Multiple Choice
The rate of facilitated diffusion of a molecule across a membrane will increase as the concentration gradient of the molecule across the membrane increases to a certain point. Eventually, an increase in the concentration of the molecule will not cause any further increase in facilitated diffusion. Thus, there is a maximal rate of facilitated diffusion. This is because
A) the diffusion constant depends on the concentration gradient.
B) the increased concentration gradient causes a situation far from equilibrium.
C) there are a limited number of carrier proteins in the membrane.
D) as the concentration gradient increases, molecules interfere with one another.
E) facilitated diffusion requires ATP energy.
Correct Answer:
Verified
Correct Answer:
Verified
Q27: Osmosis is the diffusion of water molecules
Q55: What happens when diffusion moves molecules across
Q56: A freshwater protozoan, such as Paramecium, tends
Q58: The electrical signal for a muscle to
Q60: Carbon dioxide crosses the plasma membrane by
Q61: Specialized cell junctions include all of the
Q62: For diffusion to occur, there must be<br>A)
Q64: The process in which white blood cells
Q68: Suppose a bag made of a selectively
Q86: _is used by white blood cells to