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 global warming, What is global warming? Global warming is the e...

What is global warming? Global warming is the enhance in the temperature of the planet due to accumulation of some gases in the atmosphere, especially gases that retain the sol

What are the common changes in the eye, What are the common changes in the ...

What are the common changes in the eye Other changes in the eye are: 1) Increase in curvature of anterior surface of lens. 2) Anterior pole of lens moves forwards without

What are enzymes?, Enzymes are proteins that are catalysts of chemical reac...

Enzymes are proteins that are catalysts of chemical reactions. From Chemistry, it is called that catalysts are non-consumable substances that decrease the activation energy essenti

Homeostasis, negative and positive feedback

negative and positive feedback

Arthropod classes characterized to the body division, Q. How are the three ...

Q. How are the three major arthropod classes characterized according to the body division? In arachnids and crustaceans the head is fused with the thorax forming the cephalotho

Plant physiology, what is the importance of lignin in xylem formation

what is the importance of lignin in xylem formation

Explain performance testing of fats and oil, Explain performance testing of...

Explain performance testing of fats and oil In these cases, performance testing is the only means for evaluating the ability of fat or oil to perform the desired functions in a

Explain flucytosine, Explain Flucytosine Flucytosine (Ancobon) - Potent...

Explain Flucytosine Flucytosine (Ancobon) - Potentially lethal, dose-related bone mar- row toxicity, colitis and rapid development of resistance when used alone limit the use o

Anatomy and physiology , describe how ulcers can lead to distention and ir...

describe how ulcers can lead to distention and irritation followed by vomiting?

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