Explain membrane permeability, Biology

Assignment Help:

A pure  phospholipid  bilayer with  its  hydrophobic  interior,  is permeable  to water and gases such as O2, CO2, N2 and small uncharged  polar molecules such as urea, ethanol, but is impermeable  to large uncharged polar molecules such as glucose, ions (Na+   , K+   , Cl-, Ca2+   ) and charged polar molecules instance for amino acids, ATP, glucose  6-phosphate. The initial group of molecules  can cross a biological membrane  unaided  and without  an input  of energy,  whereas  the latter group requires  the  presence  of  integral  membrane  transport  proteins  and,  in  many cases   an   input   of   energy   to   travel   by   the   otherwise   impermeable membrane  barrier.  Thus the plasma membrane and the membranes of internal organelles are selectively permeable barriers and maintaining a distinct internal environment.

 


Related Discussions:- Explain membrane permeability

Phosphodiesterase inhibitors, Phosphodiesterase Inhibitors and Other Agents...

Phosphodiesterase Inhibitors and Other Agents Amrinone and Milrinone are prototypes of type III PDE inhibitors. They decrease the breakdown of cyclic AMP in the myocardium and i

What do you understand by carcinogen, What do you understand by Carcinogen?...

What do you understand by Carcinogen? Carcinogen is an agent or a process, which significantly triggers the cell to grow in an uncontrolled manner producing malignant neoplasm

How vitamin e provide synthesis of enzymes and proteins, How Vitamin E prov...

How Vitamin E provide Synthesis of enzymes and proteins? 1) Synthesis of enzymes and proteins: It serves as a co-repressor in the synthesis of certain enzymes and plays a speci

Scrapie, Scrapie This is a chronic fatal disease of sheep and occasiona...

Scrapie This is a chronic fatal disease of sheep and occasionally of goats caused by a Prion agent similar to BSE. The disease is reported from Europe, North America and in a f

What is atrial fibrillation, Q. What is Atrial Fibrillation ? As the le...

Q. What is Atrial Fibrillation ? As the left atrial size increase and atrial wall gets fibrosed, depolarization wave fronts get fragmented and atrial fibrillation sets in. Atri

Temperature relations in animals, Normal 0 false false fals...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Explain about stacking faults, Explain about Stacking faults Stacking ...

Explain about Stacking faults Stacking faults happen in a number of crystal structures, but the common example is in close-packed structures.  Face-centered cubic (fcc) struct

Define sample titration for estimation of reducing sugar, Define Sample Tit...

Define Sample Titration for Fehling Soxhlet Method Dilute the given sample glucose solution in 100 ml volumetric flask to the mark with distilled water. Pipette 5 ml of Fehling

What is a closed circulatory system, Q. Define a closed circulatory system?...

Q. Define a closed circulatory system? A closed circulatory system is one in which blood circulates only inside blood vessels for this reason the blood pressure is higher in so

Explain chorioallantois membrane of birds and reptiles, Q. What is the chor...

Q. What is the chorioallantois membrane present in the embryonic development of birds and reptiles? How does this membrane participate in the energetic metabolism of the embryo?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd