β-Turns in a Peptide Chain Form a Tight Loop with Hydrogen

question 7

Multiple Choice

β-Turns in a peptide chain form a tight loop with hydrogen bonding of the carbonyl oxygen with:

• A) side chain amine of lysine two amino acids down the chain.
• B) amide proton on the next amino acid down the chain.
• C) amide proton of the glutamine side chain.
• D) amide proton of the residue three positions down the chain.
• E) amide proton of asparagine side chain.

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