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 are the characteristics of thin gingiva, Characteristics of Thin Gingi...

Characteristics of Thin Gingiva  Highly scalloped soft tissue and bony architecture  Delicate friable soft tissue  Minimal amount of attached gingiva  Thin underlying

Classify biomaterials and list some examples, Q. Classify biomaterials and ...

Q. Classify biomaterials and list some examples? Biologic classification is based on tissue response and systemic toxicity effects of the implant and is divided into three clas

Describe in brief about the boron - micronutrients, Describe in brief abou...

Describe in brief about the Boron  - Micronutrients  Boron is required in extremely small amounts in the range of 0.01 to 1.0 ppm. The actual amount may vary from crop to crop

What would we conclude from pcr/dgge, What would you conclude from PCR/DGGE...

What would you conclude from PCR/DGGE (denaturing gradient gel electrophoresis) analysis of a sample that yielded one band by PCR and one band with DGGE? One band by PCR and two ba

Aeromonas associated zoonotic disease, Aeromonas associated zoonotic diseas...

Aeromonas associated zoonotic disease Aeromonas causes gastrointestinal infections and extra intestinal infections such as cellulitis, wound infectiopn, peritonitis, endocardi

Which type of genetic disease can be identified, Which type of genetic dise...

Which type of genetic disease can be identified from the visual analysis of the number of chromosomes present in a karyotype? The counting and identification of chromosomes in

Can you illustrate trna anticodon, Q. If a tRNA anticodon is CAA what is it...

Q. If a tRNA anticodon is CAA what is its corresponding mRNA codon? For the genetic code which amino acid does this codon codify? According to the C-G, A-U rule, the correspond

Do moulds need water for growth, Do moulds need water for growth? Place...

Do moulds need water for growth? Place a spoonful of dry cereal like as rice or oatmeal in a sterile culture dish. Place a like amount of the similar cereal cooked in another c

What is meant by unsaturation or saturation of oils and fats, Q. What is me...

Q. What is meant by unsaturation or saturation of oils and fats? When it is said that a triglyceride is saturated it means that in its molecule the carbon chain is bound in its

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