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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.
Autonomic Nervous System (ANS) Autonomic Nervous System functions without conscious control of central nervous system. This system controls the functions of cardio-vascular, ga
Explain the Protein Efficiency Ratio (PER)? PER method was developed by Osborne, Mendel and Ferry in 1919 and is based on the growth of young rats. The diets usually contain 10
differentiate between scanning electron microscope and a transmission electron microscope in terms of their functions
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Describe the Biological parameters of living organisms Biological parameters which include living organisms constitute an important component of soil. Even though organisms fo
how does these phylem parasites????
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Explain the Management of Eating Disorders? We shall consider the components of the management of anorexia nervosa and bulimia nervosa together, since the nutritional consequen
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