What are the differences between the universal code and ...

Question

What are the differences between the universal code and that found in the mitochondria of some species? Given that some changes (UGA =stop→Trp) have occurred multiple independent times in evolution, can you think of any selective advantage to the mitochondrial code?

Accepted Answer

Hey, everyone. Let's take a look at this question together. Plasmodium fesi differs from other eukaryotic genomes because it lacks a functional blank initiation codon or translation. Is it answer choice A U G A answer choice B U A G answer choice C U A A or answer choice D A U G. Let's work this problem out together to try to figure out which of the following codons is that initiation code on for translation. So when it comes to codons for translation, we know we have three stop protons and we also have one start hold on, meaning that we have three codons with no anti codon that if found in the sequence will cause translation to stop. And those three stop codons R U A A U G A N U A G and we have one start code on which is that code on that codes for me four M E T or its three letter abbreviation. And our one start codon that if found in the sequence initiates translation is the code on A U G. And so looking at our answer choices, we want to figure out which of the following codons is that initiation codon for translation or that one start CODON, which we know is A U G. And we can see that answer choice D A U G matches our start codon. So answer choice D is the correct answer. Since we know that there are three stop codons which are U A A U G A and U A G. And we can see that answer choice A B and C are the three stop codons. However, answer choice D is not a stop codon and is that start code on. So answer choice D is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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What are the differences between the universal code and that found in the mitochondria of some species? Given that some changes (UGA =stop→Trp) have occurred multiple independent times in evolution, can you think of any selective advantage to the mitochondrial code?

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