Most intracellular receptors are what type of protein?

A) DNA
B) Steroids
C) Enzymes
D) Neurotransmitters
E) Transcription factors

Transcription Factors

Proteins that regulate gene expression by binding to specific DNA sequences, thereby controlling the transfer of genetic information from DNA to mRNA.

Steroids

A large class of organic compounds with a characteristic molecular structure containing four rings of carbon atoms; they include many hormones, alkaloids, and vitamins.

Intracellular Receptors

Proteins located inside the cell that bind to certain substances and initiate a specific cellular response.