Amino Acids

Which of the statements about 'denaturation' given below are correct?

Statements:

($\mathrm{i}$) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.

($\mathrm{ii}$) Denaturation leads to the conversion of double strand of $\mathrm{DNA}$ into single strand.

($\mathrm{iii}$) Denaturation affects the primary structure, which gets destroyed.

The dipeptide Gly-Ala has which of the following structures?

A reagent suitable for the determination of $\mathrm{N}-$terminal residue of a peptide is

Which one of the following statements is correct?

The secondary structure of a protein refers to

Lack of essential amino acids in the diet leads to the disease called

Amino acids are the building blocks of

Which of the following amino acids is achiral?

Which of the following compounds in an imino acid? 

Which of the following is not an amino acid?

The number of essential amino acids in man are.