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Question

Which of the following is/are correct for Watson-Crick model of DNA structure?

A
DNA is a double stranded helical structure.
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B
The two strands of DNA are anti-parallel.
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C
The two strands of DNA are parallel.
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D
The pitch is 34 A° containing 10 base pairs.
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Solution

The correct option is D The pitch is 34 A° containing 10 base pairs.
Watson-Crick model of DNA structure is the B type DNA. It suggested that:
  • DNA is a double stranded helical structure.
  • The two strands of DNA are anti-parallel.
  • The two strands are complementary to each other i.e., A pairs with T and G pairs with C.
  • The full turn of helical strand (pitch) is 34 A° containing 10 base pairs.

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