Explain the difference between simple and facilitated diffusion. This is a hw question Why is simple diffusion the only possible mechanism of potential movement of molecules across the dialysis membrane in experiment 2? 4. If the potato strip gained mass, was it incubated in an isotonic, hypotonic, or hypertonic solution?5. On your graph, at what sucrose molarity did the best fit line cross the zero percentage change inmass?At this sucrose concentration, were the potato cells isotonic, hypotonic, or hypertonic to thesolution?6. Based on your graph, what is the osmolarity of the potato?Experiment 2. Diffusion: Diffusion of molecules down their concentration gradient can bedemonstrated using dialysis tubing for a membrane. Dialysis tubing has pores of somewhat uniform sizeand is selectively permeable based on the size of the molecule. The permeability of the dialysismembrane will be tested using three different sized molecules: glucose (a monosaccharide), starch (apolysaccharide), and iodine (I2KI). These three molecules were chosen not only because they are highlyvariable in molecular weight, but also because their location can readily be determined using theBenedict's and iodine tests for reducing sugar and starch, respectively. Benedict's reagent reacts withreducing sugars (such as glucose) and, if heated, the color changes from the bright, royal blue of thereagent to cloudy green, yellow, orange, or reddish brown (depending on the concentration of sugar). If41

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Explain the difference between simple and facilitated diffusion. This is a hw question Why is simple diffusion the only possible mechanism of potential movement of molecules across the dialysis membrane in experiment 2?

4. If the potato strip gained mass, was it incubated in an isotonic, hypotonic, or hypertonic solution?
5. On your graph, at what sucrose molarity did the best fit line cross the zero percentage change in
mass?
At this sucrose concentration, were the potato cells isotonic, hypotonic, or hypertonic to the
solution?
6. Based on your graph, what is the osmolarity of the potato?
Experiment 2. Diffusion: Diffusion of molecules down their concentration gradient can be
demonstrated using dialysis tubing for a membrane. Dialysis tubing has pores of somewhat uniform size
and is selectively permeable based on the size of the molecule. The permeability of the dialysis
membrane will be tested using three different sized molecules: glucose (a monosaccharide), starch (a
polysaccharide), and iodine (I2KI). These three molecules were chosen not only because they are highly
variable in molecular weight, but also because their location can readily be determined using the
Benedict's and iodine tests for reducing sugar and starch, respectively. Benedict's reagent reacts with
reducing sugars (such as glucose) and, if heated, the color changes from the bright, royal blue of the
reagent to cloudy green, yellow, orange, or reddish brown (depending on the concentration of sugar). If
41

Expert Solution

Step 1

Simple diffusion and facilitated diffusion are the same in which transport of substances occurs through the concentration gradient.

In Simple diffusion,the transported substances are mainly non polar molecules which can pass through the phospolipids of the plasma membrane.

In facilitated diffusion,the transported substances pass through the plasma membrane through specialied membrane channels along the concentration gradient and these are mainly like glucose,Sodium ions, Potassium ions etc..

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