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WorksheetsTopic 2: Amino acids and Peptides
Total questions: 13
Worksheet time: 8mins
Which of the following amino acids has a side chain with a pKa around 4.1?
Lysine
Aspartic acid
Histidine
Arginine
What is the isoelectric point for the amino acid Tryptophan?
pKa1 = 2.38
pKa2 = 9.39
2.38
7.07
5.89
9.39
Which amino acid has a molecular weight of approximately 89 Da?
Glycine
Alanine
Serine
Valine
What is the correct ionization state of histidine at pH = 1?
-1
0
+1
+2
Which amino acid is most likely to be found in the interior of a protein due to its hydrophobic nature?
Glutamine
Leucine
Serine
Lysine
What is the reaction that describes the formation of a peptide bond?
Hydrolysis
Condensation
Oxidation
Reduction
Which amino acid has a side chain that can form disulfide bonds?
Methionine
Cysteine
Proline
Histidine
Which of the following amino acids has a basic side chain?
Glutamic acid
Arginine
Asparagine
Phenylalanine
This is the structure of GABA.
Is GABA an amino acid?
Yes
No
Maybe
I’m not sure
Which of the following is a characteristic feature of the amino acid proline that distinguishes it from other standard amino acids?
It contains a sulphur atom in its side chain.
It has a secondary amine group.
It is the only amino acid with a hydroxyl group in its side chain.
It has an aromatic ring in its side chain.
Which of the following conditions would most likely destabilise a disulfide bond in a protein?
High pH
Reducing environment
High temperature
Oxidising environment
The Henderson-Hasselbalch equation can be used to determine the pH of a buffer solution. If the concentration of the conjugate base is twice that of the weak acid, what is the pH relative to the pKa?
pH=pKa−1
pH=pKa+log10 0.5
pH=pKa
pH=pKa+log10 2
In electrophoresis, which factor most determines the migration rate of an amino acid in a gel?
The molecular weight of the amino acid
The net charge of the amino acid
The hydrophobicity of the amino acid
The presence of disulfide bonds in the amino acid
