Example$(s)$ of aromatic amino acid is/are:

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).

Haemoglobin is

Explain the types of protein structures based on the provided image.

The following tripeptide structure is composed of three amino acids. Identify the correct sequence of amino acids in the tripeptide:
(Structure: $H_2N-CH(CH_2Ph)-CO-NH-CH(CH_3)-CO-NH-CH(CH_2OH)-COOH$)

The amino acid which is basic in nature is