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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.
Floral Induction The transformation of vegetative apex into a floral apex is a multifactor and multistep phenomenon. Despite researches on flowering carried out during the las
Determine the Fluids and Electrolyte Requirement at high Altitude? In addition to cold induced diuresis, hyperventilation together with a dry environment at HA makes an individ
Q. What are blood stem cells? Stem cells are undifferentiated cells able to differentiate into other kinds of specialized cells. The stem cells of the bone marrow originate
Explain about Folic acid Folic acid occurs as a yellow or orange-yellow, microcrystalline powder, almost without odour and taste. Water content of folic acid is up to 8.5%. Fol
Q. Investigation of aortic regurgitation by Surgical Therapy? The recommendation for Aortic valve replacement is only for those patients with Severe AR. If patients with mild A
Which is the cell organelle that is specialized in aerobic respiration? The cell organelles that are specialized in aerobic respiration are the mitochondria. Cell Respiratio
Applications of microbiology in different fields
In chemistry and particularly in biochemistry the fatty acid is a carboxylic acid with a long aliphatic tail (chain) that is either saturated / unsaturated. Many obviously occurrin
How sugar play a major role in preservation? In so many products, sugars play a major role in preservation. The addition of monosaccharides, like glucose or fructose, to jams a
Pressure Gradient You know that air pressure is the weight of the atmosphere over a unit area of the earth's surface. The average air pressure at sea level is approximately 1 k
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