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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 two groups of defense mechanisms of the body against harmful agents or foreign? What is the difference between them? The body has many defense mechanisms agains
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How can germs can be transmitted Germs can be transmitted many ways, including: Touching dirty hands; Changing dirty or contaminated cloths; Through contaminated water and f
State the term Autopsy data - Brain patient Autopsy data are not always entirely usable for validation purposes, in that numerous changes may have taken place in the patient's
How did the first fermenting autotrophs appeared? What about the first aerobic beings? A heterotrophic hypothesis asserts that the first living beings were the fermenting heter
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Nekton - Aquatic Ecosystem This group contains animals which are swimmers. The nektons are relatively large and powerful as they have to overcome the water currents. The anima
Amylase The presence of pancreatic amylase brings about the breakdown of starch and glycogen and its action is similar to salivary amylase. The hydrolysis of starch and gl
NON-EDIBLE AND OTHER MINOR OILSEED CAKES Besides the annually cultivated oilseed crops namely, groundnut, sesame, mustard, linseed, coconut, cotton, sunflower and safflower, I
Define the term price mechanism and how it works. The price mechanism and its working: The above demonstrated diagram assumes the market is into equilibrium, whereby deman
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