Forces acting on membranes

Question 1

What kind of membrane proteins can’t be removed without disrupting the membrane?

Answer 1

Integral Membrane Proteins (Ampipathic, same orientation as phospholipids)

Question 2

What kind of membrane proteins can be removed without disrupting the membrane?

Answer 2

Peripheral Membrane Proteins. (Not ampipathic, cell shape and motility)

Question 3

Dystrophin is an example of what kind of membrane protein and what disease results from a deficiency of it?

Answer 3

Peripheral. Muscular Dystrophy.

Question 4

What factors is diffusion aided by?

Answer 4

A large surface area
High permeability
High conc. gradient

Question 5

What do molecules need to be to pass through the lipid bilayer?

Answer 5

Small
Uncharged
Lipophilic (Hydrophobic)

Question 6

What are the two general types of protein channels

Answer 6

Voltage Gated

Ligand Gated

Question 7

Does the Inside or the outside of the cell carry a negative charge?

Answer 7

The Inside

Question 8

What are the two types of carrier mediated transport systems?

Answer 8

Facilitated Diffusion- needs no direct energy source

Active Transport-requires ATP (Na/K pump)

Question 9

What is Osmolarity?

Answer 9

The number of osmoles of solute per litre of solution.

Question 10

What is Osmolality?

Answer 10

The measure of osmoles of solute per kilogram of solvent.

Question 11

If a cell is placed in a Hypertonic solution, what will happen to it?

Answer 11

shrink

Question 12

If a cell is placed in a Hypotonic solution, what will happen to it?

Answer 12

It will Swell and burst

Question 13

What is tonicity determined by

Answer 13

the concentration of non-penetrating solutes on either side of the cell

Question 14

What is an isosmotic solution

Answer 14

There is an equal number of both penetrating and non penetrating solutes on either side of the cell membrane

Question 15

What is an isotonic solution

Answer 15

There is an equal number of non-penetrating solutes on either side of the cell membrane