Multiple Choice
Which option best defines osmosis in the context of passive transport across biological membranes?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport across a selectively permeable membrane, what is the diffusion of water called?
A
Endocytosis
B
Active transport
C
Osmosis
D
Facilitated diffusion
Verified step by step guidance1
Step 1: Understand the context of the problem, which is about passive transport across a selectively permeable membrane. Passive transport means substances move without the use of cellular energy (ATP).
Step 2: Recall the definitions of the given options: Endocytosis is an active process involving the engulfing of materials by the cell membrane; Active transport requires energy to move substances against their concentration gradient; Facilitated diffusion is passive transport using protein channels for molecules that cannot diffuse freely.
Step 3: Focus on the movement of water specifically. Water moves across membranes by passive transport through a process called osmosis.
Step 4: Define osmosis as the diffusion of water molecules from an area of lower solute concentration to an area of higher solute concentration through a selectively permeable membrane.
Step 5: Conclude that among the options, osmosis correctly describes the passive transport of water across a membrane.
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