How many spirals (twins or helices) a DNA of 2000 base pairs will have?

2000

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4000

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200

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45.5

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Solution

The correct option is D 200
Each turn of DNA helix is made up of 10 base pairs. If a DNA has 2000 base pairs then the number of spirals = 2000 (number of base pairs) ÷10 (number of base pairs for one helix) =200 spirals.
So, the correct answer is '200'.

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