When translating secretory or membrane proteins, ribosomes are directed to the ER membrane by

When translating secretory or membrane proteins, ribosomes are directed to the ER membrane by

When translating secretory or membrane proteins, ribosomes are directed to the ER membrane by


A) a specific characteristic of the ribosome itself, which distinguishes free ribosomes from bound ribosomes.
B) a signal-recognition particle that brings ribosomes to a receptor protein in the ER membrane.
C) moving through a specialized channel of the nucleus.
D) a chemical signal given off by the ER.
E) a signal sequence of RNA that precedes the start codon of the message.

Answer:  B