Cell Membrane Flashcards
What are the 5 things that make up the cell membrane
Intrinsic protein
Extrinsic protein
Cholesterol
Glycolipids
Glycoproteins
What is the function of a phospholipid
It acts as a barrier for certain substances
The more polar and larger the molecule, the less likely it is to enter
What is the function of cholesterol
Maintains the membrane fluidity
The more cholesterol, the more rigid the membrane
What is the function of intrinsic protein
Used for transport in/out of the cell via active carrier proteins or passive channel proteins
What is the function of extrinsic protein
Combines with glycogen to create a glycoprotein
What is the function of glycolipids
Used for recognition - for determining whether or not a cell belongs in the body
What is the function of glycoproteins
Act as antigens or receptors for hormones
Why is the structure of a membrane described as fluid mosaic
(Fluid) Phospholipids move relevant to each other, (mosaic) embedded proteins vary in shape, size and pattern
What type of molecule can pass through a membrane
Small, non polar molecules
Lipid soluble molecules
What types of molecules can not pass through? Why?
Water soluble molecules - because of the hydrophobic tails
What must water soluble molecules pass through
Protein channels or carrier proteins
What is the passage for most molecules controlled by
Proteins
