Many integral membrane proteins have one or more \"membrane-spanning\" alpha hel

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Many integral membrane proteins have one or more "membrane-spanning" alpha helices which start on one face of the plasma membrane and extend straight through the membrane to the other side. In some cases, the antigen receptor on T lymphocytes, the membrane is spanned by a single helix, and in others, like the B-adrenergic receptor on neural cells, a protein may have several helices running back and forth across the membrane. Envision the different environments that a membrane-spanning helix runs through. Consider the impact this will have on amino acid composition in the helix _______ that you would expect to find in the mid-section of such a helix, the part that is in the middle of the lipid bilayer while ________ would expect to find at one end of the membrane spanning segment as it passes by the that you phospholipid head groups. Amino acids: L, F, or W; amino acids: R or K, but not D and E Amino acids: L, P, or W: amino acids: R or K, but not D and E Amino acids: L, F, or W; amino acids: R, K, D, or E Amino acids: L, P, or W; amino acids: R, K, D, or E Your answer________

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(c) Amino acid: L,P or W:amino acid:R or K but not D and E

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