00:01
Which of these constitutes the secondary structure of a protein? the folding of the chain, association of multiple polypeptides, the sequence of amino acids, a beta pleated sheet, or polypeptides stacked on top of each other.
00:16
Okay, so protein structure has four levels.
00:19
Primary, secondary, tertiary and quaternary.
00:24
Quaternary is optional.
00:26
Let's go through what they are.
00:28
So primary is literally the sequence of amino acids.
00:30
So it's describing c.
00:33
So we can roll that out.
00:35
Secondary refers to the more basic interactions of that sequence.
00:41
So for example, you get simple shapes like alpha helices and beta sheets.
00:49
So the answer here is actually d.
00:51
This is an example of secondary structures.
00:55
Let's keep going.
00:55
Look at the other answers as well...
