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Identify amino acids containing non-polar, aliphatic R groups.

Option: 1

Phenylalanine, tyrosine, and tryptophan

Option: 2

Glycine, alanine, leucine

Option: 3

Histidine, arginine, Lysine 

Option: 4

Serine, Cysteine, Threonine

Answers (1)


The structures of Glycine, Alanine and Leucine are given below:

Glycine: HN+ _ CH 2 _ COO-

Alanine: H3N+ _ CH(CH3)  _ COO-

Leucine: : H3N+ _ CH(C4H9) _ COO-

Hence, the correct answer is option 2.

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