Which of the following statements correctly describes the function of a signal peptide?
A) It directs an mRNA molecule into the cisternal space of the ER.
B) It terminates translation of messenger RNA.
C) It helps target a protein to the ER.
D) It signals the initiation of transcription.

Question

Quizplus · Accepted Answer

A signal peptide is a short sequence of amino acids located at the beginning of a protein. Its main function is to direct the protein to the endoplasmic reticulum (ER) for processing and eventual trafficking to the appropriate cellular location. Thus, choice C correctly describes the function of a signal peptide. The other options are incorrect. Choice A is incorrect because the mRNA molecule does not enter the cisternal space of the ER. Choice B is incorrect because a signal peptide has nothing to do with terminating mRNA translation. And choice D is incorrect because a signal peptide does not signal the initiation of transcription.

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