Codons are three-nucleotide sequences in mRNA that specify a particular amino acid.
Here's why this is true:
* Codons are the units of genetic code: They act as "words" in the genetic code, dictating which amino acid should be added to a growing protein chain during translation.
* Each codon specifies one amino acid: There are 64 possible codons (4 bases x 4 bases x 4 bases), but only 20 amino acids. This means that some amino acids are coded for by multiple codons (degeneracy).
* They are found in mRNA: mRNA (messenger RNA) carries the genetic code from DNA to the ribosomes, where protein synthesis occurs. Codons are located within mRNA sequences.
Let me know if you have any other questions about codons!