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

Barrier function of epithelium and endothelium in corneal, Explain about th...

Explain about the barrier function of epithelium and endothelium in corneal hydration. Barrier Function of Epithelium and Endothelium: Epithelium offers twice the resista

Explain apomictic embryos in citrus, Apomictic embryos in citrus arise from...

Apomictic embryos in citrus arise from: 1. Synergids 2. Maternal sporophytic tissue in ovule 3. Antipodal cells 4. Diploid egg Maternal sporophytic tissue in ovule

Energy absorbed by plants, Normal 0 false false false E...

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

What are the major representatives of the pteridophytes, Q. What are the ma...

Q. What are the major representatives of the pteridophytes? Is this plant group phanerogamic or cryptogamic? The better known pteridophytes are the ferns and the maidenhairs, f

Provide the definition of health care, Provide the Definition of Health Car...

Provide the Definition of Health Care? Health care involves much more than just medical care and can be defined as "multitude of services provided to individuals or communities

Explain the community ecology of disease, Explain the Community ecology of ...

Explain the Community ecology of disease? Ebola, hantavirus, bubonic plague, Lyme disease, West Nile virus, rinderpest, and canine distemper virus are all instances of diseases

What do you mean by endemic goiter, Q. What is a goiter? What is endemic go...

Q. What is a goiter? What is endemic goiter? How this problem is socially solved? Goiter is the abnormal enlargement of the thyroid gland the goiter appears as a tumor in the a

Why can the genetic code be qualified as a degenerate code, Why can the gen...

Why can the genetic code be qualified as a "degenerate code"? The genetic code is a degenerate code because there are amino acids codified by more than one type of codon. It is

What is the objectives of evaluation of patient clinical, What is the OBJEC...

What is the OBJECTIVES of evaluation of patient clinical examination ? After going through this unit, you should be able to: 1. Carried out the general physics-examination; 2.

Chemical and heat burn, Chemical and Heat Burn Chemical born and Heat ...

Chemical and Heat Burn Chemical born and Heat burn injuries have currently started receiving greater attention. The reason for this is perhaps the degree of discomfort and per

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