Cell Membrane Flashcards
What is the name if the arrangement of Phospholipids?
Phospholipid bilayer
What 2 main components make up the phospholipid?
Hydrophilic head
Hydrophobic tails
How do hydrophilic heads react to water?
Attract water
How do hydrophobic tails react to water?
Repel water
What do the hydrophilic heads contain?
Phosphate group
What does the hydrophobic tails have?
2 fatty acids
Explain osmosis.
Water molecules move from an area of high water potential to an area of low water potential. Passive (doesn’t need energy) and moves across a partially permeable membrane.
Describe the main permeable membrane characteristic.
Allows all types of molecules to move across.
Describe the main partially permeable membrane characteristic.
Only allows certain molecules across.
Describe the main impermeable membrane characteristic.
Doesn’t allow any molecules across.
Name 4 types of organic molecules that can be found in a cell surface membrane?
Protein (channel)
Glycolipid
Cholesterol molecules
Glycoprotein
When in water, what 2 structures do the phospholipids form?
Micelle or bilayer
What functions does cholesterol have?
Controls fluidity of the membrane and maintains structural rigidity/stability.
What 2 intrinsic proteins types are found in the cell membrane?
Integral (carrier) and peripherial (channel)
What do the integral/carrier proteins do?
Transport large molecules across the membrane. Attach to the large molecule and then realise it on the other side.
