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                <OTText id="c681a52a-80f9-11dd-bad5-09cdf914a186" text="&#xA;After looking at the path taken by several red dye molecules, their motion can best be described as:" />
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                <OTText id="c6846451-80f9-11dd-bad5-09cdf914a186" text="&#xA;It is often stated that substances diffuse from highly concentrated areas to areas of low concentration. Describe how this works if a molecule can't tell that it is in a region of high concentration and just diffuses randomly through collisions." />
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                <OTText id="f6b48335-80f9-11dd-bad5-09cdf914a186" text="&#xA;Set up the model so that there is a high concentration of something outside and a low concentration of that same thing inside. What are the chances that a molecule will move into or out of the cell?" />
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                    <OTText text="There is a greater chance that a molecule will move from the lower concentrated area to the higher concentrated area." />
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                <OTText id="f6b4d15b-80f9-11dd-bad5-09cdf914a186" text="&#xA;Describe the flow of molecules when there is an area of high and low concentration." />
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                    <OTText text="Molecules move from the side with high concentration to low concentration." />
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                    <OTText text="The flow will be equal in both directions regardless of the starting concentrations." />
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                <OTText id="f8aea592-80f9-11dd-bad5-09cdf914a186" text="&#xA;What is true of the concentrations when equilibrium has been reached?" />
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                <OTText id="f8aef3b9-80f9-11dd-bad5-09cdf914a186" text="&#xA;What is true of the rate at which molecules move into and out of the cell at equilibrium?" />
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                    <OTText text="More move into the cell than out of it." />
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                    <OTText text="They move randomly, so it is not predictable." />
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                <OTText id="f8af68f0-80f9-11dd-bad5-09cdf914a186" text="&#xA;Set up the model so that it is NOT in equilibrium. Then use the &quot;snapshot&quot; button below the model to take a picture of your setup. The use the &quot;open&quot; button below to place that image here." />
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                <OTText id="f8b1d9f3-80f9-11dd-bad5-09cdf914a186" text="&#xA;Set up the model so that it is IN equilibrium. Then use the &quot;snapshot&quot; button below the model to take a picture of your setup. The use the &quot;open&quot; button below to place that image here." />
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            <OTQuestion id="fa699c15-80f9-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page4.cml">
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                <OTText id="fa699c16-80f9-11dd-bad5-09cdf914a186" text="&#xA;What happens to the oxygen concentration of the cell when you move it to a new environment?" />
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                <OTChoice id="fa699c17-80f9-11dd-bad5-09cdf914a186" selectionUI="0">
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                    <OTText text="It stays the same." />
                    <OTText text="It goes up." />
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                <OTText id="fa69ea3d-80f9-11dd-bad5-09cdf914a186" text="&#xA;Explain how a red blood cell delivers oxygen from your lungs to the rest of your body. hint" />
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            <OTQuestion id="fc12df50-80f9-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page5.cml">
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                <OTText id="fc12df51-80f9-11dd-bad5-09cdf914a186" text="&#xA;Describe what happens when the red blood cell contains hemoglobin:" />
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                    <OTText text="It is the same as without hemoglobin." />
                    <OTText text="It speeds up the normal diffusion." />
                    <OTText id="fc12df55-80f9-11dd-bad5-09cdf914a186" text="It causes the concentration of oxygen to be higher inside the cell when equilibrium has been reached." />
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                <OTText id="fc132d78-80f9-11dd-bad5-09cdf914a186" text="&#xA;Explain how hemoglobin helps transport more oxygen than could normally be done with simple diffusion:" />
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                <OTText id="fc132d7a-80f9-11dd-bad5-09cdf914a186" />
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            <OTQuestion id="fdfcfc1b-80f9-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page6.cml">
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                <OTText id="fdfcfc1c-80f9-11dd-bad5-09cdf914a186" text="&#xA;How does surface area affect diffusion rates?" />
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                    <OTText text="Surface area has no effect on diffusion rate." />
                    <OTText text="Smaller surface area = faster diffusion rate." />
                    <OTText text="Larger surface area = slower diffusion rate." />
                    <OTText id="fdfd2331-80f9-11dd-bad5-09cdf914a186" text="Larger surface area = faster diffusion rate." />
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            <OTQuestion id="fdfd7152-80f9-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page6.cml">
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                <OTText id="fdfd7153-80f9-11dd-bad5-09cdf914a186" text="&#xA;Single celled organisms absorb everything they need directly through their &quot;skin,&quot; their cell membrane. However, you could never get enough oxygen if oxygen could only diffuse through your skin. Explain why it is necessary to have lungs with large surface areas:" />
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            <OTQuestion id="ffa6db96-80f9-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page7.cml">
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                <OTText id="ffa6db97-80f9-11dd-bad5-09cdf914a186" text="&#xA;Take an image showing a side view of an aquapore poking out of boths sides of a piece of cell membrane. (Note: You will need to find the right scene on the molecule tour and rotate the molecule yourself to get the correct image.) " />
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                <OTText id="ffa729ba-80f9-11dd-bad5-09cdf914a186" text="&#xA;Take an image showing water going through the channel formed by the aquapore:" />
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            <OTQuestion id="ffa777dc-80f9-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page7.cml">
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                <OTText id="ffa777dd-80f9-11dd-bad5-09cdf914a186" text="&#xA;Which are the only types of molecules that pass easily through the cell membrane?" />
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                    <OTText text="positive ions" />
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                    <OTText text="small polar molecules" />
                    <OTText text="medium sized polar molecules" />
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            <OTQuestion id="ffa86244-80f9-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page7.cml">
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                <OTText id="ffa86245-80f9-11dd-bad5-09cdf914a186" text="&#xA;What is true of most naturally occuring pores?" />
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                    <OTText text="They allow only ions to pass through." />
                    <OTText text="They allow most molecules to pass through." />
                    <OTText text="They let anything that is the right size through." />
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                <OTText id="01ea8a1c-80fa-11dd-bad5-09cdf914a186" text="&#xA;Osmotic pressure is related to salt concentrations (or other dissolved substances) in what way?" />
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                    <OTText id="01ea8a1e-80fa-11dd-bad5-09cdf914a186" text="High concentrations cause high osmotic pressures." />
                    <OTText text="Low concentrations cause high osmotic pressures." />
                    <OTText text="High concentrations cause low osmotic pressures." />
                    <OTText text="It depends on what is dissolved in the water." />
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            <OTQuestion id="01ead842-80fa-11dd-bad5-09cdf914a186" name="http://ri-itest.concord.org/SAMActivities/DiffusionActiveTrans/DiffusionActiveTrans_v1/page8.cml">
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                <OTText id="01ead843-80fa-11dd-bad5-09cdf914a186" text="&#xA;If you want water to flow out of the cell faster than into the cell you should:" />
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                    <OTText text="put the cell in pure distilled water." />
                    <OTText text="put the cell in a low concentration of salt or sugar water." />
                    <OTText id="01eaff57-80fa-11dd-bad5-09cdf914a186" text="put the cell in a high concentration of salt or sugar water." />
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                <OTText id="01eb2669-80fa-11dd-bad5-09cdf914a186" text="&#xA;Cells generally stay in equilibrium with their surroundings. What are two ways you know the cell has reached equilibrium?" />
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                    <OTText text="Water stops flowing into and out of the cell." />
                    <OTText id="01eb266c-80fa-11dd-bad5-09cdf914a186" text="The concentrations inside and outside of the cell are the same." />
                    <OTText id="01eb266d-80fa-11dd-bad5-09cdf914a186" text="The osmotic pressure inside and outside of the cell is the same." />
                    <OTText text="The cell gets as small as it possibly can." />
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                <OTText id="01eb4d80-80fa-11dd-bad5-09cdf914a186" text="&#xA;Describe the similarities and differences between diffusion and osmosis." />
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