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MCAT Question A Day - 5/18/14 - Answer!

During translation, a signal peptide is synthesized and attaches to an SRP complex in order to:

A.  inactivate the new protein.
B.  activate the new protein.
C.  prevent the ribosome from attaching to the endoplasmic reticulum.
D.  direct the ribosome to attach to the endoplasmic reticulum.

D is correct. Signal peptides attach to SRPs to direct the ribosome to attach to a membrane such as the endoplasmireticulum. The signal peptide is usually removed during translation.

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