The plasma membrane

Question 1

Functions

Answer 1

-Holds components inside the cell
-Allows things to enter and exit the cell
-Transport of molecules/ a protective layer

Question 2

3 components

Answer 2

-proteins
-phospholipid
-cholesterol

Question 3

3 proteins

Answer 3

-Integral
-Peripheral
-Glucoproteins

Question 4

Role of the membrane

Answer 4

-Partially permeable controlling the transport of molecules in and out
-Seperates the contents of the cell from the outside environment
-Allows cells to signal each other
-A site for biochemical reactions
-Allows cells to change shape

Question 5

Fluid mosaic model

Answer 5

-Has fluidity and can change shape
-All components that make up the membrane are all different shapes therefore making a ‘mosaic’
-Phospholipid molecules can move relative to each other providing a flexible structure

Question 6

Phospholipid bilayer/phopholipids

Answer 6

-Phospholipids allow lipid-soluble substances to enter/exit the cell, prevent water-soluble substances entering/ leaving and provide flexibility, Hydrophilic head/hydrophobic tail
-Phospholipid bilayer: two layers of phospholipids facing opposite ways