Phospholipids And Cholesterol Flashcards
What is different in the structure of a phospholipid to a triglyceride?
One of the fatty acids is replaced with a phosphate group
Usually there is one of each what in a phospholipid?
One saturated FA
One unsaturated FA
How many carbons are usually in the hydrocarbon chains of a phospholipid?
16-18 the number is usually even
What part of a phospholipid is hydrophilic?
The head
Why are fatty acids hydrophobic?
They are non polar
What word describes the properties of these phospholipids in water?
Amphiphatic
In water phospholipids either form a film or a ball shape. What is this ball shape called?
Micelles
In a phospholipid bilateral where are the tails and the heads?
Tails in heads out
What percentage of animal and plant membranes are phospholipids?
80%
Phospholipids are free to move about in the belayer but will never expose their tails. What does this give the membrane?
Stability
Cholesterol is what?
A steroid alcohol or sterol
A type of lipid made without fatty acids or glycerol
Where is cholesterol found?
Within the phospholipid bilayer
What does cholesterol do?
Maintains the fluidity of the phospholipid bilayer not too fluid not too stiff
Where is cholesterol mainly made?
In the liver of animals
What is the plants version of cholesterol called?
Stigmasterol
