The diagram of a eukaryotic ribosome shown below contains seve...

Question

The diagram of a eukaryotic ribosome shown below contains several errors.

Diagram of a eukaryotic ribosome with labeled sites and mRNA sequence, indicating errors to be corrected.

Redraw the diagram, and correct each error using the mRNA sequence shown.

Accepted Answer

Hi, everyone. Let's look at our next question. In bacterial ribosomes. The small subunit is made up of a single 16 S R R N A molecule and a few smaller proteins. This 16 S R R N A molecule is critical for the initial binding of blank during the translation process. And our choices are a transfer R N A or T R N A B messenger R N A or M R N AC initiation factors or D amino acids. So we're talking about the small subunit of the ribosome, which is composed of a 16 S R R N A with several small proteins. And we're specifically asking about that 16 S R R N A molecule looking for something it binds to saying it's critical for the initial binding of blank in the translation process. Well, that R R N A has a highly conserved sequence called the Shine Del Garno sequence. And that sequence binds to the ribosome binding site on the M R N A that will be translated. So the M R N A is going to be translated. It needs to be arranged in the correct position in the ribosome for translation And that happens through this binding with the Shin Del Garno sequence in the 16 S R R N A molecule that binding gets the M R N A lined up properly. Once that happens, the large subunit comes along binds to the small subunit and you have a functional ribosome ready to translate. So our answer here will be choice B messenger R N A. When we look at our other answer, choices, one thing that might cause us a little bit of hesitation is choice C initiation factors as initiation factors are proteins that bind to the small subunit of the ribosome where that 16 S R R N A is to help initiate translation. So they're involved in this beginning of translation and they are specifically binding to that small subunit, but it's not as specific as being part of just the 16 S R R N A and the initial binding of something. So the initiation factors bind to different uh different parts of that small subunit and then to other factors including T R N A S and they can interact with repressor proteins and things like that. So choice C um can cause us a little bit of hesitation as they're involved in this whole initial process at the beginning of translation. But we're specifically looking at that R N A portion of the small subunit and the initial binding of M R N A. Then our other answer choice is a transfer R N A is not our correct answers. It's the M R N A that's bound to that shine Del Garno sequence and choice D amino acids of course, are brought in by the T R N A S. So not our correct answer. So again, that 16 S R R N A is critical for the initial binding of choice B messenger R N A during the translation process. See you in the next video.

The diagram of a eukaryotic ribosome shown below contains several errors.

Redraw the diagram, and correct each error using the mRNA sequence shown.

Key Concepts

Eukaryotic Ribosome Structure

mRNA Sequence and Codons

Translation Process

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