Multiple Choice
Animal cells function optimally when placed in which type of solution?
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6. The Membrane
Osmosis
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In osmosis, which molecules can flow freely across the semipermeable membrane?
A
Glucose molecules
B
Water molecules
C
Sodium ions (Na^+)
D
Proteins
Verified step by step guidance1
Understand the concept of osmosis: Osmosis is the movement of water molecules across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Identify the properties of a semipermeable membrane: A semipermeable membrane allows certain molecules, typically small and uncharged ones like water, to pass through while blocking larger or charged molecules.
Analyze the options provided: Glucose molecules are too large to pass freely through the semipermeable membrane. Sodium ions (Na⁺) are charged and cannot pass freely. Proteins are large macromolecules and are also unable to pass freely.
Recognize that water molecules are small and uncharged, making them capable of freely moving across the semipermeable membrane during osmosis.
Conclude that in osmosis, water molecules are the ones that can flow freely across the semipermeable membrane, while the other molecules listed (glucose, sodium ions, and proteins) cannot.
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