Biological Molecules- Lipids
- Created by: gsemma
- Created on: 09-01-19 10:26
View mindmap
- Lipids
- a group of substances containing large amounts of carbon and hydrogen
- insoluble in water but are soluble in alcohol because they are non-polar
- glycerol molecule
- glyceride (draw)
- 3 fatty acids (draw)
- Triglycerides (draw)
- lipids made of one glycerol molecule and 3 fatty acids joined by an ester bond
- functions
- energy source- respired to rlase ATP
- insoluble in water and high prop. of hydrogen means more energy is released per gram of fat then a gram of glucose
- insulation- the adipose tissues store fats in animals to keep them warm
- buoyancy- less dense than water so helps floating
- protection- forms a layer of mechanical insulation around vital organs
- energy source- respired to rlase ATP
- saturated- no C=C bonds. max amount of H
- Unsaturated- C=C bonds
- 1 C=C- mono-unsaturted
- more than 1= poly-unsaturated
- kinked due to double bond- take up more space hence lower melting points
- 1 C=C- mono-unsaturted
- Unsaturated- C=C bonds
- Triglycerides (draw)
- 3 fatty acids (draw)
- each hydroxyl group can be lost to form an ester bond with a fatty acid
- glyceride (draw)
- ester bond
- draw below
- each glycerol molecule can form covalent ester bonds with 3 fatty acids
- condensation reaction
- the water molecule released is dervived from the OH groups from the fatty acid and glycerol
- condensation reaction
- phospholipids
- a glycerol molecule bonded to 2 fatty acids and 1 phosphate group
- found in cell membranes in phospholipid bilayers
- phosphate head is hydrophilic so dissolves on outside of bilayer
- fatty tail is hydrophobic so form a barrier that water-soluble molecules cannot pass
- a glycerol molecule bonded to 2 fatty acids and 1 phosphate group
- Test
- Emulsion test
- shake sample with ethanol- if turns milky white- lipid present
- Emulsion test
- a group of substances containing large amounts of carbon and hydrogen
Similar Biology resources:
Teacher recommended
Comments
No comments have yet been made