Characteristics of Transport Mechanisms

Question 1

Characteristic: Membrane component responsible for transport
Simple Diffusion:
Facilitated Diffusion:
Active Transport:

Answer 1

SD: Lipids
FD: Proteins
AT: Proteins

Question 2

Characteristic: binding of transported substance
Simple Diffusion:
Facilitated Diffusion:
Active Transport:

Answer 2

SD: no
FD: yes
AT: yes

Question 3

Characteristic: energy source
Simple Diffusion:
Facilitated Diffusion:
Active Transport:

Answer 3

SD: concentration gradients
FD: concentration gradients
AT: atp hydrolysis or concentration gradients

Question 4

Characteristic: direction of transport
Simple Diffusion:
Facilitated Diffusion:
Active Transport:

Answer 4

SD: with gradient of transported substance
FD: with gradient of transported substance
AT: against gradient of tranported substance

Question 5

Characteristic: specificity for molecules or molecular classes
Simple Diffusion:
Facilitated Diffusion:
Active Transport:

Answer 5

SD: nonspecific
FD: specific
AT: specific

Question 6

Characteristic: saturation at high concentrations of transported molecules
Simple Diffusion:
Facilitated Diffusion:
Active Transport:

Answer 6

SD: No
FD: Yes
AT: Yes