I have my Bio SAC tomorrow on the plasma membrane. We did an experiment with dialysis tubing. We put a dialysis tube filled with Solution A (containing glucose, starch, Na+ and Cl-, and proteins) into a beaker of distilled water and let it sit for 30 minutes. Before that, we tested the concentration of the glucose, starch, Na+ and Cl-, and protein both inside and outside the tube. After 30 minutes we tested it again.
So this was the experiment we did.
Anyone have any idea what sort of questions could be asked about this?
When I had a similar SAC back last year there were questions about :
-hypothesis
-explaining the results (that is , using words such as osmosis etc)
- Variables (controlled, independent and dependent)
- Which is the controlled group and which is the experimental?
Basically things like that
Another question... Can anyone lost what substances diffuse into and out of human cells through: a) active transport b) simple diffusion and c) facilitated diffusion.
Thanks again guys!!! 😊
I cant really list every substances that goes through using these methods because I don't know , but if a question were to come up it would hint to you something about the structure that you could use to decide which method.
Eg: if it were saying that the substance is large and hydrophilic and it was going along the concentration gradient , you would know that it must undergo facilitated diffusion.
But nonetheless I will tell you the main things with some examples
-Simple diffusion : small molecules , hydrophobic/lipophilic, uncharged, nonpolar (eg: O2 , urea)
- Facilitated diffusion: large molecules , hydrophilic/ lipophobic , charged , polar
-Active transport :for this one , it is ANYTHING going against the concentration gradient
Why does adding methylene blue stain allow us to view cells more clearly?
Thank you.
Idk if you mean how stains work, in which case am pretty sure that you don't need to know . But if you mean why we stain things it mainly cause most organelles are colourless/ transparent so you need to stain them to actually see them and make them distinct from the rest of the cell.