1. Give the sequence of the tripeptide using the ONE-LETTER DESIGNATION (UPPERCASE LETTER) with NO spaces and symbols between each letter. 2. How many ionizable groups are there in the tripeptide? Give the numerical value (e.g., 10 not ten). 3. Which amino acid residue has one ionizable group left upon forming the tripeptide? {Choices: AA 1, AA2, AA3, none, all} 4. Give the net charge of the dominant structure of the tripeptide at the given pH values. The pK, values of the amino acids are given in Table 1. o pH 4: {Choices: -2, -1, 0, +1, +2} pH 10: {Choices: -2, -1, 0, +1, +2}

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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Consider the structure of the tripeptide (in its fully protonated
form) below.
HO
|||
HO
H₂N-C-C-N-C-C-N-C-C-OH
CH₂
CH₂
S
CH3
AA1
H
(CH₂)3
1
NH
CÁNH,
NH₂
AA2
H O
I
11
-
H CH-CH3
CH3
AA3
Amino acid
Gly
Ala
Val
Leu
Ile
Pro
Phe
Tyr
Trp
Ser
Cys
Met
Asn
Gln
Asp
Glu
Lys
Arg
Table 1. pk, values of the standard amino acids.
PK₁1
(a-carboxyl)
2.34
2.34
2.32
2.36
2.36
1.99
1.83
2.20
2.38
2.21
2.11
1.96
2.28
2.02
1.88
2.17
1.82
pK₂2
(protonated c-amino)
9.60
9.69
9.62
9.60
9.68
10.96
9.13
9.39
9.15
9.62
10.28
9.21
8.80
9.13
9.60
9.67
8.95
9.04
9.17
pk
(side chain)
10.07
8.18
3.65
10.53
12.48
6.00
Transcribed Image Text:Consider the structure of the tripeptide (in its fully protonated form) below. HO ||| HO H₂N-C-C-N-C-C-N-C-C-OH CH₂ CH₂ S CH3 AA1 H (CH₂)3 1 NH CÁNH, NH₂ AA2 H O I 11 - H CH-CH3 CH3 AA3 Amino acid Gly Ala Val Leu Ile Pro Phe Tyr Trp Ser Cys Met Asn Gln Asp Glu Lys Arg Table 1. pk, values of the standard amino acids. PK₁1 (a-carboxyl) 2.34 2.34 2.32 2.36 2.36 1.99 1.83 2.20 2.38 2.21 2.11 1.96 2.28 2.02 1.88 2.17 1.82 pK₂2 (protonated c-amino) 9.60 9.69 9.62 9.60 9.68 10.96 9.13 9.39 9.15 9.62 10.28 9.21 8.80 9.13 9.60 9.67 8.95 9.04 9.17 pk (side chain) 10.07 8.18 3.65 10.53 12.48 6.00
1. Give the sequence of the tripeptide using the ONE-LETTER
DESIGNATION (UPPERCASE LETTER) with NO spaces and
symbols between each letter.
2. How many ionizable groups are there in the tripeptide? Give
the numerical value (e.g., 10 not ten).
3. Which amino acid residue has one ionizable group left upon
forming the tripeptide? {Choices: AA1, AA2, AA3, none, all}
4. Give the net charge of the dominant structure of the
tripeptide at the given pH values. The pK, values of the amino
acids are given in Table 1.
pH 4: (Choices: -2, -1, 0, +1, +2}
#
pH 10: (Choices: -2, -1, 0, +1, +2}
Transcribed Image Text:1. Give the sequence of the tripeptide using the ONE-LETTER DESIGNATION (UPPERCASE LETTER) with NO spaces and symbols between each letter. 2. How many ionizable groups are there in the tripeptide? Give the numerical value (e.g., 10 not ten). 3. Which amino acid residue has one ionizable group left upon forming the tripeptide? {Choices: AA1, AA2, AA3, none, all} 4. Give the net charge of the dominant structure of the tripeptide at the given pH values. The pK, values of the amino acids are given in Table 1. pH 4: (Choices: -2, -1, 0, +1, +2} # pH 10: (Choices: -2, -1, 0, +1, +2}
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