During the translation of mRNA molecules, the new polypeptides are often directed to specific parts of the cell by the presence or absence of short sequences of amino acids called signal peptides. Which of the following would you expect to find in the polypeptide that will eventually fold to become an ion channel protein?
A)no signal peptide
B)an amino terminal signal peptide
C)an internal signal peptide
D)a signal anchor peptide

Question

Quizplus · Accepted Answer

Ion channel proteins are membrane proteins that span the lipid bilayer of the cell membrane. Therefore, it is likely that they would have a signal anchor peptide, which is a type of signal sequence that directs proteins to the cell membrane.

During the Translation of MRNA Molecules, the New Polypeptides Are