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Amino Acids

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Questions and Answers

Which of the following statements about amino acids is true?

Amino acids have only acidic properties

Amino acids have only basic properties

Amino acids are linear homopolymers of a-amino acids

Amino acids have diverse physical and chemical properties (correct)

What is the common structural feature of most a-amino acids?

The a-carbon has two substituents and is linear

The a-carbon has four substituents and is tetrahedral (correct)

The a-carbon has five substituents and is trigonal bipyramidal

The a-carbon has three substituents and is planar

Which of the following is NOT a common feature of all amino acids (except proline)?

A fourth substituent (R), unique

A basic amino group

An a-hydrogen connected to the a-carbon (correct)

An acidic carboxyl group

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 Signup and view all the answers

What is the average molecular weight of an amino acid residue?

About 110 Signup and view all the answers

Which of the following is true about peptides and proteins?

Peptides are kinetically stable. Signup and view all the answers

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 Signup and view all the answers

Which of the following contributes to the isoelectric point (pI) of a peptide or protein?

Both the terminal amino and carboxyl groups Signup and view all the answers

Which of the following is an example of a conjugated protein?

Hemoglobin Signup and view all the answers

What is commonly used for preparative separation of proteins?

Chromatography Signup and view all the answers

Which of the following statements is true about amino acids with uncharged side chains?

They can act as buffers in solution. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

Which of the following is true about ionizable side chains in amino acids?

They can show up in titration curves. Signup and view all the answers

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. Signup and view all the answers