KVPY SB SX Exam 2011 Question Paper

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Question : 78 of 120

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According to the original model of DNA, as proposed by Watson & Crick in 1953. DNA is a

left handed helix
helix that makes a full turn every 70 nm.
helix where one turn of DNA contains 20 basepairs
two stranded helix where each strand has opposite polarity.

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