Question

unit 1 cumulative test (characteristics of life, biomolecules, cell structure and transpo
22 of 42
possible points: 2
the parts of a nucleotide are
∘ carbon, hydrogen, oxygen
∘ amino, carboxyl, side chain
∘ sugar, ribose, deoxyribose
∘ nitrogen base, phosphate, sugar

Explanation:

To determine the parts of a nucleotide, we analyze each option:

• Option 1: Carbon, hydrogen, oxygen are elements, not the specific parts of a nucleotide.
• Option 2: Amino, carboxyl, side chain are parts of an amino acid, not a nucleotide.
• Option 3: Ribose and deoxyribose are types of sugar in nucleotides, but this option incorrectly lists them with "sugar" (it should be one type of sugar along with phosphate and nitrogen base).
• Option 4: A nucleotide is composed of a nitrogen base, a phosphate group, and a sugar (ribose in RNA, deoxyribose in DNA). This matches the structure of a nucleotide.

Answer:

D. Nitrogen base, phosphate, sugar