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

Eyes, Are dogs colour blind

Are dogs colour blind

Direct approach to counseling, Q. Direct Approach to counseling? The di...

Q. Direct Approach to counseling? The direct approach to counselling is also called as the problem-solving approach. The counsellor collects relevant information which aims to

Describe valsalva manocuvre in dynamic auscultation, Describe Valsalva Mano...

Describe Valsalva Manocuvre in dynamic auscultation ? This consists of deep inspiration followed by forced inhalation against a closed glottis for 10-20 seconds. It can be perf

Deficiency diseases-downer cow syndrome, Downer cow syndrome This syndr...

Downer cow syndrome This syndrome is a common sequel to milk fever. The term is commonly applied to those hypocalcaemic cows that remain recumbent for several hours before bein

How the couple is a carrier for a genetic disease, On a separate piece of p...

On a separate piece of paper, draw a simple family tree for a couple showing children (F1), and lineages from two children showing grand children (G2), great grandchildren (G3), gr

What is lysosomes, What is Lysosomes? Lysosomes :  Animal and fungal ...

What is Lysosomes? Lysosomes :  Animal and fungal cells contain membrane-bound organelles called lysosomes, which are filled with digestive enzymes. These digestive enzyme

Some common air pollutants: carbon monoxide, 1.   Carbon monoxide (CO): ...

1.   Carbon monoxide (CO): It is colourless, odourless, tasteless gas and is not soluble in water. Source: CO is produced due to: (i)     Incomplete combustion of fuels

Explain the applications of vitamin B12, Explain the Applications of vitami...

Explain the Applications of vitamin B 12 Cyanocobalamin is used in the preparation of liquid and dry drug formulations of all kinds. In the animal feed industry, usually co

Rk, how many chromosomes in human

how many chromosomes in human

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