The Fluid Mosaic Model - BIO 102 CONTENT Flashcards
1
Q
What do cell membranes consist of?
A
- Phospholipid bilayer
- Proteins
- Cholesterol
- Glycolipids and glycoproteins
2
Q
What is membrane fluidity influenced by?
A
The presence of unsaturated hydrocarbon tails and steroids (ie. cholesterol)
3
Q
Phospholipid bilayer
A
- A double layer of phospholipids made up of hydrophobic tails and hydrophilic heads
4
Q
Two types of proteins
A
- Peripheral Proteins
- Integral Proteins
5
Q
Peripheral Proteins
A
- Found on either the external or internal surface of the membrane
- They are hydrophilic
6
Q
Integral Proteins
A
- Includes transmembrane proteins
- Span from the extracellular side to the intracellular side of the membrane
- Mostly hydrophobic
7
Q
Cholestral
A
- Steroid-based lipid
- Gives the membrane flexibility
- At low temps, keeps fluidity and prevents hardening
- At high temps, maintains rigidity of membrane
8
Q
Glycoproteins
A
Carbohydrate chains attached to proteins
9
Q
Glycolipids
A
Carbohydrate chains attached to lipids
10
Q
What do glycoproteins and glycolipids have in common?
A
- Only found extracellulary
- Involved in cell-to-cell recognition and cell communication
- Not in plant cells
