00:01
This question is asking us about levels of protein structure.
00:04
So let's go over all of them.
00:07
So the primary structure of a protein is just the chain of amino acids in a protein that is held together by peptide bonds between amino acids.
00:15
So it's just the sequence and the chain here.
00:18
From n to c terminus is how we usually write them.
00:23
And you can see that the bonds, the peptide bonds are between each amino acid in the chain.
00:30
Secondary structure is slightly more complex.
00:33
So the secondary structure of a protein is just the chain of amino acids, which we had in primary structure.
00:39
However, it's folded locally into either beta pleated sheets or alpha helices, held together by hydrogen bonds between the backbone.
00:49
So when we have this primary structure, the secondary structure is just that chain, but now it's folded locally into beta pleaded sheets with these hydrogen.
00:59
Bonds between the backbone or an alpha helix with these hydrogen bonds between the backbone again.
01:09
Tertiary structure is slightly more complex in secondary structure and tertiary structure is the 3d folding of the entire protein and that is due to the amino acid side chains interacting.
01:23
So if we have a protein here and it's tertiary structure, we can see there is a chain, but now we can see like there's a beta pleated sheet up here...