Lecture 5 - electro chem gradients

Question 1

what is number of molecules moving across a surface proportional to according to adolf fick

Answer 1

The area of the interface (A)
The concentration gradient

Question 2

what did einstein say about speed of diff in diff dimensions

Answer 2

1D= t=d^2/2D
2D = 4D
3D = 6D

Question 3

einsteins diff rates applied to biology

Answer 3

1D diffusion: movement along DNA
2D diffusion: movement in a membrane
3D diffusion: movement in liquid (cytosol, extracelluar fluid)

Question 4

diffusion rates applied to catalysts

Answer 4

• catalysts provide 2D surface for molecules to bump into each other

Question 5

what is electrophoresis

Answer 5

movement of chaarged substance in electrical field

Question 6

what is electrochem gradient

Answer 6

gradient caused by diffusion-gradient caused by electrophoretic movement

Question 7

what 4 key factors is rate of ion movement across a channel depednent on

Answer 7

The size of the electrochemical gradient
The nature of the ion
Number of open ion channels
The properties of the ion channel

Question 8

what is current

Answer 8

flow of ions per sec

Question 9

what is voltage/PD

Answer 9

gradient between the compartmnets

Question 10

what is resistance

Answer 10

um idk look at the diagram

Question 11

what 2 properties of an ion channel can affect the rate of flow

Answer 11

slectvity
permeability