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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.
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According to the current concept of speciation, a widely distributed species should break up into partially isolated rule species. The different subspecies become differentiated fu
Explain about Stacking faults Stacking faults happen in a number of crystal structures, but the common example is in close-packed structures. Face-centered cubic (fcc) struct
HEREDITY 1. Like begets like i.e; every living organism reproduces its own kind. Frog reproduce frogs, rats reproduce rats only. 2. Heredity includes the cha
Q. Which are the cell organelles that participate in cell division and in the formation of cillia and flagella of some eukaryotic cells? The organelles that participate in the
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Fertilizers and Fertilizer Management Fertilizers, in a broad sense, include all materials that are added to soils to supply certain elements essential to the growth of plants
Q. Explain about Ecological species concept? The ecological species concept: This identifies a species as a population that occupies a distinct ecological niche, whence its rep
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