Science Homework Help

I’m working on a biology question and need an explanation to help me study.

Which of the following statements is TRUE concerning an orphan nuclear receptor?

Group of answer choices

– It is a protein that transcribes unknown genes.

– It is a transmembrane protein that signals to the nucleus to transcribe unknown genes.

– It is a protein that binds to an unknown signaling molecule.

– It is a transmembrane protein that signals to the nucleus upon binding an unknown ligand.