16: Amino Acids, Proteins, and Enzymes serine? 16.5 Draw the structure for each of the following amino acids at physiological pH: a. glycine b. T c. glutamate d. Phe 16.6 Draw the structure for each of the following amino acids at physiological pH: a. lysine b. proline c. V d. Tyr 16.7 Classify each of the amino acids in problem 16.5 as polar or nonpolar. If polar, indicate if the R group is neutral, acidic, or basic. Indicate if each is hydrophobic or hydrophilic. 16.8 Classify each of the amino acids in problem 16.6 as polar or nonpolar. If polar, indicate if the R group is neutral, acidic, or basic. Indicate if each is hydrophobic or hydrophilic. 16.9 Give the name for the amino acid represented by each of the following abbreviations: a. Ala b. Q c. K 552 口

3. How is the following amino acid classified? H2N-CHC-OH CH2 C=0 ОН a. nonpolar b. polar neutral c. polar acidic d. polar basic

Name each peptide using both the one-letter and the three-letter abbreviations for the names of the component amino acids.

The isoelectric point (p) of the following amino acid is determined to be 5.97. H2N. OH Which of the following is the dominant form at pH 6.5? Select one: H2N. OH H,N H,N 10

4. How is the following amino acid classified? H3Ñ-CHC-o CH2 a. nonpolar b. polar neutral c. polar acidic d. polar basic

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9) A COOH H₂N-C-H CH₂ CH₂ CH₂ CH₂ NH₂ 2.18 Coo H₂N-C-H CH₂ CH₂ CH₂ 8.95 Coo HN-C-H CH₂ CH₂ CH₂ 1 CH₂ NH₂ 16.53 What is this amino acid and the pl? a) This is arginine and the pl is 8.50 b) This is glutamine and the pl is 5.57 c) This is arginine and the pl is 9.62 Coo H₂N-C-H CH₂ 1 CH₂ CH₂ CH₂ NH₂

Choose from A-F. Two of this amino acid can react with each other (anoxidation reaction) and form a covalent bond. CO- COO COO H3N-C-H H,N-C-H CH2 H2N CH 2 Н-С—он CH2 H2C CH2 CH3 CH3 Choice "A" Choice "B" Choice "C" Coo H,N-C-H H,N-C-H H3N-C-H CH2 CH2 C=CH NH CH2 C-NH | CH SH C-N H Choice "E" Choice "F" Choice "D"

1. Draw the structure of the amino acid in a) acidic solution at a pH below the isoelectric point b) basic solution at a pH above the isoelectric point HN-CH-C-O CH, T CH CH, CH,

acids Identify which of the following are a-amino acids. CH₁ H₂N-C-COOH a. CH₁ H b. H₂N-C-CH₂-COOH 1 CH, H c. H₂N-CH₂-C-COOH H 1 d. H₂N-C-COOH CH₂CH,