In alkaline medium,alanine exists predominantly as

Which of the following is $NOT$ a basic amino acid?

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:

An amino acid may be represented by the general formula $H_2N-CH(R)-COOH$. If $R = -CH_2C_6H_5$,it is phenylalanine $(Phe)$,and if $R = -CH_3$,it is alanine $(Ala)$. Identify the correct reagents from the list below to synthesize the dipeptide $Phe-Ala$:
$(1) ZNH-CH(CH_3)-COOH$
$(2) H_2N-CH(CH_3)-COOCH_2C_6H_5$
$(3) ZNH-CH(CH_2C_6H_5)-COOH$
$(4) H_2N-CH(CH_2C_6H_5)-COOCH_2C_6H_5$
(Note: $Z$ represents the benzyloxycarbonyl protecting group).

Which from following is NOT a globular protein?

Which of the following pair of amino acids are obtained during the hydrolysis of aspartame?