Question 2 of 10
Which statement best describes the movement of materials across a cell
membrane using active transport?
C
P
O A. They move back and forth to keep both concentrations at zero.
OB. They move from an area of higher concentration to an area of
lower concentration.
O C. They move back and forth randomly between areas of different
concentrations.
OD. They move from an area of lower concentration to an area of
higher concentration.