16. While examining the crystal structure of a membrane protein, you find several phospholipid molecules bound to the protein. You know that these lipids .
(1) are thought to help stabilize many membrane proteins.
(2) may enhance the crystallization of the bound membrane proteins.
(3) interact specifically with the protein.
(4) can have head groups of various sizes and charges depending on the protein.
(A) 1,2 and 3
(B) 2,3 and 4
(C) 1, 3 and 4
(D) 1 only
(E) All
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