AP BIOLOGY

Detailed explanation-1: -Adenine always bonds with thymine, making them DNA’s other pair of complementary bases. These pairs form the “rungs” of the DNA ladder.

Detailed explanation-2: -Final answer: In DNA the complementary bases are adenine and thymine, guanine, and cytosine.

Detailed explanation-3: -Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .

Detailed explanation-4: -In DNA, adenine always pairs with thymine (A-T), and guanine always pairs with cytosine (G-C).

Detailed explanation-5: -Complementary base pairing is the phenomenon where in DNA guanine always hydrogen bonds to cytosine and adenine always binds to thymine. The bond between guanine and cytosine shares three hydrogen bonds compared to the A-T bond which always shares two hydrogen bonds.