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This is the answer to chapter 3, problem number 51, from the smith organic chemistry textbook.
00:10
And in this problem, we're asked to think about two types of phospholipids.
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So we're told one example of a phospholipid was drawn in section 3 .7a.
00:25
And then another having carbon -carbon double bonds and its carbon change is drawn in the problem.
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I've redrawn the important part of the one that they give us in the problem here on the screen.
00:38
And basically we're asked which of those two phospholipids is going to be present in a more rigid cell membrane and why.
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And so the answer is going to be a phospholipid without carbon -carbon -carbon double bonds.
00:57
So as you can see, the carbon -carbon -carbon double bonds here and here cause these chains to kink.
01:06
So they're not straight chains.
01:09
So if we think about them packing into lines, so side -by -side lines, what we're actually talking about then is something like this, where these chains cannot pack as tightly together.
01:36
Because they have double bonds in them...