What is facilitated diffusion ?
Answers
NCERT based Answer for Class 11 Biology Students
Facilitated Diffusion:
It is Meant for hydrophilic substances which cannot pass through membrane.
Special trans-membrane proteins help move substances across membrane without expenditure of ATP.
Concentration gradient is required for transport of substances across membrane.
Transport rate reaches a maximum when all protein transporters become saturated.
Very specific, a particular substance is transported by a particular protein.
Transporter proteins are sensitive to inhibitors.
Porins are proteins that form huge pores in outer membranes of plastids, mitochondria and some bacteria allowing molecules up to size of small proteins to pass through.
Aquaporins are water channels.
In a Symport, two type of molecules cross the membrane in the same direction.
In an antiport, two types of molecules move in opposite directions.
When a molecule moves across a membrane independent of other molecules, the process is called uniport.
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