Certain integral membrane proteins facilitate the diffusion of molecules across the membrane without directly binding to the transported molecule. These proteins create a continuous aqueous pathway through the lipid bilayer. Which of the following is the BEST example of such facilitated diffusion?
GLUT transporters moving glucose
Sodium-potassium pump maintaining ion gradients
Aquaporins transporting water
Chloride channels gated by voltage
Related Questions
Which statement can be shared by facilitated diffusion and active transport?
    Both need carrier transporter, which are sensitive to inhibitors that reacts with protein side chains
    Energy is required by both the processes
    No energy expenditure in these processes
Both use carbohydrates to move molecules
across the membrane
    Water channels are possessed by a membrane to facilitate the movement of hydrophilic substances.
These channels are made up of
Proteins
Lipids
Carbohydrates
Nucleic acids
Active transport differs from facilitated transport as the former
Requires special membrane protein
Is highly selective
Shows response to protein inhibitors
Is ATP dependent
Facilitated diffusion involves?
Downhill transport
Without expenditure of energy
Involvement of proteins
All
What are the aquaporins in facilitated diffusion process?
    Membrane proteins
Carrier proteins
Channel proteins
Carrier lipids
Which factor does NOT influence the rate of facilitated diffusion?
The concentration gradient of the transported substance
The number of carrier proteins in the membrane
The amount of ATP available
The temperature
Facilitated diffusion differs from simple diffusion in that it:
Requires ATP
Moves substances against their concentration gradient
Requires membrane proteins
Occurs only in plant cells
    Select the wrong statement regarding membrane channels
    They are proteins
They are usually gated, i.e., may be open or closed
    All ions pass through the same type of channel
    They form a huge pore in the outer membrane of plastids, mitochondria and some bacteria
Water channels are made up of how many different types of aquaporins?
Eight
Four
Five
Twenty
Which of the following is NOT a characteristic of facilitated diffusion?
It requires specific membrane proteins.
It does not require ATP.
It is a passive process.
It moves substances against their concentration gradient.
