Key Concepts: Genetic Code, Chromosomes, DNA, Cell Cycle
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Genetic Code
- Each codon or triplet codes for a specific amino acid.
- It is degenerate: Amino acids can be coded by more than one codon or triplet (some triplets are synonyms). There are 64 codons for 20 amino acids.
- It is not ambiguous: Each codon encodes only one type of amino acid.
- It is universal: Apart from a few small exceptions.
- There are triplets that determine the beginning of translation ('start codon'): AUG (It codes for the amino acid methionine - Met).
- There are triplets that determine the end of translation ('termination' or 'stop' codons): UAA, UAG, UGA (They do not code for any amino acids).
Chromosomes
They are stick-shaped structures that arise from the condensation and packaging of chromatin during the division phases (mitosis and... Continue reading "Key Concepts: Genetic Code, Chromosomes, DNA, Cell Cycle" »