Transcription factors are proteins, so they are encoded by genes and made via gene expression (transcription and translation). In this way, they are no different from any other protein in the cell.

Now first off in prokaryotes we have what are called general transcription factors, which are a class of proteins that bind to specific sites on DNA to activate transcription.

It's recognized by one of the general transcription factors, allowing other transcription factors and eventually RNA polymerase to bind. It also contains lots of As and Ts, which make it easy to …

The goal of transcription is to make a RNA copy of a gene's DNA sequence. For a protein-coding gene, the RNA copy, or transcript, carries the information needed to build a polypeptide …

Each gene encodes a transcription factor that is expressed in a specific region of the fly starting early in its development as an embryo. The transcription factors change the expression of …

This growth factor pathway has many targets, which it activates through a signaling cascade that involves phosphorylation (addition of phosphate groups to molecules). Some of the pathway's …

What isn't shown in the diagram is that each kinase phosphorylates the next until one phosphorylates a transcription factor. In most cases, the activated transcription factor then …

The lac repressor is a protein that represses (inhibits) transcription of the lac operon. It does this by binding to the operator, which partially overlaps with the promoter.

In eukaryotic cells like photoreceptors, gene expression is often controlled primarily at the level of transcription. However, that doesn't mean transcription is the last chance for regulation.

The transcription factors bind to certain sequences of DNA in the nucleus and cause transcription of cell division-related genes. The products of these genes are various types of proteins that …