Lipids Flashcards
What do all lipids contain?
Carbon, hydrogen & oxygen
Are lipids soluble or insoluble in water?
Insoluble
In what solutions are lipids soluble?
Organic solvents such as alcohols & acetone
What is the main group of lipids?
Triglycerides (fats & oils)
How do lipids provide a source of energy?
When oxidised, they provide twice the amount of energy as carbohydrate
How are lipids used in waterproofing?
Insoluble in water. Waxy lipid cuticles
Why are lipids good insulators?
Slow conductors of heat and electrical insulators around myelin sheath of nerves
How is fat used as protection?
Stored around delicate organs
Define triglycerides
Three fatty acids combined with glycerol
What bond joins triglycerides?
Ester bonds
What does hydrolysis of a triglyceride form?
Glycerol and three fatty acids
Triglycerides have a ……. mass to energy ratio
Low
What sections of a phospholipid are hydrophobic and hydrophilic?
Hydrophilic head and hydrophobic tail
What is the test for lipids?
Emulsion test. Cloudy colour shows a lipid is present
