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Schematic diagram showing the difference between DNA and RNA.

(genetic biology)

Grammar: noun phrase
Definition: one of the two main types of nucleic acid, present in the cells of all living beings, and essential for the synthesis of proteins

Compare DNA.
Example:
1. Francis Crick once stated that "DNA specifies RNA, which specifies proteins".

2. There are different types of RNA, including messenger RNA (mRNA), and transfer RNA (tRNA): mRNA transmits information encoded in DNA, while tRNA uses this information to manufacture proteins.
Alternative Form: ribonucleic acid