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

Non-muscular movement, NON-MUSCULA R MOVEMENT - 1 .      Streaming m...

NON-MUSCULA R MOVEMENT - 1 .      Streaming movement - In amoeba, cyclosis is common. 2 .      Pseudopodial - In leucocyte, macrophages, amoeboid movement take place

What is the neurotransmitter of the neuromuscular junction, What is the neu...

What is the neurotransmitter of the neuromuscular junction? How does the nervous system trigger muscle contraction? The nervous cells that trigger the muscle contraction are th

What are nymph and imago, What are nymph and imago? Nymphs are larvae o...

What are nymph and imago? Nymphs are larvae of hemimetabolic insects (like grasshoppers). They are very same to the adult insect although smaller. In holometabolic insects (lik

Neurofilaments and microtubules - nervous system, Normal 0 fals...

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

Show some evolutionary advantages of animals, Q. What are some evolutionary...

Q. What are some evolutionary advantages of animals with complete digestive tube? The complete digestive tube permits animals to continuously feed themselves without waiting fo

Describe the general guidelines for use of bone grafting, General guideline...

General guidelines for use of BONE GRAFTING 1. The surgical site should be prepared, that is it should be free of granulation tissue. 2. For autogenous grafts- the donor sit

Ecology, Types of survivorship curves

Types of survivorship curves

Polysaccharides and oligosaccharides, Polysaccharides and Oligosaccharides ...

Polysaccharides and Oligosaccharides are both parts of carbohydrate molecules, but they vary in complexity and size. The Oligosaccharides are much easier and smaller, according to

Obturator - ovule, Obturator - Ovule An obturator is an outgrowth of t...

Obturator - Ovule An obturator is an outgrowth of the placenta or funicle or integument or style near the micropyle. It is presumed to guide the pollen tube to the micropyle.

Explain clinical analysis, Explain Clinical analysis Clinical analysis...

Explain Clinical analysis Clinical analysis:  This analysis includes a complete physical examination and a medical history. The physical examination begins with the patient's

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