types of transport

Question 1

simple diffusion is a fundamental property of

Answer 1

atoms and molecules that exist in a state of random motion

Question 2

simple diffusion energy requirements

Answer 2

none

substances move on a gradient from

HIGHER to LOWER

concentration

Question 3

facilitated diffusion molecule binds to a

Answer 3

specific receptor in membrane and is carried to other side

MOLECULE-SPECIFIC

rate of transport is limited by the number of binding states on transport proteins

Question 4

facilitated diffusion energy requirements

Answer 4

none

substances move on a gradient from

HIGHER to LOWER

concentration

Question 5

active transport

Answer 5

transport of nutrients against diffusion gradient or in the same direction as the natural gradient but at a rate FASTER than by diffusion alone

Question 6

active transport is in the presence of specific

Answer 6

membrane proteins

(active transport permeases and pumps)

and

the expenditure of energy