6 votes
Accepted

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 ...
Hayden S's user avatar
  • 176
6 votes
Accepted

Where in the cochlea are frequencies below 200 Hz detected?

The answer is two fold, each related to the two ways pitch is encoded in the inner ear. These two mechanisms are place coding and rate coding. Regarding place-pitch; given that there are hair cells ...
AliceD's user avatar
  • 52.4k
3 votes

Why is iron transported across membranes in the ferrous form?

This is not my subject, but from scanning the introductions to a couple of reviews on the general topic of iron metabolism, the following factors seem to be important: Ferric iron is less soluble ...
David's user avatar
  • 25.2k
3 votes

Where in the cochlea are frequencies below 200 Hz detected?

A figure like this is likely representing the best frequency for hair cells. In actuality, cells respond to a broad range of frequencies. Perceptual specificity comes thanks to lateral inhibition. ...
Bryan Krause's user avatar
  • 45.3k
3 votes
Accepted

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 ...
Bryan Krause's user avatar
  • 45.3k
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 — ...
James's user avatar
  • 11.3k
2 votes
Accepted

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 ...
player87's user avatar
  • 246
2 votes
Accepted

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 ...
Alan Boyd's user avatar
  • 22.8k
2 votes

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. ...
Ricky's user avatar
  • 87
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. ...
Bryan Krause's user avatar
  • 45.3k
1 vote
Accepted

Why don't membrane potentials violate the principle of electroneutrality?

There is perhaps Pauling's principle of electroneutrality "each atom in a stable substance has a charge close to zero" - maybe that's the principle referred to in your book? "Close to&...
Bryan Krause's user avatar
  • 45.3k
1 vote

Does this explanation hold good even in case of Mitotracker red?

No, the Mitotracker probes accumulate in active mitochondria, not in ones that are dysfunctional, as mentioned in the product page from Cell Signalling Technologies (emphasis mine): ...with ...
bob1's user avatar
  • 11.7k
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 ...
bob1's user avatar
  • 11.7k
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 (...
Bryan Krause's user avatar
  • 45.3k
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 ...
Bryan Krause's user avatar
  • 45.3k
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 ...
WYSIWYG's user avatar
  • 35.5k
1 vote
Accepted

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 ...
JM97's user avatar
  • 4,796

Only top scored, non community-wiki answers of a minimum length are eligible