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Exam 3: Amino Acids and Peptides

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Question 1

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Which amino acid has the one-letter symbol E?

A) lysine
B) phenylalanine
C) histidine
D) glutamic acid

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Question 2

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The side chain groups of amino acids are bonded to which carbon?

A) The α-carbon.
B) The β-carbon.
C) The carbonyl carbon.
D) Different amino acids have their side chains attached to different carbons.

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Question 3

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Which of the following is NOT a correct combination of an amino acid, its three-letter designation, and its one-letter designation?

$\begin{array}{l}\text { Exhibit } \mathbf { 3 A } \text { (for this chapter) }\\\begin{array} { l l l l } \text { Amino acid } & \boldsymbol { \alpha } \text {-carboxyl group pK a } & \boldsymbol { \alpha } \text {-amino group pK a } & \text { R-group pK } \\\hline \text { Ala } & 2.3 & 9.7 & \\\text { Arg } & 2.2 & 9.0 & 12.5 \\\text { Asn or Gln } & 2.1 & 9.0 & 4.0 \\\text { Asp or Glu } & 2.2 & 9.8 & 8.3 \\\text { Cys } & 1.7 & 10.8 & 6.0 \\\text { His } & 1.8 & 9.2 & \\\text { Ser } & 2.2 & 9.2 & 10.1\end{array}\end{array}$ -Refer to Exhibit 3A. Which one has the R-group with the highest pK?

Which of the following correctly describes peptide bonds?

Which group consists only of amino acids with polar side chains?

Which statement is true about the classification of amino acids?

Exhibit 3B A titration curve. -Refer to Exhibit 3B. The amino acid depicted by the titration curve is

How many possible tetrapeptides can be made using all four of the amino acids D, W, F, and R?

Which is the correct one-letter designation for tryptophan?

Which amino acid has a polar, non-ionic R-group

What is the predominant form of the amino acid abbreviated val at pH 7?

At its isolectric pH, glycine will have

What is the predominant form of the amino acid abbreviated E at pH 7?

$\begin{array}{l}\text { Exhibit } \mathbf { 3 A } \text { (for this chapter) }\\\begin{array} { l l l l } \text { Amino acid } & \boldsymbol { \alpha } \text {-carboxyl group pK a } & \boldsymbol { \alpha } \text {-amino group pK a } & \text { R-group pK } \\\hline \text { Ala } & 2.3 & 9.7 & \\\text { Arg } & 2.2 & 9.0 & 12.5 \\\text { Asn or Gln } & 2.1 & 9.0 & 4.0 \\\text { Asp or Glu } & 2.2 & 9.8 & 8.3 \\\text { Cys } & 1.7 & 10.8 & 6.0 \\\text { His } & 1.8 & 9.2 & \\\text { Ser } & 2.2 & 9.2 & 10.1\end{array}\end{array}$ -Refer to Exhibit 3A. Calculate the pI of ASN:

The isoelectric pH of glycine is closest to

Which of the following is true about oxytocin?

$\begin{array}{l}\text { Exhibit } \mathbf { 3 A } \text { (for this chapter) }\\\begin{array} { l l l l } \text { Amino acid } & \boldsymbol { \alpha } \text {-carboxyl group pK a } & \boldsymbol { \alpha } \text {-amino group pK a } & \text { R-group pK } \\\hline \text { Ala } & 2.3 & 9.7 & \\\text { Arg } & 2.2 & 9.0 & 12.5 \\\text { Asn or Gln } & 2.1 & 9.0 & 4.0 \\\text { Asp or Glu } & 2.2 & 9.8 & 8.3 \\\text { Cys } & 1.7 & 10.8 & 6.0 \\\text { His } & 1.8 & 9.2 & \\\text { Ser } & 2.2 & 9.2 & 10.1\end{array}\end{array}$ -Refer to Exhibit 3A. The pI of an amino acid is the pH at which it has a zero net charge. What is the increasing order of isoelectric points (low pH to high) for these three amino acids?

The pK_a values of the amino groups of common amino acids

Which amino acid would likely be least water-soluble at pH 7.0