science
Grade-10
Easy
Question
Each of the following membrane transport system demands the use of specific proteins that let the movement through the plasma membrane EXCEPT __________.
- Primary active transport system
- Simple diffusion
- Secondary active transport system
- Facilitated transport through channels
Hint:
The simple diffusion does not require energy and does not involve any membrane proteins.
The correct answer is: Primary active transport system
- The active transport of molecules across the membrane is carried by membrane proteins.
- The primary, secondary, and facilitated active transports are carried out by the proteins as they need energy from ATP.
- The simple diffusion takes place through the lipid bilayer which does not need energy.
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