Codons are three-nucleotide groupings that cells read to decode mRNAs
Codons are three-nucleotide groupings that are read by cells to decode mRNA. Codon characteristics include the following:
In most codons, an amino acid is specified.
A protein ends with three "stop" codons.
AUG, a single "start" codon, denotes the start of a protein and also codes for the amino acid methionine.
An mRNA's codons are read one at a time during translation, starting with the start codon and ending with the stop codon. From N-terminus (methionine) to C-terminus, mRNA codons are read from 5' to 3' and dictate the amino acid sequence of a protein. One more notion, reading frame, is required to reliably translate an mRNA into a protein. How the mRNA sequence is broken up into segments depends on reading frame.
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