I have a C here, not a G, it’s a C. So just like that. And how many possible codons do you have? So cytosine just like that. And so it’s very similar except for when we’re talking about RNA, adenine, instead of pairing with thymine, is now going to pair with uracil. And so you can imagine if you were to split these, these things you could call them two sides of the ladder, that either side could be used to construct the other side.
Or actually used to code for a certain type of protein. I have a C here, not a G, it’s a C. And what happens in transcription, let’s go back to looking at one side of this DNA molecule. So how does DNA replicate? So actually I think I’m on the wrong, let me go back here.
And then we have an A, let me make sure I change it to the right color.
DNA structure and replication review (article) | Khan Academy
And so let me copy and then let me paste. Now how does that happen?
So let me just write it here, this is amino acid 1. Well you have one of gomework bases and you have them in three different places, so you have four times four times four, possible codon words I guess you could say. So just like that. DNA has uracil instead of the thymine. So what role does this play as we are trying to express the information in this DNA?
Molecular structure of RNA. So once again it might be part of a molecule that has not seven or eight base pairs, but might have 70 million base pairs. And this process is called replication.
DNA replication and RNA transcription and translation
If you’re seeing this message, it means we’re having trouble loading external resources on our website. So the next thing you’re probably thinking about, “Okay, well it’s nice to be able to replicate yourself “but that’s kind of useless if that information can’t be “used to define the organism in some way “to express what’s actually happening. Ribonucleic acid, let me write that down.
RNA and protein synthesis review. And so three bases together, so these bases right over here, these I guess you could say this three letter word or this three letter sequence, that’s called a codon. And so now that thing can leave the nucleus, go attach to a ribosome, and we’ll talk more about that in future videos exactly how that’s happened, and then this code can be used to actually code for proteins.
And then finally I have a G. So there we go, actually I didn’t wanna do that. And so you can imagine if you were to split these, these things you could call them two sides of the ladder, that either side could be used to construct the other side.
And we actually haven’t drawn the next codon after that ’cause we need three bases to get to the next codon. And actually that warrants a little bit of a detour because you hear sometimes the words DNA and chromosome and gene used somewhat interchangeably, and they are clearly related, but it’s worth knowing what is what. And they also, you might have more than one codon coding for the same amino acid.
So this is overkill and allows codons to be used for other purposes as well. Sybthesis we’re gonna focus on a conceptual level, I’m not gonna go into all of the, I guess you could say biochemical details. I wanted the other side. And so transcription is a very similar conceputal idea, where we’re now going to construct a strand of RNA and specifically mRNA ’cause it’s going to take that information outside of the nucleus.
And then let’s copy and paste the other side. Answere what we wanna do in this video is get a better appreciation for why it is suitable, and the mechanism by which it is the molecular basis for heredity.
Dna rna protein synthesis homework #2 dna replication – Google Docs
So we have an adenine and thymine, adenine and thymine, adenine and thymine. And so it’ll construct the sequence of amino acids. Thymine is still going to pair with adenine, just like that. Guanine is gonna pair with cytosine, and cytosine is going to pair with guanine.
And replication, you can imagine taking either splitting these two sides of the ladder, and actually let’s do that. So let me copy and paste, so if I take that side right over there, so let me copy and then paste it.