The image below shows aspects of the secondary structure of an important human protein.
Several amino acids are highlighted by a ball and stick representation. A number of non-covalent interactions are also shown.
(Note that atoms are coloured by element, where blue is nitrogen and red is oxygen.)

Which ONE statement below is true?

Question

The image below shows aspects of the secondary structure of an important human protein. 
 Several amino acids are highlighted by a ball and stick representation. A number of non-covalent interactions are also shown. 
 (Note that atoms are coloured by element, where blue is nitrogen and red is oxygen.) 
  
 Which ONE statement below is true?

Accepted Answer

The side-chain nitrogen of a lysine residue is forming a hydrogen bond with a backbone oxygen of an amino acid that is more N-terminal within the α-helix

Answer

The side-chain oxygen of a tyrosine residue is forming a hydrogen bond with a backbone nitrogen of an amino acid that is more N-terminal within the α-helix

Answer

The side-chain nitrogen of a lysine residue is forming a hydrogen bond with a backbone oxygen of an amino acid that is more C-terminal within the α-helix

Answer

The side-chain oxygen of a tyrosine residue is forming a hydrogen bond with a backbone nitrogen of an amino acid that is more C-terminal within the α-helix

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The image below shows aspects of the secondary structure of an important human p...

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