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== Nucleoside vs. Nucleotide ==

Nucleosides and nucleotides are fundamental organic molecules that serve as the monomeric units for nucleic acids like DNA and RNA.<ref name="ref1" /> While structurally similar, the primary distinction between them lies in their chemical composition. A nucleoside consists of a nitrogenous base covalently attached to a pentose sugar (either ribose or deoxyribose).<ref name="ref2" /> A nucleotide, in contrast, is a nucleoside that is bonded to one or more phosphate groups.<ref name="ref3" /><ref name="ref4" />

The nitrogenous bases are classified into two main groups: purines (adenine and guanine), which have a double-ring structure, and pyrimidines (cytosine, thymine, and uracil), which have a single-ring structure.<ref name="ref5" /> The pentose sugar in RNA is ribose, whereas in DNA it is deoxyribose, which lacks a hydroxyl group at the 2' carbon position.

Nucleotides are the building blocks for the synthesis of nucleic acids.<ref name="ref4" /> Beyond their role in genetics, nucleotides are also involved in cellular energy transfer, with adenosine triphosphate (ATP) being a primary example. They also participate in cell signaling and act as cofactors in enzymatic reactions.<ref name="ref2" /> Nucleosides can be converted into nucleotides through a process called phosphorylation, catalyzed by enzymes known as kinases.<ref name="ref4" /><ref name="ref5" /> Certain nucleoside analogs are utilized as antiviral or anticancer agents.<ref name="ref4" />

=== Comparison Table ===
{| class="wikitable"
|-
! Category !! Nucleoside !! Nucleotide
|-
| '''Components''' || A nitrogenous base and a pentose sugar.<ref name="ref2" /> || A nitrogenous base, a pentose sugar, and one or more phosphate groups.<ref name="ref1" />
|-
| '''Phosphate Group''' || Absent.<ref name="ref3" /> || Present.<ref name="ref3" />
|-
| '''Primary Function''' || Precursor for nucleotide synthesis; role in cellular signaling. || Monomer of DNA and RNA; energy currency (e.g., ATP); cell signaling.<ref name="ref2" />
|-
| '''Bonding''' || The base is linked to the sugar via a β-glycosidic bond. <ref name="ref2" />|| The nucleoside is linked to the phosphate group via a phosphoester bond.
|-
| '''Examples''' || Adenosine, guanosine, cytidine, uridine, thymidine. <ref name="ref2" />|| Adenosine monophosphate (AMP), Guanosine triphosphate (GTP), Deoxyadenosine monophosphate (dAMP).
|-
| '''Nomenclature Suffix''' || Purines end in "-osine" (e.g., adenosine), and pyrimidines end in "-idine" (e.g., cytidine). || Named by adding "monophosphate," "diphosphate," or "triphosphate" to the nucleoside name (e.g., adenosine monophosphate).
|}

[[File:Venn_diagram_Differences_between_Nucleoside_versus_Nucleotide_comparison.png|thumb|center|800px|alt=Venn diagram for Differences between Nucleoside and Nucleotide|Venn diagram comparing Differences between Nucleoside and Nucleotide]]

== Nomenclature ==

The naming conventions for nucleosides and nucleotides are systematic. For nucleosides, the suffix of the nitrogenous base's name is changed. If the base is a purine, the "-ine" ending is replaced with "-osine" (e.g., adenine becomes adenosine). If the base is a pyrimidine, the ending becomes "-idine" (e.g., cytosine becomes cytidine).

Nucleotides are named by taking the name of the corresponding nucleoside and adding the appropriate term for the number of phosphate groups attached, such as monophosphate, diphosphate, or triphosphate. For example, the nucleoside adenosine, when bonded to one phosphate group, is called adenosine monophosphate (AMP). If the sugar is deoxyribose, the prefix "deoxy-" is added to the nucleoside's name, as in deoxyadenosine.

== References ==
<references>
<ref name="ref1">[https://en.wikipedia.org/wiki/Nucleotide "wikipedia.org"]. Retrieved November 21, 2025.</ref>
<ref name="ref2">[https://microbenotes.com/nucleic-acids-nucleosides-and-nucleotides/ "microbenotes.com"]. Retrieved November 21, 2025.</ref>
<ref name="ref3">[https://www.vedantu.com/neet/difference-between-nucleotide-and-nucleoside "vedantu.com"]. Retrieved November 21, 2025.</ref>
<ref name="ref4">[https://www.differencebetween.com/difference-between-nucleotide-and-vs-nucleoside/ "differencebetween.com"]. Retrieved November 21, 2025.</ref>
<ref name="ref5">[https://www.abcam.co.jp/knowledge-center/dna-and-rna/nucleosides-and-nucleotides-building-blocks-of-genetic-material "abcam.co.jp"]. Retrieved November 21, 2025.</ref>
</references>

[[Category:Comparisons]]

Differences between Nucleoside and Nucleotide - Revision history

Dwg: Article written and Venn diagram created.