Can facilitated diffusion sometimes move against their concentration gradients?

Expert Solution

Facilitated diffusion is similar to passive diffusion in that solutes move along the concentration gradient.But it differs from passive diffusion in that it requires a carrier or transport protein. Hence the rate of diffusion is faster than simple diffusion.The process does not require any energy and can operate bidirectionally.

Incase of glucose, hence it diffuses across membranes through facilitated diffusion, down the concentration gradient.It transported against the concetration gradient by a dependent glucose symporter which provides a driving force to other glucose molecules in the cells. Since glucose is a large molecule, it is difficult to be transported across the membrane through simple diffusion.

(In case of intestinal absorption of glucose a membrane bound carrier protein is involved, which carries glucose, along with sodium.This sodium is later expelled by the sodium pump with utilization of energy. So energy is needed indirectly)

gladiator answered 2 years ago

1.Define facilitated diffusion. Compare and contrast diffusion and facilitated diffusion. a.Give an example of a molecule...

1.Define facilitated diffusion. Compare and contrast diffusion and facilitated diffusion. a.Give an example of a molecule that crosses the membrane using this mechanism.

What does the word facilitated mean in facilitated diffusion

answer all question thoroughly for good rating Experiment 2 Diffusion - Concentration Gradients and Membrane Permeability...

**answer all question thoroughly for good rating** Experiment 2 Diffusion - Concentration Gradients and Membrane Permeability Experiment Inventory Materials 10 mL 1% Glucose Solution, C6H12O6 4 mL 1% Iodine-Potassium Iodide (IKI) 5 mL Liquid Starch, C6H10O5 4 Glucose Test Strips 4 Small Rubber Bands (Latex Warning: Handle with gloves on if allergic.) *Permanent Marker *Water *Scissors *Paper Towels *Stopwatch/Timer Labware (5) 100 mL Beakers 6 Pipettes Ruler 100 mL Graduated Cylinder **15.0 cm Dialysis Tubing **Be sure to measure and...

1:Phloem requires facilitated diffusion to move sugars and other dissolved molecules in any direction. A:True B:False...

1:Phloem requires facilitated diffusion to move sugars and other dissolved molecules in any direction. A:True B:False 2:Which of the following mechanisms correctly describes how signals are passed between two neurons? A:Terminal buds release neurotransmitter that travel across the synapse to connect with membrane receptors on the dendrites of another neuron B:An electrical signal passes from the terminal buds of one neuron to the dendrites of another neuron. C:An electrical signal passes from the dendrites of one neuron to the terminal...

What are the differences and similarities of “passive diffusion”, “facilitated diffusion” and “active transport”? What is...

What are the differences and similarities of “passive diffusion”, “facilitated diffusion” and “active transport”? What is endocytosis? Explain. What are the different types of endocytosis? What is exocytosis? Explain.

1. Describe simple and facilitated diffusion in passive transport? a. simple diffusion b. facilitation diffusion 2....

1. Describe simple and facilitated diffusion in passive transport? a. simple diffusion b. facilitation diffusion 2. Describe osmosis?

Describe how facilitated diffusion affects free energy change compare to simple diffusion

Compare osmosis, simple diffusion, facilitated diffusion and active transport: A) describe their differences and B) explain...

Compare osmosis, simple diffusion, facilitated diffusion and active transport: A) describe their differences and B) explain when cells have to use each one.

TRUE OR FALSE 1. For facilitated diffusion to occur there needs to be a protein in...

TRUE OR FALSE 1. For facilitated diffusion to occur there needs to be a protein in the cell membrane 2. Ions like Na+ and K+ can easily move across the cell membrane 3. Cells may have a cell membrane and not cell wall 4. An atom with 17 electrons meets the octet rule 5. Attaching to the allosteric site of an enzyme means that inhibitor molecules will increase the Km in an enzymatic reaction

Name two ways cells are able to move molecules against their concentration gradient. What is this...

Name two ways cells are able to move molecules against their concentration gradient. What is this type of transport called and is it possible to move molecules against their concentration gradient without using ATP?

Question