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Passive diffusion across lipid bilayers :
- Small apolar molecules like O2 and C02, or ethanol diffuse across the bilayer.
- Polar or charged molecules do not cross the membrane
Active transport :
- Membrane proteins, such as pores, canals, transporters, facilitators regulate diffusion across membranes.
Within membranes :
- Lipid and proteins diffuse laterally (on the membrane plane).
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoActive Diffusion uses carrier proteins; Passive Diffusion does not.
Wiki User
∙ 14y agono it allows charged molecules to pass through the cell membrane
Wiki User
∙ 11y agofacilitated diffusion does use transport proteins
Wiki User
∙ 7y agoNo; they are involved in endocytosis and active transport.
Wiki User
∙ 6y agoNo; proteins are only needed for falicitated diffusion, not normal diffusion.
Wiki User
∙ 12y agoNo
Wiki User
∙ 13y agosi
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Compare and contrast diffusion and facilitated diffusion?
They both require a trans membrane protein. Facilitated diffusion does not require energy whereas active transport requires energy. Facilitated diffusion takes place when there is a net movement of molecules from a region of high concentration to a region of low concentration whereas active transport takes place when there is a net movement of molecules from a region of low concentration to a region of high concentration.
Is the following sentence true or false Facilitated diffusion does not require the to use energy?
No. Facilitated diffusion is just diffusion through membrane proteins. But, it is still diffusion and the net movement of molecules is from high to low concentration and therefore does not require added energy. -H. C =)
Do cells gain and then use energy through facilitated diffusion?
Cells do not gain (or use) energy through facilitated diffusion.
What process the cell must use to allow the protein to enter and why?
The process the cell must use to allow the protein to enter is rather simple and uncomplicated. The cell uses the process of osmosis and diffusion along a concentration gradient to allow for passage in and out of the cell.
How is facilitated diffusion different from passive transport?
Mediated Transport has an extra step of binding to a carrier protein, while Passive transport does not bind to a protein. Both of them however, move along the concentration gradient (High--> Low)
What is the use of carrier proteins for diffusion?
facilitated diffusion.
What requires the use of energy and the help of transport proteins to move a molecule across the cell membrane?
Facilitated diffusion
What requires the use of energy and help of transport proteins to move a molecule across a cell membrane?
Facilitated diffusion
Does facilitated diffusion require the use of special membrane proteins?
no
Does facilitated diffusion require ATP?
In cells, passive diffusion is energy independent and therefore does not require ATP. This is opposed to active transport which requires either energy in the form of ATP or a charge gradient to move a molecule or ion across the membrane.
Is facilitated diffusion an active transport?
no it is not because it does not require the use of ATP
Compare and contrast diffusion and facilitated diffusion?
They both require a trans membrane protein. Facilitated diffusion does not require energy whereas active transport requires energy. Facilitated diffusion takes place when there is a net movement of molecules from a region of high concentration to a region of low concentration whereas active transport takes place when there is a net movement of molecules from a region of low concentration to a region of high concentration.
Is the following sentence true or false Facilitated diffusion does not require the to use energy?
No. Facilitated diffusion is just diffusion through membrane proteins. But, it is still diffusion and the net movement of molecules is from high to low concentration and therefore does not require added energy. -H. C =)
Do cells gain and then use energy through facilitated diffusion?
Cells do not gain (or use) energy through facilitated diffusion.
How are active transport and facilitated diffusion similar?
Both serve to transport molecules across cell membranes and both make use of proteins embedded in cell membrane in order to move these molecules.
What process the cell must use to allow the protein to enter and why?
The process the cell must use to allow the protein to enter is rather simple and uncomplicated. The cell uses the process of osmosis and diffusion along a concentration gradient to allow for passage in and out of the cell.
How is facilitated diffusion different from passive transport?
Mediated Transport has an extra step of binding to a carrier protein, while Passive transport does not bind to a protein. Both of them however, move along the concentration gradient (High--> Low)
