TLS Online TPP Program

#Question id: 169


 An octapeptide composed of four repeating glycylalanyl units has:

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. one free amino group on an alanyl residue.

  2. one free amino group on an alanyl residue and one free carboxyl group on a glycyl residue.

  3. one free amino group on a glycyl residue and one free carboxyl group on an alanyl residue.

  4. two free amino and two free carboxyl groups.