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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.
Explain the Toxicity of Vitamin E? Vitamin E is relatively non-toxic. Adults tolerate doses as high as 100 to 1,000 IU per day. However, adverse effects such as muscle weaknes
Stentless Devices : A bioprosthesis mounted on a stent reduces the effective orifice area (EOA). The newer version (third generation) stentless gluteraldehyde preserved porcine v
What is life?
Q. Are gametes always made by meiosis? In the haplontic haplobiontic life cycle and in the plant life cycle (diplobiontic life cycle) gametes are made by mitosis and not by mei
Define Importance of Intestinal Bacterial Synthesis as a Source of Vitamin K? Intestinal microflora synthesizes large amounts of menaquinones, which are potentially available a
feeding mechanism of man
Define Some Example of Acidic and Basic Buffer? Frequently used example of acidic and basic buffer includes: - Acidic buffer: a mixture of CH 3 COOH (acetic acid) + CH 3 C
State the Variety of chemical and biological reactions Variety of chemical and biological reactions takes place leading to the formation of the solution phase. If we analyse th
What is absorption? Absorption involves the transfer of materials through the mucosa of the alimentary tract into blood and lymph vessels.
Environment All organisms are intimately dependent on the environment from which they derive their sustenance. Organisms from virus to man are obligatorily dependent on the envi
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