What role does a transcription factor play in a signal transduction pathway? What role does a transcription factor play in a signal transduction pathway? By binding to a plasma membrane receptor it initiates a cascade.

The question is incomplete as it does not have the options which are:

By binding to a plasma membrane receptor it initiates a cascade.

It relays a signal from the cytoplasm to the plasma membrane.

It activates relay proteins.

By binding to DNA it triggers the transcription of a specific gene.

It is a plasma membrane protein that binds signal molecules.

Answer:

By binding to DNA it triggers the transcription of a specific gene

Explanation:

The transcription factors are the protein molecules that bind with a specific sequence of the DNA. These transcription factors after binding to DNA initiates the process of transcription thus act in gene expression.

The transcription factors are involved in the long transduction pathway which has to act on the DNA sequence and produce the enzymes like involved in the synthesis of steroid hormones in the body.

Thus, the selected option is correct.