Given the following codons and their corresponding amino acids UUU- Pheylalanine
CUA - Leucine
GCU - Alanine
AAA - Lysine

a) show the mRNA sequence which codes for the short peptide, lys-ala-phe-leu. Include what should come before and aftér this short message.

b) Show the TRNAS anticodons that would line up at the mRNA

c) Show the base sequence that would be found in the DNA double helix which carries the gene for this peptide.
Label the coding and template strand. You do not need to label the 5' and 3' ends.

Given:

UUU- phenylalanine

CUA- Leucine

GCU-Alanine

AAA-Lysine

a) mRNA sequence or codons for the short peptide with amono acid sequence of lys-ala-phe-leu would be:

mRNA (Codons)      5’-AAA-GCU-UUU-CUA-3’  

b) tRNA anticodon for the same amino acid sequence lys-ala-phe-leu on the base of mRNA 5’-AAA-GCU-UUU-CUA-3’  would be :

tRNA (Anticodons)     3’-UUU-CGA-AAA-GAU-5’

c) base sequence that would be found in the DNA double helix which carries the gene for this peptide -

5’-AAA-GCT-TTT-CTA-3’     Coding DNA Strand

3’-TTT-CGA-AAA-GAT-5’   Template DNA Strand

the answer is:

carbon dioxide

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