NEET 2008 Biology question

In DNA, the complementary bases are

(1)Uracil and adenine; cytosine and guanine
(2)Adenine and thymine; guanine and cytosineCorrect
(3)Adenine and thymine; guanine and uracil
(4)Adenine and guanine; thymine and cytosine

Answer: (2)

Solution

In the double helix of DNA the two polynucleotide chains are held by hydrogen bonds between a purine and a pyrimidine (Chargaff's rule): adenine pairs with thymine through two hydrogen bonds (A=T) and guanine

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Question ID VK-090027