AP BIOLOGY

Detailed explanation-1: -The only part of the nucleotide that changes in a DNA molecule is the nitrogenous base, as this is the only part of the structure that may can vary, with the four DNA bases being cytosine, guanine, adenine, and thymine.

Detailed explanation-2: -Answer and Explanation: The part of the nucleotide that codes the genetic information is the base. Each nucleotide has three components, a sugar, a phosphate group and a base. The sugar in DNA is called deoxyribose.

Detailed explanation-3: -A nucleotide is composed of a nitrogenous base, deoxyribose (five-carbon sugar), and at least one phosphate group. The nitrogenous bases are purines such as adenine (A) and guanine (G), or pyrimidines such as cytosine (C), thymine (T), and uracil (U).

Detailed explanation-4: -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-5: -A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T). In RNA, the base uracil (U) takes the place of thymine.