribed?

Constitutive genes are those that are always active. Genes for ribosomes are an example. They are constantly being transcribed because ribosomes are constantly needed for protein synthesis. ... For example, some genes needed for nerve cell function will be silenced in muscle cells.

Are constitutive genes always expressed?

Some genes are constitutive, or always "on," regardless of environmental conditions. Such genes are among the most important elements of a cell's genome, and they control the ability of DNA to replicate, express itself, and repair itself. ... The repressor or activator protein binds near its regulatory target: the gene.

Are all genes always transcribed?

Not all the genes in your body are turned on at the same time, or in the same cells or parts of the body. For many genes, transcription is the key on/off control point: If a gene is not transcribed in a cell, it can't be used to make a protein in that cell.