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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.
Urine Normal urine is clear, yellow in colour, slightly acidic. Urine consists of 96% water and 4% solids like urea, uric acid, urates, chlorides, phosphates, oxalates, sulphat
Explain the Development of SIRS or MODS? Multiple hypothesis have been proposed to explain the development of SIRS or MODS. The progression of SIRS to MODS appears to be mediat
Define Nitrogen requirements in Pregnancy and Lactation? The nitrogen accretion in the pregnant woman (assuming that the foetus weighs 3.3 kg at term), estimated by the Committ
Q. What do you know Zoological Parks? Zoological park has two faced aspects, the relationship between man and beast. There is awe and there is slaughter. There is worship and t
Define the characteristics that are seen in Rickets? The following characteristics are seen in fully developed cases of rickets: 1) In case of young infants, delayed closure
Define the Miscellaneous Applications of Sugar? Sugars are used in 1. Custards, 2. puddings, 3. pie fillings and meringues Depending on the sugar to perform vital c
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discuss the stereo isomerism of monosaccharides
Asymmetrical and Spherical - Metazoa Some creatures are asymmetrical: no matter which way we try to divide them through the middle, no two halves would appear alike. In simple
Surface Run-off - Causes of Water Pollution The surface run-off from cultivated lands where inorganic fertilisers, pesticides, insecticides and rich manure are applied and sol
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