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

How can we determine the status of brain function, How can we determine the...

How can we determine the status of brain function Neuropsychological assessment is the clinical practise of using tests and other behavioural evaluation instruments to determin

Role of psychiatric nurse, ROLE OF PSYCHIATRIC NURSE: In Blocks 2 and ...

ROLE OF PSYCHIATRIC NURSE: In Blocks 2 and 3 you have learnt about various therapeutic interventions  for mental disorders  like anxiety neurotic disorders, psychotic disorder

Reproduction, write about asexual reproduction in mucor

write about asexual reproduction in mucor

What is the kind of nitrogen waste that mammals eliminate, Q What is the ki...

Q What is the kind of nitrogen waste that mammals eliminate? Like chondrichtian fishes and adult amphibians, mammals are ureotelic that is they excrete urea. Q. How do plac

Categories of value of biodiversity, Q. Categories of value of biodiversity...

Q. Categories of value of biodiversity? The value of biodiversity is often divided into two main categories: · UTILITARIAN (also known as instrumental, extrinsic, or use) v

Neurological and neurovascular observations, what is the difference between...

what is the difference between neurological and neurovascular observations

Define phenolic acids and derivatives, Define Phenolic Acids and Derivative...

Define Phenolic Acids and Derivatives? Two families of phenolic acids are widely distributed in plants: a range of benzoic acid derivatives and those derived from cinnamic acid

Define fermented dairy products-butter, Normal 0 false false ...

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

Estrogens, Normal 0 false false false EN-IN X-NONE ...

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

Evolution, Evolution can be explained as follows  1) The change in the ...

Evolution can be explained as follows  1) The change in the life over time by adaptation, over-reproduction, variation and differential survival/reproduction, a procedure refer

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