Signal recognition particle:
A) arrests transcription elongation.
B) arrests translation elongation.
C) catalyzes the removal of signal sequences.
D) is the eukaryotic equivalent of the docking protein.
E) catalyzes translocation of nascent polypeptides across the mitochondrial membrane.

Question

Quizplus · Accepted Answer

The signal recognition particle (SRP) is a ribonucleoprotein complex that recognizes and binds to the signal sequence of a newly synthesized polypeptide chain as it emerges from the ribosome. This binding arrests translation elongation, allowing the SRP to direct the ribosome-nascent chain complex to the endoplasmic reticulum (ER) membrane for further processing and/or translocation.

Signal Recognition Particle