Topic 10

Question 1

Describe the structure of the cell membrane

Answer 1

Bilayer of lipids and proteins

Biological membranes are semipermiable

Question 2

What is simple diffusion?

Answer 2

No energy requirement

Passing through pores of the membrant

Question 3

What determines membrane permeability?

Answer 3

Different molecule shapes/sizes

Diffusion constant

Membrane Thickness

Question 4

What can’t be used to calcualte membrane permeability?

Answer 4

Fick’s Law

Question 5

What is the correlation between membrane permeability and lipid solubility?

Answer 5

Positive

They are proportional to eachother

Question 6

What are the properties of facilitated diffusion?

Answer 6

Diffusion with assistance from membrane components:

Faster

Solutions can become more saturated

Specific

Cannot be inhibited

Question 7

What are the mechanics of facilitated diffusion?

Answer 7

Complex formation between molecule and carrier

The carrier molecule releases it as the other side of the membrane

Question 8

What is active transport?

Answer 8

Against concentration gradients

Uses ATP