A) 4,500
B) 45,000
C) 45
D) 450
Correct Answer: A
Solution :
According to, Watson and Cricks DNA model, DNA exists as double helix in which two polynucleotide chains are coiled about one another in a spiral way (a right handed spiral). The base pairs in DNA are stacked \[\text{3}\text{.4{ }\!\!\mathrm{\AA}\!\!\text{ }}\]apart with 10 base pair in a turn (\[360{}^\circ \]) of the double helix. Therefore, if the length of DNA has 45,000 base pairs. DNA molecule will take 4,500 complete turns.
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