Draw the possible dipeptide, where −NH2 group of serine is free, formed by the condensation reaction between serine and lysine.

Answer 1

The dipeptide formed by the condensation reaction between serine and lysine is Serine-Lysine or Ser-Lys. The chemical structure is:

HOOC-CH(NH2)-CH2-OH + H2N-(CH2)4-CH(NH2)-COOH → HOOC-CH(NH-CH2-CH2-NH-C-(CH2)4-CH(NH2)-COOH + H2O

In simpler terms, the carboxyl group of serine (HOOC) combines with the amine group of lysine (H2N) with the loss of a water molecule, forming a peptide bond (-CO-NH-). The resulting dipeptide has the amino acid sequence Ser-Lys, where the −NH2 group of serine remains free.