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

Explain about the folate, Explain about the Folate? Folate is a generic...

Explain about the Folate? Folate is a generic term which includes naturally occurring food folate and folic acid in supplements and fortified foods. Pteroyl monoglutamic acid a

Structural differences between roots and shoots, What are the structural di...

What are the structural differences between roots and shoots? What structures are unique to each?

Which organs form the human respiratory system, Q. What are the organs that...

Q. What are the organs that form the human respiratory system? The organs that are part of the human respiratory system can be divided into three groups: lungs, respiratory mus

Common disease of cattle & buffaloes, COMMON DISEASE OF CATTLE & BUFFALOES ...

COMMON DISEASE OF CATTLE & BUFFALOES - 1 .      Anthrax - Its symptoms are high temp, painless & warmthless swellings on different body parts. Bloody discharge from na

Glands associated with eyes, GLANDS - 1 .       LACRYMAL GLANDS - ...

GLANDS - 1 .       LACRYMAL GLANDS - Tear glands numbers are 3. Its secretion is aquous & salty, keeps eye ball wet, give nourishment to cornea. Lysozyme also present

# FUNGAL NUTRITION, Write on spoilage of food products by fungi,nutrition,c...

Write on spoilage of food products by fungi,nutrition,condition for growth,consequencies and prevention.

Explain gluconeogenesis, Explain Gluconeogenesis Gluconeogenesis (i.e...

Explain Gluconeogenesis Gluconeogenesis (i.e synthesis of  new  glucose)  is  the  synthesis of carbohydrate from  non-carbohydrate, source. The major  substrates for glucone

Define surface sampling, Define Surface Sampling Food contact surfaces ...

Define Surface Sampling Food contact surfaces (e.g. storage tank, packaging material, ripening room, utensils, equipments, refrigerators etc.) which directly or indirectly (wal

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