15 Questions
Which of the following statements about amino acids is true?
Amino acids have diverse physical and chemical properties
What is the common structural feature of most a-amino acids?
The a-carbon has four substituents and is tetrahedral
Which of the following is NOT a common feature of all amino acids (except proline)?
An a-hydrogen connected to the a-carbon
What is the relationship between L/D and the configuration of amino acids?
L/D represent the relative configuration of amino acids to L- and D-glyceraldehyde
What is the average molecular weight of an amino acid residue?
About 110
Which of the following is true about peptides and proteins?
Peptides are kinetically stable.
What is the typical duration a peptide bond would last in an aqueous environment in the absence of a catalyst?
More than 1,000 years
Which of the following contributes to the isoelectric point (pI) of a peptide or protein?
Both the terminal amino and carboxyl groups
Which of the following is an example of a conjugated protein?
Hemoglobin
What is commonly used for preparative separation of proteins?
Chromatography
Which of the following statements is true about amino acids with uncharged side chains?
They can act as buffers in solution.
Which of the following is true about the ionization of amino acids?
At neutral pH, the amino group is protonated and the carboxyl group is deprotonated.
Which of the following is true about the isoelectric point (pI) of amino acids?
It is the pH at which amino acids carry a net charge of zero.
Which of the following is true about ionizable side chains in amino acids?
They can show up in titration curves.
What is the general calculation for determining the pI (isoelectric point) when the side chain of an amino acid is ionizable?
Identify the species that carries a net zero charge and take the average of its pKa values.
Test your knowledge on amino acids, peptides, and proteins with this quiz based on Marc A. Ilies' book "Lehninger - Chapter 3." Challenge yourself with questions about the building blocks of proteins and their role in cellular processes.
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