Multiple Choice
Which statement best describes the process of diffusion?
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6. The Membrane
Passive vs. Active Transport
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Which homeostatic process requires energy to move particles across the plasma membrane?
A
Osmosis
B
Simple diffusion
C
Facilitated diffusion
D
Active transport
Verified step by step guidance1
Step 1: Begin by understanding the concept of homeostasis, which refers to the maintenance of a stable internal environment in living organisms. The plasma membrane plays a key role in regulating the movement of particles to maintain this balance.
Step 2: Review the different types of transport mechanisms across the plasma membrane: osmosis, simple diffusion, facilitated diffusion, and active transport. Each mechanism has distinct characteristics.
Step 3: Understand that osmosis is the passive movement of water molecules across a membrane from a region of lower solute concentration to higher solute concentration, requiring no energy.
Step 4: Learn that simple diffusion and facilitated diffusion are also passive processes. Simple diffusion involves the movement of particles directly through the membrane, while facilitated diffusion uses protein channels or carriers. Neither requires energy.
Step 5: Recognize that active transport is the only process that requires energy (usually in the form of ATP) to move particles against their concentration gradient, from a region of lower concentration to higher concentration. This is essential for maintaining homeostasis in cells.
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