Short answer
RNA names a broad family of nucleic-acid molecules. Messenger RNA, or mRNA, is one type: it carries the sequence used by cellular machinery to build a protein. Every mRNA is RNA, but not every RNA is a messenger. 1 2
mRNA is one kind of RNA, alongside ribosomal, transfer and other RNAs.
On this page
At a glance
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| Question | RNA | mRNA |
|---|---|---|
| Category | Broad molecular family | One RNA subtype |
| Typical roles | Information, structure, regulation and more | Carries protein-coding instructions |
| Example | rRNA, tRNA or mRNA | A transcript read by a ribosome |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
RNA. Ribonucleic acid: a nucleic-acid molecule that can carry out several roles in cells. 1
mRNA. Messenger RNA: an RNA molecule that conveys protein-coding information to the translation machinery. 2
Key differences
The distinction is functional rather than a different basic chemical class. RNA typically has ribose and the base uracil. The messenger subtype is transcribed from a DNA template and its codons can be translated into amino acids. Transfer RNA and ribosomal RNA take different roles in that same protein-making process. 1 2
How to tell them apart
If a statement refers to any RNA molecule or to properties shared across RNA types, use RNA. If it refers to the transcript that carries coding information for translation, use mRNA. Ask whether “messenger” describes the molecule’s job, not merely whether it was made from DNA. 1 2
Where they overlap
Both can be single-stranded nucleic-acid molecules and can be produced through transcription. mRNA relies on other RNA types as part of the translation machinery. 1 2
Edge cases
Some RNAs regulate genes or act as functional products without coding for a protein. Some viruses use RNA as their genetic material. In a technical context, an mRNA can include regions that are not translated; “messenger” does not imply that every nucleotide encodes an amino acid. 1 2
Why the distinction exists
Researchers name RNA subtypes because chemically related molecules perform different jobs. The added m narrows the broad material category to its protein-message role. 1 2
Common misconceptions
RNA is not simply short for mRNA. Discussions of rRNA, tRNA or regulatory RNAs are about RNA but not messenger RNA. 1 2
Examples
A cell makes an mRNA transcript from a gene and a ribosome reads it. The ribosome itself contains rRNA; both molecules are RNA, but only the first is mRNA. 1 2
Sources
Sources checked October 3, 2026.