And 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. So adenine pairs with thymine just like that. Let me write that down. So this might be part of a gene Actually whoops, let me make sure I’m using the right tool. And this is actually a kind of conceptual level of how replication is done before a cell divides and replicates, and the entire cell duplicates itself. And so you can take half of each of this ladder, and then you can use it to construct the other half, and what you’ve essentially done is you’ve replicated the actual DNA. And so it’ll construct the sequence of amino acids.

So RNA stands for ribonucleic acid. And so it’ll construct the sequence of amino acids. Video transcript – [Voiceover] We’ve already talked about how DNA’s structure as this double helix, this twisted ladder, makes it suitable for being the molecular basis of heredity. Same reason why we call the DNA nucleic acid. But you’re still going to have cytosine and guanine pairing. Or we would need to be able to replicate it. So what role does this play as we are trying to express the information in this DNA?

DNA structure and replication review

So maybe I’ll do the new sugar phosphate backbone in yellow. And just to be clear, and we talked about this in the introductory video to DNA, DNA is much more than, you know, a handful of base pairs.

Which is good because you have 20 possible amino acids. Obviously you know if you eat an animal it’s going to be made up of fat dnna sugars and proteins, but the proteins are the things that actually do a lot of the whether they’re enzymes, whether they’re structural, the muscle is formed from proteins, these are the things, and I’m just drawing a small segment of them, they could be thousands or more of these amino acids long.


So using the original right hand side, once again the T is paired with the A, let me do that in adenine’s color. And this for the most part, and this is kind of how the information for life is stored. So for example this might be a section of a much longer molecule, so the much longer strand of DNA, and even there I’m ##2 not giving justice to it.

And this process is called replication. Impact of mutations on translation into amino acids. Guanine is gonna pair with cytosine, and cytosine is going synthssis pair with guanine.

And how many possible codons do you have? So adenine pairs with thymine just like that. So for the RNA and in this case the mRNA that’s going to leave the nucleus A is going to pair with U, Homewokr for uracil, so uracil, that’s the base we’re talking about, let me write it down, uracil.

And hlmework 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. But this might just be this very, very small section, let me do this in a different color, this little section right over here, zoomed in.

So actually I think I’m on the wrong, let rnw go back here.

dna rna protein synthesis homework #2 dna replication worksheet answers

So how does DNA replicate? Actually let me write this down.

Dna rna protein synthesis homework #2 dna replication – Google Docs

And so you might remember that DNA is deoxyribonucleic acid, so the sugar backbone in RNA is a very similar molecule, well now it’s got its oxy, it’s not deoxyribonucleic acid, it’s ribonucleic acid. Thymine pairs with adenine, guanine pairs with cytosine, cytosine pairs with guanine, falling a little bit down here.

Which is really taking this base pair sequence and turning it into an amino acid sequence. I wanted the other side.


So RNA stands for ribonucleic acid. And we covered this in the introduction video as well, but replicatino nice to see the different processes next to each other. It’s a new tool I’m using, so let me make sure I’m doing it right. This is what’s kind of doing the work of life. Or actually used to code for a certain type of protein. And they also, you might have more than one codon coding for the same amino acid.

dna rna protein synthesis homework #2 dna replication worksheet answers

And then let’s copy and paste the other homewkrk. So the tRNA, and I’m just gonna, it’s got some structure here, I’m not drawing it completely right, but it’s going to match replicwtion over here, where maybe it has an A, a U, and a G right over here and on this end it was attached to this amino acid, and so it matches them together.

So let me write this down, so now you’re gonna have adenine pairs not with thymine but uracil. And actually this amino acid is brought to here, they’re actually matched together by another type of RNA, this is mRNA we’re talking about right over here.

I have a C here, not a G, it’s a C. But now we’re not just trying to duplicate the DNA molecule, we’re actually trying to create a corresponding mRNA molecule. And replication, you can imagine taking either splitting these two sides of the ladder, and actually let’s do that. So let’s understand what a molecular basis of heredity would need to do. And we can do the same thing here using the original right hand side.