DIRECTIONS: Choose the letter of the answer choice that best answers the question.
1. During diffusion, molecules tend to move in what direction?
A. the molecules involved in diffusion never move
B. in a direction that doesn't depend on the concentration gradient
C. from an area of lower concentration to an area of higher concentration
D. from an area of higher concentration to an area of lower concentration
2. Ion channels aid the movement of which substances?
F. ions across a cell membrane
G. water across a cell membrane
H. molecules up a concentration gradient J. carrier proteins within the lipid bilayer
3. The sodium-potassium pump transports which of the following?
4. Which process do some animal cells use to engulf, digest, and destroy invading bacteria?
INTERPRETING GRAPHICS: The graph below shows the rate of glucose transport across a cell membrane versus the concentration gradient. Use the graph that follows to answer the question.
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