00:01
We've been given the coding strand for the first 20 codons of the beta -globin gene.
00:06
We want to know the template strand.
00:08
We've got four possible options here.
00:11
Okay, so there are two rules you need to know if you want to work out the complementary sequence to this strand.
00:18
First of all, you need to know, but there are pair -binding rules.
00:24
And i'll put urisyl in.
00:26
So adenine goes to thymine or uracil.
00:28
Satazine goes to guan.
00:31
So are we looking at thymine or urosil here? thymine is for dna.
00:36
Euracil is for rna.
00:39
And both the coding and template strand are made of dna.
00:42
They have the two strands of dna.
00:45
So coding and templates are the two dna strands.
00:52
What's the difference? well, template is one that the mrna is actually being transcribed from.
00:58
So the mrna is complementary to the template.
01:01
The coding is also complementary to the template because they're usually bound in the double -stranded dna structure.
01:09
So we're using this rule, we also need to know that nucleic acids bind anti -parallel to each other.
01:19
So what do i mean by this? well, if i draw the strands that we've been given, it starts at 5 -fram, it ends at 3 -prime...