00:01
All right, so here we have a number of true or false questions.
00:03
Let's get there as many of them as we can.
00:05
So among the functions of cholesterol, four functions.
00:08
We've got membrane components, raw material for other steroids.
00:12
It's a precursor for most steroids, hormones and bile salts.
00:16
Perfect.
00:17
The four uses of cholesterol in the body, true.
00:19
Overall net charge of baline at ph 7 .4 is, i believe it's typo.
00:25
It's zero, and that is its zwitter ion.
00:28
Yes.
00:28
So most amino acids at a neutralish ph will take on this type of confirmation where we have the c double bond o and then the o and then this will have a minus charge because the hydrogen has been taken off of it.
00:44
Whereas on the amine end, we would see that the nitrogen has more bonds than it usually likes and as such has a plus charge.
00:54
So we've got a plus charge over here, a minus charge over here.
00:58
And so this is considered as a winter ion because it's charged, but the charges cancel out to zero.
01:04
Then here we have our r group.
01:05
Balian is like an uncharged r group...