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In DNA, Adenine (A) pairs with Thymine (T) via:

AThree hydrogen bonds (most stable pair)
BTwo hydrogen bonds
CFour hydrogen bonds (most stable pair)
DOne hydrogen bond (least stable pair)
Answer & Solution
Correct answer: B. Two hydrogen bonds
A-T pair has 2 hydrogen bonds; G-C pair has 3 hydrogen bonds. G-C regions are therefore more thermally stable than A-T regions.
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