* Codons: Codons are three-nucleotide sequences within mRNA.
* Amino acids: The building blocks of proteins.
The Genetic Code: The relationship between codons and amino acids is called the genetic code. It's like a dictionary that translates the language of nucleotides in mRNA into the language of amino acids in proteins.
Important Points:
* Redundancy: The genetic code is redundant, meaning multiple codons can code for the same amino acid. This provides some protection against mutations.
* Start and Stop Codons: There are special codons that signal the start and stop of protein synthesis.
* Start codon: AUG (codes for methionine)
* Stop codons: UAA, UAG, UGA
* Universality: The genetic code is nearly universal, meaning it's the same in all living organisms (with a few minor exceptions).
Example:
The codon UAC specifies the amino acid tyrosine.
How to Use a Codon Table:
1. Find the first nucleotide of the codon on the left side of the table.
2. Find the second nucleotide along the top of the table.
3. Find the third nucleotide on the right side of the table.
4. The intersection of these three rows and columns will indicate the amino acid specified by the codon.
Here are some online resources for exploring codon tables:
* NCBI Genetic Codes: [https://www.ncbi.nlm.nih.gov/Taxonomy/Utils/wprintgc.cgi](https://www.ncbi.nlm.nih.gov/Taxonomy/Utils/wprintgc.cgi)
* Wikipedia: Genetic Code: [https://en.wikipedia.org/wiki/Genetic_code](https://en.wikipedia.org/wiki/Genetic_code)
Let me know if you have any other questions about codons, mRNA, or the genetic code!
