00:01
What does this line mean? so we've got a line about viruses.
00:05
Viruses are non -cellular organisms that are characterised by having an inert crystalline structure outside the living cell.
00:13
So first of all, a virus is a type of pathogen, and it's tiny, it has a very simple structure.
00:22
It has a core of genetic material, and this genetic material varies more than living genetic material.
00:31
If you look at any living organism, you're looking at double -stranded dna.
00:36
But viruses, they could have double -stranded dna.
00:40
They could have single -stranded dna.
00:42
They could have single -stranded rna.
00:46
Or they could have double -stranded rna.
00:49
They can't have a combination of dna and rna, but they can have any of these.
00:53
So, extremely variable.
00:57
And outside this, they have something called a capset.
01:02
And this is where we get the crystalline structure.
01:07
So the capsid is made up of protein.
01:10
And crystalline, so i'll define this word, crystalline means that the microscopic structure is very ordered.
01:20
So it's an ordered, repeating structure.
01:27
And we get that because of how this capsid is made up.
01:30
So this capsid could be made of only one or two types of protein, and these proteins are all subunits that make up this larger complex structure.
01:41
So it looks crystalline.
01:44
A common shape for this is icosahedral.
01:48
So very sharp edges...