Which of the following statements correctly describes the function of a signal peptide?

Question

Quizplus · Accepted Answer

A signal peptide is a sequence of amino acids at the N-terminus of a protein that directs the protein to the endoplasmic reticulum (ER) for processing and sorting. It functions as a signal for the translocation of the polypeptide across the ER membrane into the lumen of the ER. Therefore, option D is the correct choice. Option A is incorrect because a signal peptide does not direct an mRNA molecule, but rather a polypeptide. Option B is incorrect because RNA polymerase binds to DNA in the promoter region, not to a signal peptide. Option C is incorrect because a signal peptide plays no role in terminating translation. Option E is incorrect because a signal peptide is not involved in the initiation of transcription.

Which of the Following Statements Correctly Describes the Function of a Signal