Problem: 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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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.

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Problem Details

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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