00:01
So the question is, the alpha helix and beta pleated sheets are part of which protein structure? the primary structure, a.
00:09
The secondary structure, b.
00:12
C.
00:12
The tertiary structure, or d.
00:15
The quaternary structure.
00:17
Well first we need to know which, what are these structures? so the primary structure is going to be composed of amino acids in a chain or otherwise known as a polypeptide chain.
00:37
Whoops, structure, whoops.
00:48
And that kind of looks like this.
00:52
And any change in the amino acid sequence, so remember each one of these is an amino acid.
01:04
Any change in these amino acid structures will change the shape of the protein.
01:10
The secondary structure is where we're going to see those beta pleated sheets and alpha helixes.
01:25
And the alpha helixes are going to look kind of like that.
01:29
Beta pleated sheets, just like how they are, they will line nice and flat and they kind of look like this, but they're flat in a sheet like structure, hence the name.
01:47
Also, as i was saying, also these polypeptide chains are folded in a way due to the interactions between the amine and carboxyl groups of the peptide link.
02:07
And so that will decide whether or not they're going to be in the alpha structure or the beta pleated sheet structure.
02:19
So alpha helix is one of the most common ones that you see...