Use this information to answer the following questions.
A major group of G protein-coupled receptors contains seven transmembrane α helices. The amino end of the protein lies at the exterior of the plasma membrane. Loops of amino acids connect the helices either at the exterior face or on the cytosol face of the membrane. The loop on the cytosol side between helices 5 and 6 is usually substantially longer than the others.
-Where would you expect to find the carboxyl end?
A)at the exterior surface
B)at the cytosol surface
C)connected with the loop at H5 and H6
D)between the membrane layers
E)there is no carboxyl end in proteins

Question

Quizplus · Accepted Answer

The amino end of the protein is located at the exterior of the plasma membrane, so the carboxyl end would be expected to be located at the cytosol surface of the membrane.

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