MCAT Question of the Day
    •

    Q:

    		 The R groups of the amino acids in α-helices ρ are directed outward from the helix, interacting with the surrounding space. The primary difference between a transmembrane alpha helix and a cytosolic alpha helix would be
    		 

    A

    		 an abundance of nonpolar amino acids on the transmembrane helix versus an abundance of polar amino acids on the cytosolic helix.

    B

    		 the presence of disulfides on the transmembrane helix but not on the cytosolic helix.

    C

    		 long helices for transmembrane proteins and short helices for cytosolic proteins.

    D

    		 a tighter turning radius for helices in transmembrane proteins than in cytosolic proteins.



    Protein Structure and Function |
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