6 votes
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How do membrane proteins find their target locations?

This is a great question. A comprehensive answer would be beyond the scope of an answer on a forum like this. I will summarize the best I can here, but if you are really interested in this you should ...
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  • 176
3 votes
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Do cell membranes have more phospholipids in one layer than in the other?

Yes there is a difference in the number of phospholipid molecules because of the curvature. This is very evident when there is a lot of bending as in case of exocytosis (see here) but otherwise I do ...
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3 votes
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How are Current Sources and Sinks for Postsynaptic Potentials defined?

Sinks and sources just refer to the sign of the local field potential measured with extracellular electrodes. Excitation involves positive charges entering cells, depolarizing them. When positive ...
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3 votes

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

I currently work alongside many biologists that are working on simulations of anti-microbial peptides in the membrane. These seem to have a similar mechanism to what you're aiming for — ...
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2 votes

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

According to this book, during disassembly of the nuclear envelope, the nuclear membranes are broken down into vesicles. The nuclear membranes reform at the end of mitosis as the vesicles bind to the ...
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2 votes
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Difference between water and tea

Your question is very awkward. Let's define Tea as boiling leaves in water. At the end, you remove the leaves and drink the flavoured water. At this point, the "tea" is still very much water - as in ...
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  • 246
2 votes

Are there any drugs that target the lipid envelope of viruses?

The lipids in the viral envelope come from chunks of the host cell membrane. Therefore, something targeting those lipids is unlikely to be virus-specific, and not suitable for use in a living animal. ...
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2 votes
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Rate of Diffusion Through Cellulose Membrane

I think that your instructor was wrong. For the type of experiment that you describe the dialysis tubing (cellulose acetate with pores) is acting as a semi-permeable membrane which can block the ...
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1 vote

Number of membrane proteins of a particular type per cell

If you know the stoichiometry of a particular ion channel and do something like patch-clamp, where you know the surface area being clamped, then you can measure the ion-flux per unit time and from ...
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  • 7,783
1 vote
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Why are the walls of the bronchioles folded?

Those foldings are called as mucosal folds, formed by the contraction of smooth muscles , are also present in trachea, and in many other organs such as gallbladder etc. Physiologically: This folding ...
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1 vote

Parietal and Visceral epithelia

Yes, the parietal pleura is on the wall of the thorax. That picture isn't great. Each lung has its own pleural cavity, ie its own visceral+parietal. Another important thing is the folding over. ...
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  • 62
1 vote

Nernst equation and equilibrium potential

The Nernst equation should be: $\frac{RT}{zF}\ln\left(\frac{\mathrm{Out}}{\mathrm{In}}\right) = 2.3 \frac{RT}{zF}\log_{10}\left(\frac{\mathrm{Out}}{\mathrm{In}}\right)$ You substituted for 2.3 RT/F (...
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1 vote

What is the basis of the endocochlear potential?

About biological electrical potentials generally Biological potentials on the order of tens of millivolts depend on very very few ions moving (about 1/100,000 of the potassium concentration, for ...
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1 vote

Plasma Membrane Proteins and Cytoskeletal Attachment

a. Membrane proteins are responsible for both cell to cell recognition and cell anchoring and are stabilised by linking through to the microtubulele cytoskeletal fibres. Not entirely correct as you ...
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1 vote

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

But when does exactly osmosis occurs instead of diffusion? These processes are not mutually exclusive. Both can happen simultaneously. Their rates depend on different parameters such as permeability ...
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1 vote
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Ways to cause membrane damage to microalgae and yeast?

To get to the membrane of these species you first need to get past a formidable cell wall. The methods listed below are therefore more aimed at making cells permeable but the membranes must sustain ...
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