Multiple Choice
In passive transport, diffusion causes molecules to move in which direction?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport, osmosis is the movement of which molecule across a selectively permeable membrane?
A
Sodium ions ()
B
Water ()
C
Glucose
D
Oxygen ()
Verified step by step guidance1
Understand the concept of passive transport, which is the movement of molecules across a membrane without the use of cellular energy (ATP).
Recognize that osmosis specifically refers to the movement of water molecules across a selectively permeable membrane.
Recall that a selectively permeable membrane allows certain molecules to pass through while blocking others, often allowing water but restricting solutes like ions or large molecules.
Identify that sodium ions (Na⁺), glucose, and oxygen are different types of molecules, but osmosis is not the movement of these molecules; instead, it is the movement of water (H₂O).
Conclude that in osmosis, water moves from an area of lower solute concentration to an area of higher solute concentration to balance solute levels on both sides of the membrane.
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