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Ch. 14 - Translation and Proteins

Chapter 14, Problem 10

What are isoaccepting tRNAs? Assuming that there are only 20 different aminoacyl tRNA synthetases but 31 different tRNAs, speculate on parameters that might be used to ensure that each charged tRNA has received the correct amino acid.

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Hi everyone. Let's look at the next problem. It says identify the incorrect statement about T R. N. A. And we've got questions about different characteristics of T. RNA. So I'm just going to put up a picture. Little diagram of our T RNA structure here to refer to. And let's look through our answer choices here, remembering that we are looking for an incorrect statement. Choice A says it has a structure like a cloverleaf. Well, this is true. We can see this sort of um leaf like structure here in our diagram. So not our answer choice choice B says it has an anti code on which is complementary to the code on. Well, this is true Up in this region here is where you have three base pairs that make up the anti code on and are complementary to the code on on the RNA. So that since that's true, that's not our answer choice choice C says it has a three prime amino acid binding site. Well, that's what it does on this three prime end. This is the amino acid binding site where it can bring in it matches with the RNA transcript and then it comes along with an amino acid to attach it to the growing protein. So, since that's true, that's also not our answer. So now we're joined. Now we're on choice D. Which is it has a constant C C. A sequence at the five prime end. Well, here's our C C. A sequence but it's not at the five prime end. It's at the three prime end. So that is false. Since the sequences at the three prime end. So therefore Choice D is our answer here. So what is the incorrect statement about T r a? Choice D? It has a constant C C. A sequence at the five prime end. See you in the next video.