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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.
MECHANIS M OF FERTILIZATION - The process of fertilization complete into 5 steps - 1 . APPROACH OF SPERM TO OVUM For fertilization sperm & ova interaction is
Explain the term of Monosaccharides? Monosaccharides : The simplest carbohydrates are Monosaccharides, simple sugars. These generally have three to six carbon atoms, and con
Mitochondria Mitochondria are commonly known as the "power house" of cells. These are the distinct organelles of all eucaryotic cells, plants, fungi and some protists. In the
Extraction of the tooth -In nonstrategic importance -Diseased maxillary second molars with no opposing tooth , or with an opposing tooth in class l or lll occlusion that ar
What is linkage? Two genes are assumed to be under linkage, or linked, when they reside in the same chromosome. For instance, the research of the human genome discovered tha
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Stentless Devices : A bioprosthesis mounted on a stent reduces the effective orifice area (EOA). The newer version (third generation) stentless gluteraldehyde preserved porcine v
Explain the interaction of vitamin A with Iron? Iron: Iron status of an individual correlates with vitamin A. The deficiency of vitamin A has been found to be associated with
Define some Precautions for spore staining in a given bacterial culture? 1. Do not allow malachite green to dry on slide. 2. Decolourization should be done only after coolin
Explain the Recommended Dietary Allowances - Nutrition? The recommended dietary allowances are defined as the 'daily dietary intake level that is sufficient to meet the nutrien
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