Lecture 7: Cell membrane

Question 1

what type of cell is a cell membrane

Answer 1

amphipatic because it has both hydrophobic and hydrophilic (outside of the cell) regions

Question 2

what are the types movement across molecule

Answer 2

simple diffusion, facilitated diffusion, osmosis, active transport and co transport

Question 3

what happens in simple diffusion

Answer 3

The net movement of particles from an area of high concentration to an area of lower concentration.
Oxygen, lipids and carbon dioxide (small, non-polar, soluble in lipids, can dissolve in hydrophobic bilayer)
Molecules move down the concentration gradient

Question 4

facilitated diffusion

Answer 4

larger molecules (amino acids and glucose) diffuse slowly
Charged particles (ions and polar molecules) because they are water soluble (centre of bilayer is hydrophobic) also would diffuse slowly
channel proteins for pores - for smaller ions and polar molecules
carrier proteins (large molecules including polar and ion)

Question 5

osmosis

Answer 5

////

Question 6

active transport

Answer 6

……..atp energy source …..

Question 7

co transport

Answer 7

Type of carrier protein
Bind 2 molecules at a time
Concentration gradient of one is used to move the other molecule

Question 8

add the types of movements

Answer 8

……………

Question 9

protein channel for small charged particles

Answer 9

carrier proteins larger charged particles
…………..