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The genetic code defines how codons in DNA/RNA sequences are translated into amino acids during protein synthesis.
The genetic code is the set of rules that living cells use to translate genetic information stored in DNA or RNA into proteins. In this process, the ribosome reads nucleotide triplets (codons) on messenger RNA (mRNA) in groups of three bases, while transfer RNA (tRNA) molecules bring specific amino acids. The codons determine the order of amino acids added during protein biosynthesis, thereby specifying the protein’s primary structure. The genetic code is highly similar across organisms and is commonly represented by a standard table with 64 codons (4^3 combinations). In most cases, each three-nucleotide codon specifies a single amino acid, with a few codons acting as stop (termination) signals that end translation. Although the canonical genetic code is widely used, variant genetic codes exist in some organisms and cellular compartments (for example, in mitochondria), reflecting exceptions to the standard mapping.
The genetic code defines how codons in DNA/RNA sequences are translated into amino acids during protein synthesis.
Translation is performed by the ribosome using tRNA to match codons to specific amino acids, reading mRNA three nucleotides at a time.
The standard genetic code is largely universal and can be summarized with 64 codons, with most codons specifying amino acids and some serving as stop signals.
Variant genetic codes occur in certain organisms or organelles, such as mitochondria, where codon-to-amino-acid assignments can differ.
The genetic code is the set of rules that translates nucleotide triplets (codons) in DNA/RNA into the amino-acid sequence of proteins.
A codon is a sequence of three nucleotides on mRNA that specifies an amino acid or a translation stop signal.
mRNA is the RNA molecule that carries genetic information to the ribosome for protein synthesis.
tRNA is an RNA molecule that delivers a specific amino acid to the ribosome and pairs with codons on mRNA.
The ribosome is the cellular machine that reads mRNA codons and links amino acids into a growing polypeptide chain.
A start codon is the codon that initiates translation, most commonly AUG (which codes for methionine or formylmethionine depending on the organism).
A stop codon is a codon (such as UAA, UAG, or UGA) that signals termination of translation by preventing tRNA binding and triggering release of the completed polypeptide.
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