AP BIOLOGY

Detailed explanation-1: -In DNA, the complementary bases are adenine and guanine; thymine and cytosine. Each nucleotide in DNA is composed of a nitrogen containing base, either guanine (G), adenine (A), thymine (T), or cytosine (C) as well as a monosaccharide sugar called deoxyribose and a phosphate group.

Detailed explanation-2: -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-3: -Whereas, guanine and cytosine are complementary to each other and pair via three hydrogen bonds.

Detailed explanation-4: -What is the complementary base pairing rule for DNA? Complementary base pairs refer to the nitrogenous bases adenine, thymine, cytosine, and guanine.

Detailed explanation-5: -Adenine always binds to thymine, while cytosine and guanine always bind to one another. This relationship is called complementary base paring. These complementary bases are bonded together via hydrogen bonds, which can be easily broken apart when the DNA needs to unzip and duplicate itself.