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Multiple Choice
Which of the following are the three components that make up a nucleotide?
A
A nitrogenous base, a phosphate group, and a hexose sugar
B
A nitrogenous base, a phosphate group, and a pentose sugar
C
A phosphate group, a carboxyl group, and a pentose sugar
D
A nitrogenous base, a carboxyl group, and a hexose sugar
Verified step by step guidance
1
Identify the basic structure of a nucleotide, which is a fundamental unit of nucleic acids like DNA and RNA.
Understand that a nucleotide is composed of three main components: a nitrogenous base, a phosphate group, and a sugar.
Recognize that the sugar in a nucleotide is a pentose sugar, which means it has five carbon atoms. Common examples are ribose in RNA and deoxyribose in DNA.
Eliminate options that do not include a pentose sugar, as a hexose sugar (six carbon atoms) is not part of a nucleotide structure.
Confirm that the correct components of a nucleotide are a nitrogenous base, a phosphate group, and a pentose sugar, matching the correct answer provided.