Which Statement Is TRUE About the Sorting Pathway for Proteins

Multiple Choice

Which statement is TRUE about the sorting pathway for proteins destined for incorporation into lysosomes or the plasma membrane of eukaryotic cells?

A) Binding of SRP to the signal peptide and the ribosome temporarily accelerates protein synthesis.
B) The newly synthesized polypeptides include a signal peptide at their carboxyl termini.
C) The signal peptide is cleaved off inside the mitochondria by signal peptidase.
D) The SRP binds to the signal peptide soon after it appears outside the ribosome.
E) The signal sequence is added to the polypeptide in a posttranslational modification reaction.