Question

which of the following is a function of a signal peptide? a. to direct an mrna molecule into the cisternal space of the er b. to bind rna polymerase to dna and initiate transcription c. to translocate polypeptides across the er membrane d. to terminate translation of the messenger rna e. to signal the initiation of transcription

Answer 1

Signal peptides translocate polypeptides across the membrane of the endoplasmic reticulum. So, the correct option is c.

The signal peptide is generally composed of approximately 20 amino acid residues and can direct protein translocation through the membrane. The signal peptide plays an important role in protein targeting and protein translocation in both prokaryotic and eukaryotic cells.

This transient, short peptide sequence functions like a postal address on the envelope by targeting proteins for secretion or for transfer to specific organelles for further processing. The signal peptide is recognized by the signal recognition particle (SRP) and cleaved by the signal peptidase following transport at the endoplasmic reticulum.

Learn more about the signal peptides here:

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