This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
[{'content': 'An amino acid which does not paicipate in alpha helix formation is \nSelect and explain. \nA. Leucine, B. Glycine, C. Proline, D. Lysine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The stability of a helix arises primarily from hydrogen bonds formed between the oxygen of the peptide bond carbonyl and the hydrogen atom of the peptide bond nitrogen of the fouh residue down the polypeptide chain.Since the peptide bond nitrogen of proline lacks a hydrogen atom, it is incapable of forming a hydrogen bond with a carbonyl oxygen.Harper 30th edition pg: 38', 'role': 'assistant'}]