4 4.1/4.2 Cell Membrane Structute And Function Flashcards
What model of membrane do we use?
Fluid mosaic model
Name 3 uses of membranes
Let things in and out the cell
Create separate environments
Provide more surface area
Release proteins
Act as receptors
What is the pinhead like molecule that mainly makes up the membrane?
Phospholipids
What are the 2 layers called in a membrane?
Phospholipid bilayer
What are the different types of proteins in the membrane?
Channel proteins
Carrier proteins
Peripheral protein
Name the other parts of the membrane apart from the proteins and phospholipids
Glycoprotein
Glycolipid
Cholesterol
Which protein in the membrane is not intrinsic ( doesn’t go all the way through the membrane)
Peripheral protein
What is a glycolipid and a glycoproteins in a membrane
Glycolipid= glucose+ lipid
Glycoprotein= glucose+ protein
Describe the structure of a phospholipid
A phosphate at the head with a negative charge
Glycerol connecting the head and the tail
Fatty acid tails
Which parts of the phospholipid are hydrophobic and hydrophilic?
Head= hydrophilic
Tail= hydrophobic
What molecules can move through the phospholipid bilayer?
Water and non polar molecules
What molecules go through the channel protein?
Large molecules
Polar molecules
What is cholesterols role in the membrane and how does it do it?
Providing stability by restricting movement of phospholipids
Why are membrane permeable at -10 C
Proteins denature and membrane brakes
Why are membranes at average permeability at 20 C?
Molecules have more kinetic energy and membrane is still functioning
