00:03
Strains of nucleotides are written from 5 to 3.
00:08
But what does the 5 to 3 mean or stand for or come from? if we look at a nucleotide, you have a phosphate group.
00:38
Let's circle that.
00:46
And then you have a sugar.
00:50
The sugar is made of 5 carbons, and that's where the numbers come from.
00:58
Oxygen.
01:02
This is where our nitrogenous base is going to come off of.
01:20
Then what we'll do right here.
01:28
Okay, so let's number these carbons.
01:31
So the first carbon, we start with this here.
01:33
This is number one, the circle right here.
01:37
And this is the carbon that the nitrogenous base attaches to.
01:44
This is carbon number two.
01:48
Not particularly important.
01:51
This is carbon number three.
01:54
This is where our three comes from, when we're writing from five to three.
01:58
And off of this, we have an oh...