Define selectively permeable membrane: Movement by two processes:
Understand the Problem
The question is asking for a definition of a selectively permeable membrane and also mentions two processes related to movement through that membrane. This indicates a focus on cell biology, specifically membrane properties and transport mechanisms.
Answer
Active transport and passive transport.
A selectively permeable membrane allows certain molecules or ions to pass through by active or passive transport.
Answer for screen readers
A selectively permeable membrane allows certain molecules or ions to pass through by active or passive transport.
More Information
Active transport requires energy to move molecules against a gradient, while passive transport allows molecules to move without energy, typically along a concentration gradient.
Tips
A common mistake is confusing active transport requiring energy with passive transport that does not.
Sources
- Selective Permeability: Definition & Function - vaia.com
- 15.3: Membrane Transport with Selective Permeability - bio.libretexts.org
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