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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.
Q. What are the four initial stages of the embryonic development? The four early stages of the embryonic development are the blastula stage, the morula stage, the gastrula stag
What are two specific organs that work together to preform a function??
Evolution: This deals with the origin of newer types of organism from the previous ones by modification involving genetic changes and adaptations. Evolution also called as biologic
With the help of reaction briefly explain the oxidative phase of the pentose phosphate pathway. The oxidative branch of the pathway generates NADPH and pentose-5 phosphate, th
How sugar play a major role in Fermentation? The production of chemicals by fermenting several sugars is a very well-accepted science. Its utilize ranges from producing beverag
VASCULA R TISSUES (= FLUID TISSUES) - The vascular tissues are of two types: blood and lymph.
According to their functions how can nutrients are classified? One possible and utile functional classification for nutrients is the one that divides them into energetic, struc
Define the Bacillus cereus Bacillus cereus is not a common cause of food poisoning. It is a Gram positive, aerobic, spore forming rod shaped bacteria normally present in soil,
Explain lipids? Lipids : Lipids function as energy-storing molecules such as fats and oils, protective waxes, digestive tract lubricants, heat insulation such as whale blubber
Acrylamide gel is a polymer gel used for electrophoresis of DNA or protein to measure their sizes (in the daltons for proteins, or in base pairs for DNA). See "Gel electrophoresis
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