Me figure these out and is there a specific way to find the amino acid

1) If mRNA is UAU-GGG, What are the two amino acids

In mRNA UAU it is leucine amino acid is present which is used for biosynthesis of proteins. Leucine is an alpha-amino acid, and it also contains an alpha- groups, an alpha – carboxylic acid group. And GGG is the glycine it is the building block of protein. Being not an essential amino acid, it can also be induced from other chemicals.  

2)If DNA is TAT-CGC, what are the two amino acids

In DNA TAT is leucine amino acid is present which is used for biosynthesis of proteins. Leucine is an alpha-amino acid, and it also contains an alpha- groups, an alpha – carboxylic acid group. CGC have the proline amino acid in it, it is an proteinogenic amino acid, used biosynthesis of the proteins.

3)If tRNA is GAC - AGU, what are the two amino acids

In tRNA GAC the amino acid is aspartic acid, being side chain also enzyme and proteins in the body. AGU is the serine amino acid.  

it depends on how much it could carry.