The double helical structure of DNA was proposed by ___________.

Anton van Leeuwenhoek

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Schleiden and Schwann

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Alexander Fleming

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Watson and Crick

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Solution

The correct option is D Watson and Crick
Double helical structure of DNA was proposed by James Watson and Francis Crick in 1953. According to them the DNA molecule consists of two strands of a chain of nucleotides which wound around each other like a twisted ladder.

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