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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.
Process of Regeneration in Planarians Regeneration in planarians has been broadly studied and considerable information regarding this phenomenon is now available. Let us see w
#questwhy and where endomitosis happens?ion..
Explain Mechanism for reduce the absorption of nutrients? The absorption of nutrients is also reduced by mechanisms other than increasing the viscosity of gastrointestinal cont
What are colonies and societies? Colonies are functional integrated aggregates produced by individuals of the same species. Colonies are often confused with a one individual. E
what are the excretory organ of protozoa ?
Population You must be familiar with the term 'population'. It is one of the most talked about issues of this century. It is feared that the rapid growth of the world population
What is Classic Blalock-Taussig BT Shunt in Shunt Operations ? Subclavian artery, which arises from innominate artery, is anastomosed to pulmonary artery. In a patient with lef
Food Applications of Agar The bakery industry has been the largest user of agar because of its heat- resistant gel properties. Confectionary products, such as agar jelly candi
Define Function of the Iron Uptake by Cells? Iron has several vital functions in the body. It serves as a carrier of oxygen to the tissues from the lungs by red blood cell haem
discuss the importance of protozoa to humans
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