Multiple Choice
The rate of diffusion of a substance across the plasma membrane depends on which of the following factors?
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6. The Membrane
Concentration Gradients and Diffusion
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Why is diffusion important to cells?
A
It allows for the passive movement of substances across cell membranes, maintaining homeostasis.
B
It requires energy to transport substances against their concentration gradient.
C
It prevents the movement of water molecules across cell membranes.
D
It is responsible for the active transport of ions and molecules.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration, without the need for energy input.
Recognize the role of diffusion in cells: Diffusion is crucial for cells as it allows for the exchange of substances, such as nutrients and waste products, across cell membranes, helping maintain homeostasis.
Differentiate between passive and active transport: Passive transport, like diffusion, does not require energy, whereas active transport requires energy to move substances against their concentration gradient.
Identify the importance of diffusion in maintaining homeostasis: By facilitating the movement of substances across cell membranes, diffusion helps regulate the internal environment of the cell, ensuring optimal conditions for cellular functions.
Clarify misconceptions: Diffusion does not prevent the movement of water molecules; instead, it includes processes like osmosis, which is the diffusion of water across a selectively permeable membrane.
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