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Multiple Choice
What are the three components of a nucleotide?
A
A phosphate group, a carboxyl group, and a pentose sugar
B
A nitrogenous base, a phosphate group, and a hexose sugar
C
A nitrogenous base, a carboxyl group, and a hexose sugar
D
A nitrogenous base, a phosphate group, and a pentose sugar
Verified step by step guidance
1
Understand that a nucleotide is the basic building block of nucleic acids, such as DNA and RNA.
Recognize that a nucleotide is composed of three main components: a nitrogenous base, a phosphate group, and a sugar.
Identify the sugar component in nucleotides as a pentose sugar, which is a five-carbon sugar. In DNA, this is deoxyribose, and in RNA, it is ribose.
Note that the nitrogenous base can be one of the following: adenine, guanine, cytosine, thymine (in DNA), or uracil (in RNA).
Conclude that the correct components of a nucleotide are a nitrogenous base, a phosphate group, and a pentose sugar, which matches the correct answer provided.