Amino Acids and Their Properties

What is the isoelectric point (pI) of Alanine? (Select the closest value)

The pKa of the carboxyl group (R’COOH) of an amino acid is always higher than the pKa of the amino group (R’NH3+).

What are the two dissociating groups in alanine?

The isoelectric pH (pI) of an amino acid is the pH at which the molecule carries no _____ electrical charge.

Match the following terms with their corresponding descriptions:

All standard amino acids are alpha amino acids except for proline, which is an imino acid.

What is the main structural difference between proline and other standard amino acids?

What is the name of the group that distinguishes one amino acid from another?

The side chain of proline is bonded to both the ______ carbon atom and the amino nitrogen atom, creating a cyclic structure.

Match the following terms to their definitions:

What is the isoelectric point (pI) of an amino acid?

The pI for aspartic acid is calculated by averaging the pKa values closest to each other.

Which of the following amino acids has an imine group in its side chain?

Match the following amino acids with their corresponding pI values:

Which of the following is NOT a general characteristic of amino acids?

All amino acids are chiral.

What is the name of the group that varies between different amino acids?

The amino acid ______ is the only non-chiral amino acid.

Match the following amino acid classifications with their corresponding R group properties:

Which of these amino acids is classified as an imino acid?

Essential amino acids are more important to life than non-essential amino acids.

What is the primary reason why essential amino acids need to be obtained through diet?

Excess amino acids are catabolized to ______, which can be used as sources of energy or for biosynthesis.

Which of these amino acids is classified as exclusively ketogenic?

Glycogenic amino acids are converted to pyruvate or other citric acid cycle intermediates.

What is the name of the molecule that carries both a positive and negative charge but has a net charge of zero?

The ______ is the pH at which an amino acid solution has no net charge.

In an acidic solution, which species of an amino acid predominates?

At the isoelectric point, the amino acid is present almost entirely in its zwitterion form.

What is the isoelectric point (pI) of Histidine?

Lysine is a non-essential amino acid.

What is the pI of Glutamic Acid?

The isoelectric point (pI) is calculated using the formula pI = (pKa + pKa) / 2, resulting in a pI of _____ for Lysine.

Match the following amino acids with their classification:

Which amino acids are classified as ketogenic?

All amino acids are zwitterionic in nature.

In a basic solution, all acid groups are deprotonated to form ______.

Match the descriptions of amino acids to their classifications:

What occurs at the isoelectric point of an amino acid solution?

In an acidic solution, all basic groups of amino acids are deprotonated.

What is the formula used to calculate the isoelectric point (pI)?