cell membrane

Question 1

draw a diagram of the cell membrane

Answer 1

integral protein
phospholipid bilayer
phospholipid molecules
cholesterol
glycoprotein
peripheral protein
phospholipid bilayer

Question 2

functions of the cell membrane

Answer 2

> maintains the cell shape
forms cell boundary and encloses cell contents
cellular signalling
cell-cell communication
cell-cell regoconition

Question 3

draw diagram of the phospholipid bilayer

Answer 3

lipid bilayer= two layers of phospholipids
hydrophobic= molecules pass through easily
hydrophilic=molecules do not pass through easily

Question 4

difference between active transport and passive transport

Answer 4

> active transport requires energy and moves substances against their concentration gradient.
e.g. sodium potassium pump and proton pump
whereas active transport doesnt require energy and moves substances along their concentration gradient
e.g. glucose transporters

Question 5

draw a labelled diagram of the golgi

Answer 5

cisternal space
ribosomes
lumen
cisternae
incomingvesicle
new forming vesicle
secretory vesicle
rough er
smooth er

Question 6

function of er

Answer 6

synthesis, activation and transport of macro molecules in the cell

Question 7

the smooth er…..

Answer 7

> contains enzymes important in synthesis of lipids and steroids
detoxification of drugs and poison
stores Ca2+

Question 8

rough er…..

Answer 8

> proteins produced on ribosomes
makes new membrane