Multiple Choice
During osmosis across a selectively permeable membrane, which molecule does NOT move across the membrane (assuming only water can pass)?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport and osmosis, what is crenation of a cell?
A
Swelling and bursting of an animal cell due to net water gain when placed in a hypertonic solution
B
Shrinking of an animal cell due to net water loss when placed in a hypertonic solution
C
Movement of solutes from low concentration to high concentration across a membrane without energy input
D
Equal rates of water movement into and out of a cell when placed in a hypotonic solution, causing no change in cell size
Verified step by step guidance1
Step 1: Understand the concept of osmosis, which is the passive movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Step 2: Recognize that a hypertonic solution has a higher solute concentration outside the cell compared to the inside, causing water to move out of the cell.
Step 3: Know that when water leaves an animal cell placed in a hypertonic solution, the cell loses volume and shrinks.
Step 4: Define crenation as the shrinking or shriveling of an animal cell due to net water loss when placed in a hypertonic solution.
Step 5: Differentiate crenation from other phenomena such as swelling (which occurs in hypotonic solutions) and equal water movement (which occurs in isotonic conditions).
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