Questions tagged [membrane]

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Plasma Membrane Proteins and Cytoskeletal Attachment

Regarding membrane protein functions, which of the following statements is CORRECT? a. Membrane proteins are responsible for both cell to cell recognition and cell anchoring and are ...
6
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2answers
196 views

How do membrane proteins find their target locations?

The question might be asked for any kind of "bound" proteins, but I'd like to restrict it to membrane proteins. Assuming membrane proteins (or their main parts) don't (or aren't) build in situ but at ...
5
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1answer
417 views

Rate of Diffusion Through Cellulose Membrane

From what I understand, the larger the molecular size, the slower the rate of diffusion and vice versa. However, after doing a lab (similar to this one) about diffusion through a cellulose membrane, ...
0
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1answer
337 views

Why does the mass increase in this question? [closed]

So, on 'http://filestore.aqa.org.uk/sample-papers-and-mark-schemes/2016/june/AQA-BL3HP-QP-JUN16.PDF', question 1.b., they show a partially permeable bag of glucose solution, in a less concentrated ...
3
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0answers
53 views

Movement of few ion during changes in membrane potential

My question is very simple: why is it sufficient for a very few ions (such as 1 in 100000 K+) to move across the membrane to generate a remarkable variation in the membrane potential (like a change of ...
1
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1answer
645 views

Why are the walls of the bronchioles folded?

The bronchiole shown in the section above has folded epithelium, why is this so?
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0answers
86 views

Potentials between endolymph/cytoplasm and endolymph/perilymph

I am studying for an exam and there is something I can't seem to understand. My textbook says that the endolymph contains 150mM potassium, 2mM Na+ and 130mM Cl-. The perilymph contains 5mM potassium, ...
2
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0answers
45 views

Potential between endolymph/cytoplasm and endolymph/perilymph [closed]

I am studying for an exam and there is something I can't seem to understand. My textbook says that the endolymph contains 150mM potassium, 2mM Na+ and 130mM Cl-. The perilymph contains 5mM potassium, ...
6
votes
1answer
114 views

Do free computer programs exist that can simulate drug permeability in bacterial membranes?

I am currently trying to make derivatives of a molecule in hopes of making it more permeable to bacterial membranes. I wanted to know whether there are any bacterial membrane simulating programs where ...
1
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2answers
1k views

Difference between water and tea [duplicate]

My friend heard that tea is worse for drinking than water because "cells have a special membrane and tea has special supplements and membrane doesn't let tea pass and this is why skin is dry even when ...
1
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0answers
81 views

Effect of increasing Extracellular Na+ Concentration on resting voltage and likelihood of an action potential of occuring

If you increase the extracellular Na+ concentration how will this effect the resting voltage and likelihood that an action potential of will occur? Please explain using the Goldman–Hodgkin–Katz ...
2
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1answer
2k views

When does DIFFUSION occur and not OSMOSIS, and the otherwise?

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 ...
5
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1answer
2k views

How do nuclear membranes form during Telophase of Mitosis/Meiosis?

During Telophase, homologous chromosome pairs reach the poles of the cell with the help of microtubules. From there, nuclear membranes form around each new set of chromosomes. My confusion originates ...
1
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1answer
40 views

Ways to cause membrane damage to microalgae and yeast?

I am researching a way to monitor the membrane damage of cells. To do that I fist have to have reference points, namely, cells with damaged membranes. I am working with Dunalliela, Hematococcus (both ...
4
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1answer
431 views

Do cell membranes have more phospholipids in one layer than in the other?

Assuming the cell membrane to have a spherical shape, geometry tells us that the area of the inner leaflet is smaller than the area of the outer due to the difference in radius between them. Does this ...
3
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0answers
79 views

Can the Donnan effect be reversed so phospholipids follow ions? [closed]

I know that there are flipases and flopases that facilitate this sort of thing, but I'm curious about other possible influences. Can the Donnan effect be reversed so that phospholipids follow ions? ...