What is the significance of the first and last codons | Quick Homework Help

Assignment details for part one:

Transcribe and translate EACH of the three following DNA gene sequences. Turn these in using the graphic organizer. The letters represent the DNA N-base sequences of the genes.

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The first is the original gene. The next two are mutations of the original. Note that the changes (mutations) are shown in red.

Original Gene sequence 3′-T A C C C T T T A G T A G C C A C T-5

Mutated gene sequence 1 3′-T A C G C T T T A G T A G C C A T T-5′

Mutated gene sequence 2 3′-T A A C C T T T A C T A G G C A C T-5′

Also, answer the following questions:

•What is the significance of the first and last codons of an mRNA transcript?
•What meaning do these mRNA codons have for protein synthesis?
•Did the mutations result in a change in the final proteins? If so, describe the change.
•In general, why might a change in amino acid sequence affect protein function?

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