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#Question id: 669


Ramachandran determined the ʺallowedʺ values of the phi and psi angles primarily by considering ________.

#1. Molecules and their Interaction Relevant to Biology
  1. pKa values of the amino acids 

  2. the hydropathy of amino acids

  3. steric hindrance    

  4. hydrogen bonding effects


Answer:- Option(s): 3


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