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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.
what are the gonad gland disorders and what do they do
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Determination of vitamin c Majority of chemical methods of determination is based on the rapid oxidation of ascorbic acid and therefore not too highly specific. Titration of
assignment on biodiversity management
DIFFERENCE S BETWEEN MEDULLATED AND NON-MEDULLATED NERVE FIBRES 1. Medullated (Myelinated) Nerve Fibres Medullary sheath is present.
Which term is used to describe the process whereby a catheter is inserted into an individual's heart, a radio-opaque medium is injected & x-ray images are made. Procedure is use
Define Iron Response Element and Iron Regulatory Protein? The Iron Response Element (IRE) and the Iron Regulatory Protein (IRP) play key roles in co-ordinating regulation of ir
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 about Suspensions Sol is a colloidal system, in which solid particles are dispersed in a liquid. When the particles of a solid are separated into large aggregates of pa
1. A roan bull which is heterozygous for the polled condition is mated to several cows of identical genotype to his. How many roan, polled animals should be produced out of 16?
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