Cell Membrane Flashcards
Fluids membrane with mosaic of proteins and lipid bilayer
Fluid mosaic model
4 components of the cell membrane
- Phospholipid bilayer
- Transmembrane protein
3. Interior proteins - Unique cell surface markers
What bonds hold the cell membrane together?
Hydrogen bonds between water
What can move freely throughout the cell membrane
Phospholipids and unanchored proteins
What stabilizes the membrane?
Cholesterol
What 2 factors effect the membrane’s fluidity?
Saturation and temperature
Where do non-polar and polar proteins embed in the membrane?
Polar- hydrophilic
Non polar- hydrophobic
Anchored to phospholipid
Non polar domain inserted in bilayer
Float throughout one layer of the bilayer
Peripheral membrane proteins
What type of protein has 7 hydrophobic domains?
Transmembrane protein
Non polar domains in hydrophobic regions
Polar domains protrude from both sides
Integral membrane proteins
Polar pore that consists of beta sheets and allows polar molecules to pass
B-Barrel
Move with concentration gradient. Requires no energy
Passive transport
Move against concentration gradient. Uses energy (ATP)
Active transport
Selectively permeable membrane
Channel proteins
Carrier proteins
Passive transport
Diffusion from higher concentration to lower concentration
Osmosis
