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== DNA vs. RNA ==

Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two primary types of nucleic acids found in living organisms. Both molecules consist of long chains of nucleotides that store and transmit genetic information. While they share several chemical similarities, their structures and biological roles differ significantly. DNA serves as the long-term storage of genetic blueprints in the cell nucleus and mitochondria. RNA functions as a messenger, a structural component of ribosomes, and a catalyst for chemical reactions during protein synthesis.<ref name="Alberts">Alberts B, Johnson A, Lewis J, et al. ''Molecular Biology of the Cell''. 4th edition. New York: Garland Science; 2002. DNA and RNA structure.</ref>

=== Comparison table ===

{| class="wikitable"
|-
! Feature !! DNA (ADN) !! RNA (ARN)
|-
| Full name || Deoxyribonucleic acid || Ribonucleic acid
|-
| Pentose sugar || Deoxyribose || Ribose
|-
| Nitrogenous bases || Adenine, Guanine, Cytosine, Thymine || Adenine, Guanine, Cytosine, Uracil
|-
| Typical structure || Double-stranded helix || Single-stranded (often folded)
|-
| Chemical stability || Highly stable; resistant to hydrolysis || Less stable; prone to alkaline hydrolysis
|-
| Primary location || Nucleus, mitochondria, chloroplasts || Cytoplasm, ribosomes, nucleolus
|-
| Propagation || Self-replicating via DNA polymerase || Synthesized from DNA via transcription
|-
| Ultraviolet sensitivity || High vulnerability to UV damage || Relatively resistant to UV damage
|}

[[File:Venn_Differences_between_ADN-ARN.png|thumb|center|800px|alt=Venn diagram for Differences between ADN-ARN|Venn diagram comparing Differences between ADN-ARN]]

=== Chemical composition ===

The primary difference between DNA and RNA lies in the pentose sugar within the nucleotide backbone. DNA contains deoxyribose, which lacks an oxygen atom on the 2' carbon of the sugar ring. RNA contains ribose, which has a hydroxyl (-OH) group at that position. This hydroxyl group makes RNA more chemically reactive and less stable than DNA over long periods.<ref name="Berg">Berg JM, Tymoczko JL, Stryer L. ''Biochemistry''. 5th edition. New York: W H Freeman; 2002. Section 5.1, Nucleic Acids.</ref>

The nitrogenous bases also vary between the two molecules. Both utilize adenine (A), guanine (G), and cytosine (C). However, DNA uses thymine (T) as its fourth base, while RNA uses uracil (U). Uracil is energetically cheaper for the cell to produce, but it is more prone to mutations. Thymine is a methylated version of uracil that provides greater resistance to photochemical damage, which aids in the preservation of the genetic code in DNA.<ref name="Lehninger">Nelson DL, Cox MM. ''Lehninger Principles of Biochemistry''. 7th edition. W. H. Freeman; 2017.</ref>

=== Structure and function ===

DNA usually exists as a double-stranded molecule where two strands run in opposite directions. These strands form a double helix held together by hydrogen bonds between complementary bases (A with T, and C with G). This structure protects the genetic information by tucking the bases inside the sugar-phosphate backbone.

RNA is typically single-stranded. This lack of a second strand allows RNA to fold into complex three-dimensional shapes. These shapes enable RNA to perform various tasks. Messenger RNA (mRNA) carries the genetic code from DNA to the ribosomes. Transfer RNA (tRNA) carries specific amino acids to the ribosome during protein assembly. Ribosomal RNA (rRNA) forms the core of the ribosome and catalyzes the formation of peptide bonds. Some RNA molecules, known as ribozymes, function as biological enzymes to speed up chemical reactions.<ref name="NHGRI">National Human Genome Research Institute. "RNA (Ribonucleic Acid)". genome.gov.</ref>

== References ==
<references />

[[Category:Comparisons]]

Differences between ADN-ARN - Revision history

Dwg: Article written and Venn diagram created.