A tetrapeptide has three peptide bonds:
aa1-aa2 peptide bond.
  aa2-aa3 peptide bond.
  aa3-aa4 peptide bond.

One of the peptide groups is missing an atom. Go back through the peptide bonds again and locate the peptide group that has only 5 atoms. Which atom is missing and why?

  Now you can see if you were right.

  Spacefilling model. The alpha carbons are dark gray. Can you name this peptide?


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