Which of the following descriptions best fits the class of molecules known as nucleotides?
A) a nitrogenous base and a phosphate group
B) a nitrogenous base and a sugar
C) a nitrogenous base, a phosphate group, and a sugar
D) a phosphate group and an adenine or uracil
E) a sugar and a purine or pyrimidine

Question

Quizplus · Accepted Answer

Nucleotides are composed of three parts: a nitrogenous base, a phosphate group, and a sugar. The nitrogenous base can be either a purine (adenine or guanine) or a pyrimidine (cytosine, thymine, or uracil). The sugar is usually a pentose sugar, either deoxyribose (in DNA) or ribose (in RNA). Therefore, option C accurately describes the components of nucleotides.

Which of the Following Descriptions Best Fits the Class of Molecules