Ribosomes become bound to the membrane of the rough ER after they have started making protein due to the presence of a(n) _____ on the newly made protein which binds to receptors called SRPs (Signal Recognition Particles) on the ER surface.

3000+ review questions on anatomy and physiology. 

Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.