00:01
Okay, so this video will be going over problem three of chapter seven in biology concepts and investigations.
00:09
Um and this is asking why does the number of adenine nucleotides equal t.
00:16
And then g.
00:17
Equals c.
00:17
And d.
00:18
N.
00:18
A.
00:18
And this is um found by char gaffe.
00:22
That that this is to be true in all molecules of dna.
00:27
So if we remember so d.
00:29
N.
00:29
A.
00:29
Um has a very specific structure and it's made up of nucleotides.
00:35
These nucleotides um they have a phosphate group of sugar and a nitrogenous base.
00:41
And the nitrogenous bases are what the a.
00:44
G.
00:44
C.
00:45
And t.
00:45
R.
00:46
Um and that's what creates this code for guinea.
00:50
So the specific combination of these nucleotides crazy.
00:56
A code that can eventually be turned into rna.
01:00
And then turned into protein.
01:02
And then proteins do things in our body.
01:05
They make up different cellular components and stuff like that.
01:11
Um and so these new charges bases.
01:15
So this is this area down here.
01:20
Um all these all of these days is where the sugar would connect.
01:24
And then in touch the sugar would be the phosphate group.
01:26
A lot of the times you hear like phosphate backbone of dna.
01:31
So that's where that comes from.
01:35
And there are two different types of nitrogenous bases.
01:39
So the first one is peering.
01:46
Yeah.
01:48
Um imperials have two rings and i like to think of it.
01:55
This is how i remembered puree means.
01:57
Um was a.
02:00
G.
02:01
Is the chemical formula for gold.
02:05
Which is you know if you think of pure gold and then egg is the pairings.
02:11
That's just how i remembered it.
02:12
But you know whatever helps you.
02:15
It's fine if that doesn't make sense to you.
02:17
Um and then these are the pyramid means.
02:26
And i always thought of this as pie pi is one big circle of one.
02:36
It's only wondering.
02:38
So that's how i remembered pairings are two rings.
02:41
Pyramid means are wondering pairings as a g.
02:44
Pyramid means is c.
02:46
T.
02:46
And you can also think of that as like cut the pie c.
02:48
T.
02:49
Pie.
02:50
Uh huh.
02:51
And that's just some new monix to help you remember.
02:56
Yeah.
02:57
Okay.
02:57
So now when d.
03:01
N.
03:01
A.
03:01
Is exists, i guess there's two strands of dna and they connect to each other um kind of like their complementary strands.
03:12
So you can see something um where you have a and that is going to be hydrogen bonded to t.
03:25
On the other side of the dna.
03:28
And so there's two strands...