Multiple Choice
Movement of water across a membrane is facilitated by proteins called _______:
11. Biological Membranes and Transport
Facilitated Diffusion
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What type of transport does not require the assistance of a membrane protein?
A
Simple diffusion.
B
Facilitated diffusion.
C
Passive transport.
D
Symport of more than one molecule.
E
All of the above require a protein.
Verified step by step guidance1
Understand the different types of transport mechanisms across cell membranes: simple diffusion, facilitated diffusion, passive transport, and symport.
Simple diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy or assistance from membrane proteins.
Facilitated diffusion, although passive, requires the help of membrane proteins to transport molecules across the cell membrane.
Passive transport is a broad term that includes both simple diffusion and facilitated diffusion, but it does not require energy input.
Symport involves the simultaneous transport of two different molecules across the membrane, typically requiring a protein to facilitate this process.
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