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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.
transport systerms
What are the major plant tissues that form the rings observed on stem sections of some trees? The rings observed on a stem cross section of the dicot trees are made of conducti
i have a question on how to proceed the fomular of delete the gene on the human body.
Q. Show the Factors affecting osseointegration? The success or failure of osseointegration is dependent on the following factors. a) Occlusal load b) Biocompatibility of
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55yrs old woman had burns and has lost 6% body fluid.She weighs 50Kg.How much fluid does she need to replace the lost fluid.
Q. What do you mean by biodigester? A biodigester is equipment that produces hydrogen sulfide, carbon dioxide and fuel gases (biogases) like methane from organic material under
Body systems and organs and their functions The human body is a large structural unit made up of many smaller parts. There are four kinds of smaller units - cells, tissues, org
Q. Dietary considerations oesophagitis? The dietary considerations for this condition are the same as in oesophag it is. The patient should be recommended to: • eat smaller
What is Electron Cloud Model ? Electron Cloud Model : In recent models of the atom, electrons form electron clouds, in which electrons travel in spherical and dumbbell-shap
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