What is a codon? (for my honors biology final tomorrow, ! )

A codon is the 3 nucleotide sequence which codes for an amino acid, stop or start signal in translating a protein.

example:
common mRNA start codon is AUG
(Adenine, Uracil, Guanine)

one of the codons for the amino acid Alanine is : GCU
from general genetic code table for RNA.

codons will be abreviated by 3 nucleotide letters A, G, U, T, C

Uracil is only in RNA codons
there are also DNA codon tables
these tables are a general guide as different organisms may have special codons they utilize.
below is a table of the twenty most common amino acids that make up proteins, below each are the codons generally found to code fore them.

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.