LABORATORY REVIEW
MOLECULAR BIOLOGY
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 Question 
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 Which scientists built a 3-D model of the DNA double helix? 
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  Hershey and Chase 
 
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  Watson and Crick 
 
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  Chargaff and Franklin 
 
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  Griffith and Avery 
 
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 Explanation: 
Detailed explanation-1: -Chargaff’s realization that A = T and C = G, combined with some crucially important X-ray crystallography work by English researchers Rosalind Franklin and Maurice Wilkins, contributed to Watson and Crick’s derivation of the three-dimensional, double-helical model for the structure of DNA.
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