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Cell in beakerDialysis bag in beaker2M Na*2M Na*2M CH2M Cl2M glucose2M starch2M glucose2M starchWaterWater7M glucose7M glucoseWaterWater3. In this question, I'm asking you to connect lecture with 204 lab! The concentrations shown in thediagram are the concentrations of the solutions at the start of an experiment.a) At the start of the experiment, what is the total molarity of the solution in the dialysis bag and thecell?b) Describe the direction of diffusion (into the bag, out of the bag, or no net movement) at the beginningof the experiment for each molecule in the dialysis bag above:c) Describe the direction of diffusion (into the cell, out of the cell, or no net movement) at the beginningof the experiment for each molecule in the cell above (note: cell membrane is a phospholipid bilayer):4. To function properly, cells must precisely regulate their internal ion concentrations. For example,the internal and external concentrations of Na and Cl are shown in the table below. Explainmechanism by which a cell could maintain specific ion concentration gradients across their membranes.InsideOutside[Na*]10 mM145 mM[ CH10 mM110 mM

Question

Please answer question number 4 at the bottom of the page. thank you 

Cell in beaker
Dialysis bag in beaker
2M Na*
2M Na*
2M CH
2M Cl
2M glucose
2M starch
2M glucose
2M starch
Water
Water
7M glucose
7M glucose
Water
Water
3. In this question, I'm asking you to connect lecture with 204 lab! The concentrations shown in the
diagram are the concentrations of the solutions at the start of an experiment.
a) At the start of the experiment, what is the total molarity of the solution in the dialysis bag and the
cell?
b) Describe the direction of diffusion (into the bag, out of the bag, or no net movement) at the beginning
of the experiment for each molecule in the dialysis bag above:
c) Describe the direction of diffusion (into the cell, out of the cell, or no net movement) at the beginning
of the experiment for each molecule in the cell above (note: cell membrane is a phospholipid bilayer):
4. To function properly, cells must precisely regulate their internal ion concentrations. For example,
the internal and external concentrations of Na and Cl are shown in the table below. Explain
mechanism by which a cell could maintain specific ion concentration gradients across their membranes.
Inside
Outside
[Na*]
10 mM
145 mM
[ CH
10 mM
110 mM
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Cell in beaker Dialysis bag in beaker 2M Na* 2M Na* 2M CH 2M Cl 2M glucose 2M starch 2M glucose 2M starch Water Water 7M glucose 7M glucose Water Water 3. In this question, I'm asking you to connect lecture with 204 lab! The concentrations shown in the diagram are the concentrations of the solutions at the start of an experiment. a) At the start of the experiment, what is the total molarity of the solution in the dialysis bag and the cell? b) Describe the direction of diffusion (into the bag, out of the bag, or no net movement) at the beginning of the experiment for each molecule in the dialysis bag above: c) Describe the direction of diffusion (into the cell, out of the cell, or no net movement) at the beginning of the experiment for each molecule in the cell above (note: cell membrane is a phospholipid bilayer): 4. To function properly, cells must precisely regulate their internal ion concentrations. For example, the internal and external concentrations of Na and Cl are shown in the table below. Explain mechanism by which a cell could maintain specific ion concentration gradients across their membranes. Inside Outside [Na*] 10 mM 145 mM [ CH 10 mM 110 mM

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Step 1

Facilitated diffusion is a process by which molecules are transported across the plasma membrane with the help of membrane proteins.

Uncharged polar molecules such as glucose are unable to cross the plasma membrane by passive diffusion, as are charged molecules of any size (including small ions such as H+, Na+, K+, and Cl-). The passage of these molecules across the membrane instead requires the activity of specific transport and channel proteins, which therefore control the traffic of most biological molecules into and out of the cell.

Step 2

Channel proteins simply form open pores in the membrane, allowing small molecules of the appropriate size and charge to pass freely through the lipid bilayer.

The opening of ion channels is regulated by “gates” that transiently open in response to specific stimuli. Some channels (called ligand-gated channels) open in response to the binding of neurotransmitters or other signaling molecules; others (voltage-gated channels) open in response to changes in electric potential across the plasma membrane.

Ligand-gated ion channels are large, multi-subunit (4 or 5 subunits) receptors that form ...

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