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

What is the disease caused by vitamin d deficiency, What is the disease cau...

What is the disease caused by vitamin D deficiency? Which tissue does it affect? The lack of vitamin D causes the disease called as rickets (rachitis), characterized by decalci

How to monitor body weight to enhance athletic performance, How to monitor ...

How to monitor body weight to enhance athletic performance? Monitoring body weight is a practical way to assess energy balance. Weight stability, particularly during periods

What is microbodies , What is Microbodies ? Microbodies : Microbodi...

What is Microbodies ? Microbodies : Microbodies are formed by pinching off of vesicles from rough endoplasmic reticulum. They are not found in every cell, but are present a

Mechanical isolation, In certain instances differences in the morphology of...

In certain instances differences in the morphology of genitalia between species make it impossible for normal mating to occur, and sympatric species tend to remain isolated. When t

State the red blood cells in the body capillaries in a leg, Which of the fo...

Which of the following will lead to a decrease in the amount of oxygen delivered to the body cells in a leg? A. A decrease in hydrogen ion concentration in red blood cells in t

Lymph, Why lymph is also called middle man of body

Why lymph is also called middle man of body

Equine herpes virus infections , Equine herpes virus infections (equine rhi...

Equine herpes virus infections (equine rhinopneumonitis, abortions) Equine herpes virus infections in horses and foal are caused by Alphaherpes virus of herpesviridae family p

Elimination of the risk factors - diabetes mellitus, Q. Elimination of the ...

Q. Elimination of the risk factors - diabetes mellitus? In other words, in diabetes it refers to maintaining of normal body weight, healthy nutritional practice, regular physic

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