MHT CET Biology question

What is true about the Watson – Crick model of DNA?

(A)The purine and pyrimidine bases are on the outside of the helix, while the phosphate and deoxyribose units are on the inside
(B)The purine and pyrimidine bases are on the inside of the helix, while the phosphate and deoxyribose units are on the outsideCorrect
(C)The purine and phosphate are on the outside of the helix, while the pyrimidine and deoxyribose units are on the inside
(D)The purine and phosphate are on the inside of the helix, while the pyrimidine and deoxyribose units are on the outside

Answer: (B)

Solution

In the Watson–Crick model the sugar–phosphate backbones lie on the outside and the paired purine and pyrimidine bases are stacked

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Question ID VK-065493