00:01
Hi everyone, in this video we're going to be talking about bonding, more specifically hydrogen bonding that takes place between the bases and dna, specifically between adenine and thymine.
00:13
So as we know, the dna double helix is being held up by hydrogen bonding between four bases, and the pairs are adening and thymine and guanine and cytosine.
00:26
So those pairs are going to make hydrogen bonds and all throughout the dna double bases.
00:30
Helix, that's what's going to be holding the helix together.
00:34
Now, if we're talking about hydrogen bonding, we really need to remember the definition of hydrogen bonding.
00:40
And the definition is, if we recall, it's where there is an attraction between an electronegative atom and a hydrogen, otherwise also known as a proton.
00:51
And so those electronegative atoms, and remember, those atoms that like to pull electrons towards themselves.
00:58
So some of the more electronegative atoms are oxygen, for example, or nitrogen, or the most electronegative atom, as we know, or elements as fluorine.
01:08
So if we want to take a look at how many possible hydrogen bonds are present between adene and thymine, we need to look at the possibilities for hydrogen bonding.
01:17
And remember, that has to be between a hydrogen and an extra negative atom.
01:23
So let's take a look here.
01:25
So as we can see, i see one electronegative atom here, and that's the oxymokin negative atom here.
01:30
Here on that's labeled this as carbon number one.
01:34
And let's go ahead and draw this little line here...
