Use the codon chart to complete the questions below.

Question

DNA: T A C A C A C G A T G A A T C

what is mRNA

what is tRNA

What are Amino Acids

Predict one possible DNA sequence for the following protein: Methionine-Tyrosine-Isoleucine-Glutamine-Leucine-stop

what would be mRNA

what would be DNA

Answer 1

DNA: T A C A C A C G A T G A A T C

To get mRNA, replace all of the thymine bases with uracil: UACACACGAUGAAUC

To get tRNA, the mRNA undergoes transcription, which creates a complementary strand made up of the partnering bases (A with U, G with C): AUGUGUGCUACUUAG

To get amino acids, the tRNA underdoes translation, converting codons (sets of 3 bases) with amino acids. You'll need to use a codon table to match the codons with their corresponding amino acids: Met-Cys-Ala-Thr-Stop*

*Remember that UAG (Methionine) is the start codon and UAG is one of three stop codons, the other two being UAA and UGA.

Predict one possible DNA sequence for the following protein: Methionine-Tyrosine-Isoleucine-Glutamine-Leucine-stop.

Using the codon table, the given peptide sequence has tRNA: UAGUAUAUUGAACUUUAA

Remember that this is just one of the possible sequences because every amino acid has at least two different codons that both translate for it. For example, I used UAU for Tyrosine but UAC would also code for Tyrosine.

mRNA (matching bases): AUCAUAUAACUUGAAAUU

DNA (U's for T's): ATCATATAACTTGAAATT