Which of the following one-letter symbols is used to represent aspartic acid?

The $\alpha-$helix and $\beta-$pleated sheet structures of protein are associated with its:

Which of the following is a Zwitter ion?

For an amino acid,the ionization constant for the carboxyl group is $pK_{a_1} = 2.34$ and for the ammonium ion is $pK_{a_2} = 9.6$. At what $pH$ will the isoelectric point of the amino acid be?

Which functional groups are responsible for the formation of a zwitterion?

In an amino acid,the carboxylic group ionises at $pH = 2.56$ $(pK_{a_1})$ and the ammonium ion ionises at $pH = 9.38$ $(pK_{a_2})$. The isoelectric point of the amino acid is at: