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Why would the movement of water through cell walls be considered the apoplast and symplast pathway? I understand why it's considered the apoplast pathway (as the water is moving through a non-living ...
I am a high school student and I am very confused in how we define osmotic pressure?
Osmotic pressure is defined as the pressure required to stop the diffusion of solvent into a solution by applying ...
I am a high school student and I am a little confused in plasmolysis,
when we study plasmolysis, we say that at limiting plasmolysis, the turgor pressure OR pressure potential reduces to 0 what do we ...
So my understanding of water flow is as follows:
Basically, water moves about randomly because it has thermal energy. It will occasionally hit other water molecules and "bounce" back. As ...
When these quantities are mentioned with what reference do we give signs to them?
Why is Osmotic Pressure positive, but Osmotic Potential, negative?
What about Turgor Pressure (Pressure exerted by the ...
Unlike the plasma, the ultrafiltrate has no proteins which are prevented from filtering out. Shouldn't the loss of these proteins result in a loss of oncotic pressure and thus a different overall ...
My textbook says this:
Osmosis is the diffusion of water.
Wikipedia says this:
The diffusion model of osmosis is rendered untenable by the fact that osmosis can drive water across a membrane toward ...
For example, There is a sugar solution with concentration $A_{1}$, how to determine the concentration of a NaCl solution which produce same osmotic pressure as the previous sugar solution toward ...
I'm currently reading the book, "An Introduction to Nervous Systems" by Ralph J. Greenspan.
On page 20, there is a sentence that confused me. It was, "Electrical signaling has the advantage of being ...
The concentration of water outside potatoes B and C is more than the concentration of water inside the potatoes. So water will flow inside the potato. Now, since the concentration of water in the ...
Water can move across the (Semipermeable non polar lipid) membrane by simple diffusion (osmosis).
But polar molecules cannot pass through the non polar lipid bilayer, they require carrier proteins to ...
If I place a RBC in 0.5M urea we see haemolysis.
My textbook says that "the solution is hypotonic. Urea enters the RBC down it's concentration gradient. Water follows the movement of urea by osmosis. ...
Hi there,
For the first picture: can someone please explain in simple terms (I started learning biology a few days ago), why the answer to this osmosis question is no?
For the second picture: The ...
As a teacher of high school and introductory college chemistry, I used textbooks that defined osmosis as a flow of water (only) through a membrane that prevents other substances such as dissolved ...
I had assumed that the preservative function of covering foods with NaCl or brine was due to osmosis killing the microorganisms on the food by dehydration. However, I am now wondering to what extent ...
My textbook states that the higher concentration of solutes, the greater the osmotic pressure will be and the greater the pull of water in will be. However, osmotic pressure is defined "as the ...
So the closer a solution's solute potential is to zero, the more water potential said solution would eventually have. The solute potential equation is -iCRT. If the temperature is 0, -iCRT would be ...
I know osmosis is the reason for the water to come out of cells - When you sprinkle salt over a leech, it creates concentration gradient and forces the water out of the cells. But why does a lot of ...
This is a question from an exam in my biology course.
Bacterial cells and human red blood cells were inserted into one solution. Upon testing one hour later the blood cells exploded, while the ...
We know that if we keep plant cells in water, they don't burst because of a cell wall. But the cells of aquatic animals lack cell walls but they still survive. Why?
In this diagram, D is apparently the point at which "the osmotic pressure into the capillaries is the greatest", but I cannot figure out why. Any help would be much appreciated!
I have a question about osmosis that goes a bit deeper than most basic textbooks so I cannot find the answer.Here's the problem:
Imagine an animal cell, say a red blood cell, in a slightly hypotonic ...
Given that bacteria are hypertonic (contain more salts) compared to distilled water, and that they rely on ion concentration differences across the plasma membrane to survive, can I kill a bacterial ...
This has been bugging me for a while, and I can't seem to find an answer to it, and I am sorry if I am asking a lot with this question(s). Firstly, I keep finding sources suggesting that ethanol is ...
I know saltwater fishes can't survive in freshwater because of osmosis that water would rush into the body of fishes. How about sugar solution? Does sugar solution provide similar conditions as salt ...
Earlier today, I undertook an exam which featured a question regarding the stickiness of mucus in a person diagnosed with CF's. We had to explain why they had stickier mucus than a 'normal' person, ...
Fish receive oxygen needed from water that passes through their gills. If fish were isotonic to their watery environment, what problems would this pose to them?
Why do the guard cells of the stomata close when they come in contact with salt water?
I recognize it has something to do with osmosis and the fact that osmosis makes the water drain in some sort, ...
Does 1M NaCl or 1M sucrose solution have a more negative solute potential?
I was thinking that for the same volume of solution, (eg 1 dm^3) there will be 2 mol of ions in NaCl solution and 1 mol of ...
When I normally think of high pressure, I think of it as pushing something away from the zone of high pressure.
Yet for a high osmotic pressure, water is pulled IN to this high osmotic pressure ...
Why do people say that water moves into the cell because the water concentration of the cell sap is low ? the cell sap is surrounded by a membrane so if any water moves into the cell it must be ...
Well my question is based on this question down below.
For those who don't speak german:
You have two potato slices one of them is boiled the other one is just raw.
Now you scatter some salt over ...
Sentence:
The aquaporins allow water to pass through the membrane and imperviate any solute molecules from diffusing across.
I'm looking for a word that pretty much is the opposite of perviate or to ...
I found an explanation for my question here http://www.pitara.com/science-for-kids/5ws-and-h/why-do-we-have-wrinkly-fingers-after-swimming/, which suggests that water washes out sebum (special oil, ...
I recently read that penicillin works by damaging the peptidoglycan layers of a bacterial cell wall causing osmotic lysis, which is when the bacteria cell bursts due to osmotic pressure.
I just ...
After discussing this with some colleagues, I devised the theory that you could drink more coca-cola in a single sitting than you could water, without killing you.
Defining the volume it would take ...
I was thinking about lysosomes and how they maintain an acidic pH inside themselves by pumping H+ ions from the cytosol. Do hydrogen ions set up a concentration gradient that causes water to move by ...
I just wanted to ask, why is the oncotic pressure more negative in the blood plasma even though the hydrostatic pressure is higher since the blood comes from the pumping of the heart?
Distilled water is pure and it does not contain any minerals, so may not be advisable for drinking.
Although laboratory made distilled water is completely pure, industry made water may still contain ...
Why is bread swelling up when placed in water not considered to be caused by osmosis?
Is there a property of water that should make it leave the bread instead of enter?
We're learning about osmoregulation in AP Biology and the terms Tonicity and Osmolarity are really confusing me. I watched this video on Khanacademy to try to understand what the difference is, and ...
In my biology class we got the question if saltwater fish need to drink. We need to use the term osmosis, but I cannot think of a valid answer and we were allowed to ask help.
For example, I do know that red blood cells have both the Na+/Cl- co-transporter and Aquaporin (water channel) that allows both Na/Cl and water molecules to pass through. But why in biology textbooks ...
For marine vertebrates, the concentration of salts outside their body (in the water, that is) is more than that inside their body. So, there is a natural tendency for exosmosis to occur.
To minimise ...
Is it true that in an enzyme-catalyzed reaction, the rate of reaction does not vary with varying osmotic pressure?
Instead of just a true or false answer, why does it, or why does it not vary with ...
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