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

How is the cerebrum anatomically divided, How is the cerebrum anatomically ...

How is the cerebrum anatomically divided? The cerebrum is divided into two cerebral hemispheres, the right and the left. Each hemisphere is made of four cerebral lobes: frontal

Define disadvantages of using yeast as a source of protein, Define Disadvan...

Define Disadvantages of using yeast as a source of protein? 1. Less protein yield (45-60%) 2. Growth rate is low (1-3 h) 3. High nucleic acid content leading to the forma

Aminoacyl-trna binding, In this 1st step, the corresponding  aminoacyl-tRN...

In this 1st step, the corresponding  aminoacyl-tRNA for  the  second  codon  binds  to  the  A  site  by  codon-anticodon interaction.  Binding  of  the  aminoacyl-tRNA needs  elon

What is the role of Naupliar eye, What is the role of Naupliar eye? The...

What is the role of Naupliar eye? The unique eye found in larval stage of the crustacean life cycle. This single compound eye is located medially, and with exception of copepod

Explain the process of nuclear reorganization, Process of nuclear reorganiz...

Process of nuclear reorganization in protozoa in which nucleus divides, each half undergoes a maturation, and two persisting functional nuclei reunite is termed as: a) Autogamy

Describe the metabolism of lipids, Q. Describe the metabolism of lipids? ...

Q. Describe the metabolism of lipids? Fats are split into fatty acids and glycerol by the enzyme. They are absorbed in small intestine and recombined into fats. It is stored in

Cyanide - enzyme-activity control, Cyanide - Enzyme-activity Control P...

Cyanide - Enzyme-activity Control Plants generate cyanide from cyanogenic glucides and histidines. Ethylene biosynthesis is also accompanied by cyanide production. Nitrate red

Determine the nature and degree of abnormality, Determine the Nature and De...

Determine the Nature and Degree of Abnormality The nature and degree of abnormality will effect normal neural growth and maturational outcome. For example, in an adult damage t

Characteristic features of avian gastrulation, Characteristic Features of A...

Characteristic Features of Avian Gastrulation Creation of hypoblast and its important role in formation of the axis and orientation of embryo. Existence of the cells

Animal around us, #question.what are the reason that arthropodans are abund...

#question.what are the reason that arthropodans are abundant in nature.

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