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
What happens to the rate of facilitated diffusion as the concentration of the transported molecule increases?
It increases linearly
It decreases
It reaches a maximum rate (saturation)
It remains constant
    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
Facilitated diffusion is different from simple diffusion because it:
Moves molecules against the concentration gradient
Uses carrier proteins
Requires ATP
Occurs only in plant cells
In facilitated diffusion, saturation occurs when:
The concentration gradient disappears.
All carrier proteins are occupied by the transported substance.
The cell runs out of ATP.
The temperature decreases significantly.
Active transport differs from facilitated transport as the former
Requires special membrane protein
Is highly selective
Shows response to protein inhibitors
Is ATP dependent
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
Which of the following is not correct regarding carrier molecules, involved in facilitated diffusion?
It helps in transporting molecules down the concentration gradient.
It is specific.
It is saturable.
It requires energy input.
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.
    Which of the following pair is selective and specific mode of transport?
    Passive transport and active transport
    Passive transport and facilitated diffusion
Facilitated diffusion and active transport
    Simple diffusion and facilitated diffusion
