musicangel
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#1
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#1
Hi

I am really stuck on this. Is the table showing before or after diffusion/active transport and how can you if they move in or out, or if it is diffusion or active transport?

Thanks
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hknobody
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When the concentration outside is higher than inside of the cell, diffusion occurs.

When the concentration is higher inside of the cell and it is maintained, active transport occurred.
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rileystringer1
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#3
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(Original post by musicangel)
Hi

I am really stuck on this. Is the table showing before or after diffusion/active transport and how can you if they move in or out, or if it is diffusion or active transport?

Thanks
In diffusion, an equilibrium is eventually reached^^

So I would say A is diffusion as the concentrations are the same (inside and out)
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musicangel
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#4
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(Original post by hknobody)
When the concentration outside is higher than inside of the cell, diffusion occurs.

When the concentration is higher inside of the cell and it is maintained, active transport occurred.
Ok, thanks!
Does active transport always happen when the concentration is higher in the cell than outside the cell or are there ever any exceptions?
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Makadia
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(Original post by musicangel)
Ok, thanks!
Does active transport always happen when the concentration is higher in the cell than outside the cell or are there ever any exceptions?

Depends which way the substance in question is going, out or in the cell?
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musicangel
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#6
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(Original post by rileystringer1)
In diffusion, an equilibrium is eventually reached^^

So I would say A is diffusion as the concentrations are the same (inside and out)
Ok, so would B be active transport into the cell and would C be active transport out of the cell?
Does active transport require energy from the cell that is either taking in or removing the substance?
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L'Evil Fish
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(Original post by musicangel)
Does active transport require energy from the cell that is either taking in or removing the substance?
Yep

Need ATP
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rileystringer1
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#8
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(Original post by musicangel)
Ok, so would B be active transport into the cell and would C be active transport out of the cell?
I'd say so, yes

Does active transport require energy from the cell that is either taking in or removing the substance?
Yes, active transport works by using carrier proteins in the plasma membrane of a cell. A molecule of ATP (adenosine triphosphate) binds to the carrier protein and is broken down into ADP (Adenosine diphosphate) and inorganic phosphate. The breaking down of ATP releases energy, and this energy changes the shape of the carrier protein (molecules have attached to the carrier protein on the outside beforehand) so that the molecules attached are brought into the cell.

Open the spoiler for a basic animation of active transport. Note that the "energy" is from the break down of ATP. I hope that's clear for you now
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