If a protein that functions in cells is a transmembrane protein, the identity of the amino acid residues would be individually similar in nature to the part of the cell membrane that it is enclosed by/adjacent to. This is due to the fact that the residues of the amino acids are usually exposed to its environment, and that polar groups tend to cluster with a polar environment just as nonpolar groups tend to go to the nonpolar environment.
Among the following, which amino acid is least likely to occur in the membrane crossing segments of a protein.
A. leucine (L)
B. leucine (L)
C. isoleucine (I)
D, phenylalanine (F)
E. aspartic acid (D)
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