Triglycerides: Fatty acid
- Made up of 1 molecule of glycerol with 3 hydrocarbon tails attached.(insoluble)
- The hydrocarbon tails are hydrophobic (water hating) and are also insoluble in water
- The same basic structure but the tail varies
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- Similar to triglycerides but one hydrocarbon tail is replaced by a phosphate group.
- The phosphate head is polar so it attracts water molecules.
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- Has a hydrocarbon ring structure attached to a hydrocarbon tail
- Hydrocarbon ring has a hydroxyl group attached to it (OH) this makes it polar and soluble.
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How their structure relates to their function (Q)
Triglycerides: mainly used for energy storage
- The long hydrocarbon tails have a lot of chemical energy. Its released when theyre broken down.
Phospholipids: Controls what goes in and out of the cell by making up the bilayer.
- centre of bilayer is hydrophobic water soluble substances cant easily pass through so it acts as a barrier. The phospholipids move around to make it hard for other substances to get through e.g ions.
- Helps strengthen cell membrane by stabilizing the rigidity of it and interacting with the phospholipid bilayer.
- Bind to hydrophoboc tails- tails pack more closely together.
- So the membrane becomes less fluid
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- Describe the structure and function of a triglyceride
- How many hydrocarbon tails does it have?
- is it soluble or insoluble?
- What is the basic structure like?
- Describe the structure and function of a phospholipid
- Is the phosphate group polar or non polar, what does this do?
- Is it soluble or non soluble?
- Describe the structure and function of a cholestrol
- where is it positioned?
- what does it do to the membrane?
- what special group is attached to the ring?
- is it polar or non polar
- soluble or non soluble
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