BIOLOGY
AMINO ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Tryptophan
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Lysine
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Methionine
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Proline
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Detailed explanation-1: -Substitutions: Lysine is a positively charged, polar amino acid.
Detailed explanation-2: -Nonpolar amino acids include alanine (Ala), leucine (Leu), isoleucine (Ile), proline (Pro), tryptophan (Trp), valine (Val), phenylalanine (Phe), and methionine (Met).
Detailed explanation-3: -The polar amino acids include: arginine, asparagine, aspartic acid (or aspartate), glutamine, glutamic acid (or glutamate), histidine, lysine, serine, and threonine. Polar side chains contain groups that are either charged at physiological pH or groups that are able to participate in hydrogen bonding.
Detailed explanation-4: -Lysine and arginine are basic amino acids because their side chain group contains a full positive charge at the physiological pH.