Multiple Choice
Which of these is a nucleotide?
34. Nucleic Acids
Naming Nucleosides and Nucleotides
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What is the primary structural difference between a nucleoside and a nucleotide?
A
A nucleotide contains a phosphate group, while a nucleoside does not.
B
A nucleoside contains a ribose sugar, while a nucleotide contains a deoxyribose sugar.
C
A nucleotide contains a nitrogenous base, while a nucleoside does not.
D
A nucleoside contains a phosphate group, while a nucleotide does not.
Verified step by step guidance1
Understand the basic components of nucleosides and nucleotides. A nucleoside consists of a nitrogenous base attached to a sugar molecule (either ribose or deoxyribose).
Recognize that a nucleotide is essentially a nucleoside with one or more phosphate groups attached to the sugar molecule.
Identify the structural difference: the presence of the phosphate group in nucleotides, which is absent in nucleosides.
Clarify that both nucleosides and nucleotides contain a nitrogenous base and a sugar, but only nucleotides have the additional phosphate group.
Conclude that the primary structural difference is the presence of the phosphate group in nucleotides, which is not found in nucleosides.
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