TLS Online TPP Program

#Question id: 169


 An octapeptide composed of four repeating glycylalanyl units has:

#XL - T Zoology
  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.