How do DNA and RNA differ in their bases and roles?

DNA and RNA are essential nucleic acids that differ in their chemical composition, structure, and biological roles.12

Chemical and Structural Differences

• Sugars: DNA contains the sugar deoxyribose, while RNA contains ribose.12
• Bases: Both molecules use adenine, guanine, and cytosine. However, DNA uses thymine, whereas RNA replaces it with uracil.12
• Structure: DNA typically exists as a double-stranded helix, providing stability for genetic storage. RNA is generally single-stranded and more chemically reactive, often folding into complex three-dimensional shapes.132

Biological Roles

• DNA: Acts as the master blueprint for life, storing the hereditary information for all free-living organisms.12
• RNA: Primarily functions to translate the genetic code from DNA into proteins synthesized within the cell. RNA also serves as the genetic material for certain viruses and can act as a biological catalyst, suggesting it may have played a foundational role in the early evolution of life.142