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9 Cards in this Set

  • Front
  • Back
Plasma membranes...
Control which substances enter or leave the cell. They're Partially permeable.
The membrane around organelles can : (4 points)
Divide the cell into different components.
Be folded to increases their surface area and making chemical reactions more efficient.
Be partially permeable.
Form vesicles
Phospholipids have a ..1.. head and a ..2.. tail. The centre of the bilayer is hydrophobic so it doesn't allow water soluble substances ( like ..3.. and ..4.. to diffuse through it.
1=hydrophilic
2=hydrophobic
3=Ions
4=Polar molecules
Cholesterol gives the membrane ..1.. Cholesterol binds to the hydrophobic tail of the phospholipids causing them to pack more closely. This makes the membrane less ..2.. and more stable.
1=Stability
2=Fluid
Proteins control ..1.. Some proteins form ..2.. in the membrane. These allow ..3.. through. Other proteins transport larger molecules and charged particles across the membrane by ..4.. Proteins also act as ..5.. for molecules in cell signalling.
1= What enters and leaves the cell
2=Channels
3=Small, charged particles
4=Active transport and facilitated diffusion
5=Receptors
Glycolipids and glycoproteins ...(3 things)
Stabilises the membrane by forming hydrogen bonds with surrounding water molecules.
The act as receptors for messenger molecules in cell signalling.
They're also antigens.
Cell membrane below 0°C
Phospholipids don't have much energy and so they're packed closely together and the membrane is rigid.
The channel proteins and carrier proteins denature, increasing permeability of the membrane.
Cell membrane between 0°C and 45°C
Phospholipids can move around, the membrane is partially permeable. As the temperature increases the phospholipids move more and increase the permeability of the membrane.
Cell membrane above 45°C
The phospholipid bilayer starts to break down and the membrane becomes more permeable. water inside the cell expands, putting pressure on the membrane. Channel proteins and carrier proteins inside the cell denature which increases the permeability of the membrane.