Compare and contrast the composition and structure of ba...

Question

Compare and contrast the composition and structure of bacterial and eukaryotic ribosomes, identifying at least three features that are the same and three features that are unique to each type of ribosome.

Accepted Answer

Hi, everyone. Welcome back. Here's the next question. Bacterial ribosomes contain a small subunit made up of blank R R N A. While eucaryotic ribosomes contain a small subunit made up of blink R R N A. And our answer choices are a 16 s 18 S B, 18 s 16 S C sas or D A S 70 s. Well, some key things to focus in on here. In both cases, we're talking about the small subunit ribosomes have a small subunit and a larger subunit. And specifically, we're talking about just the R R N A portion. The sub units of the ribosomes contain R R N A plus proteins. So this is a little bit tricky because we're only talking about the R R N A molecule making up the subunit and not the total size. So not the total size of the subunit. And then we're talking about that in bacterial ribosomes versus eukaryotic ribosomes. So a good guess is if we're talking about pro caros versus you carry outs, things in the pro carrots are usually smaller. So if we can't remember off the top of our heads, that's usually a good guess. And that is indeed the case here, the bacterial ribosome has a small subunit with an R R N A molecule of 16 S while the Eu Caro ribosomes have the small subunit with 18 S R R N A. So that is our choice A here that is a unit called this Edberg unit, which is the sedimentation rate of a particle. So that's where that size comes from. And let's just look at our other answer choices to see why they are not correct. Choice B has the correct numbers, but in the wrong order, choice of C and D have the sizes 70 S and 80 s and those are the sizes of the total ribosome. So 70 and 80 s are the prokaryotic and E Caro total ribosome size. So including both subunits, the whole thing. But that's why that's not our correct answer. Nor is the other order and D A S 70 s, luckily they didn't throw in to fool us the size of the total subunits uh which is 30 S and pro carats and 40 S and new carry outs. But again, we're just focusing on what is the size of the R R N A in those subunits and bacterial ribosomes have the small subunit of choice A 16 S R R N A while you carry out ribosomes have a small subunit made up of 18 S R R N A. So choice A is our correct answer. See you in the next video.

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Compare and contrast the composition and structure of bacterial and eukaryotic ribosomes, identifying at least three features that are the same and three features that are unique to each type of ribosome.