EAMCET Engineering 2009 Solved Paper

Tripeptides are amino acids polymers in which three individual amino acid units, called residues, are linked together by amide bonds. In these, an amine group from one residue forms an amide bond with the carboxyl group of a second residue, the amino group of the second forms an amide bond with the carboxyl group of the third.
Therefore, glycine (NH2−CH2−COOH), alanine (CH3−

CH |

NH2

−COOH) and phenyl alanine
C6H5−CH2−

C |

NH2

‌HCOOH can be linked in six different ways.