Each turn of DNA contain ____________ nitrogenous base pairs?
Correct answer: B. 10
- A. 5
- B. 10
- C. 20
- D. 25
Explanation
In the common B-form of DNA, one complete turn of the double helix contains about 10 base pairs. The bases are stacked inside the helix and one base pair is positioned approximately every 0.34 nm along its length. Students may choose c by confusing the number of nucleotides with the number of base pairs, since 10 base pairs contain 20 individual nucleotides.
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About Structure of DNA
DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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