00:01
Hi, welcome, and thanks for joining me today in a video about dna replication.
00:05
So this question is asking, how does the physical structure of dna allow for dna replication? so first i'll kind of go through just the answer in words and then i'll illustrate it below.
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So the first thing is, is dna is bonded by hydrogen bonds together.
00:21
The two strands are by what are called complementary pairing or sometimes shargaf's rule.
00:26
Because erwin shargaf is the first person to really figure out that the, again, you know, the adenine, go with the thymines and the cytosines, go with the guanines, and those bases.
00:36
Hydrogen bond.
00:37
My lines are showing hydrogen bonds between the letters there.
00:40
Also, important to know, is dna replication is conservative.
00:43
We don't make dna from scratch, which i'll show you below.
00:46
Half of the dna we make is the parent, old strand, and half is the new strand, which i'm to illustrate right now.
00:52
So imagine we have a dna sequence here, a double strain of dna, and if you notice i have a replication fork shown, that would be right here where that dna.
01:01
Dna is breaking apart due to some enzymes doing this and then we're going to copy it.
01:06
So the way it works is dna structure allows us to use one strand as a template or like a blueprint to add the other...