The presence of a homologous structure suggests common ancestry, and further suggests that the nearest common ancestor of two organisms had the trait which is homologous. Comparison of several modern organisms with different variations of the same homologous structure can suggest what the original ancestor's actual characteristics were, and comparison of the structure in different organisms can also suggest which organisms are more or less closely related
Siamese cats most of the time mate with Aegean cats, and the reason why is because Aegean cats are also domesticated and most of the times can easily be found.
MRNA, is used to transcript DNA codes from DNA molecules and then later exits the nucleus via nuclear pore, then moves to the ribosome. Then, tRNA is activated to bring specific amino acid to the ribosome for translation. Ribosome, which is the site of synthesis of proteins, is composed of rRNA and ribosomal proteins.
A codon is a three-base sequence (three nitrogen bases in a row) on mRNA. An anticodon is a three-base sequence on tRNA. It matches the codon.