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JEE Main levelOne or more correct optionsDifficulty 2 of 3bm154

Select the correct statements about the DNA double helix.

  1. AThe two strands run antiparallel.
  2. BGuanine and cytosine are joined by three hydrogen bonds.
  3. CThe nitrogenous bases lie on the outside and the sugar-phosphate backbone lies inside.
  4. DThymine pairs with guanine.

Answer: A, B

The strands are antiparallel and G-C has three H bonds. The bases lie inside, stacked, and the sugar-phosphate backbone is outside. Thymine pairs with adenine.
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