I have seen the following question in a Cell Biology exam:
Which of the following is true"
The insulin is coded by two genes, the insulin receptor has an hydrophobic sequence in the middle of the protein.
Receptors in the ER bound the SRP that is bounded to the insulin receptor, SRP is made of RNA and proteins.
I think that (1) is the right answer. However, people I talked with thought (3) is the right one.
I think 1 is right because I have never seen anywhere that insulin receptor has a signal peptide so I assumed it does not have. I also think that SRP is a part of the insulin receptor, which is located on the ER (and not bounded to the ER by receptors), this is why I thought (3) is not the right answer.
Am I right, or did I miss anything?