Which of the following amino acids can participate in the formation of a disulfide bridge?

Consider L-glutamate, which is shown below.

Using the pKa information provided, what is the isoelectric point (pI) of the given molecule?

What is the D/L configuration and the absolute (R/S) configuration of the following amino acid (cysteine)?

Consider the amino acid L-lysine, shown below.

Given the pKa values shown, calculate the pI of lysine.

Treatment of a peptide with Edman's reagent yielded the following phenylthiohydantoin (PTH) derivative:

What is the side chain of the amino acid at the N-terminus of the peptide?

What is the amino acid that is synthesized from the malonic ester synthesis shown?

How many essential amino acids are there?

Which of the following amino acids is the only one to contain a side chain that results in an achiral amino acid?

Which of the following is an example of a basic amino acid?