The DNA double helix is shown. Which base pairs are correctly bonded?
AA pairs with T, and G pairs with C
BA pairs with G, and T pairs with C
CA pairs with C, and T pairs with G
DAll bases pair with each other freely
Explanation
In DNA, complementary base pairing is strict: Adenine (A) – Thymine (T) via 2 hydrogen bonds; Guanine (G) – Cytosine (C) via 3 hydrogen bonds.