Question

1. if a cell membrane is impermeable to substance x, which is high on the outside, what will? a. substance x will enter the cell. b. water will exit the inside of the cell, moving to the outside. c. substance x will leave the cell. d. water will enter the cell from the outside.

Explanation:

The cell membrane is impermeable to substance X, so substance X can't move across. Since substance X is high outside, the outside has a higher solute concentration (hypertonic relative to inside). By osmosis, water moves from low solute (inside, hypotonic) to high solute (outside, hypertonic) areas. So water exits the cell (inside) to outside. Option a is wrong as X can't enter. Option c is wrong as X can't leave. Option d is wrong as water moves out, not in.

Answer:

b. Water will exit the inside of the cell, moving to the outside.