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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.
Triacylglycerols are synthesized from fatty acyl CoAs and glycerol 3-phosphate.The glycolytic intermediate dihydroxyacetone phosphate is first reduces to glycerol 3-p
Gastrulation Gastrulation is the process through which the presumptive areas of organ specific rudimetns present on the surface of blastula move to their specific position
Producers - Biotic Components Producers also called autotrophs are largely green plants that can make food from simple inorganic materials. Food refers to complex organic comp
Explain Counter Stain - Ziehl-Neelsen Method? Methylene blue is used to stain previously decolourized cells. All non acid-fast bacteria de-stained by acid alcohol now absorbs c
Aerotolerant anaerobes are incapable of aerobic respiration, but can nevertheless grow in the presence of air. Many lactic acid bacteria fall into this category. They can only gene
Define Malnutrition - Effects on Milk and Effects on Mothers? Milk is the sole source of nourishment for many infants for upto 6 months or a year or even more. Therefore, the r
Evolution of Horse - Credit to Prof. C. Marsh (1879) of Yale University for complete work. S.No Fo ssil/Genus Period
What are genetic mutations? The Genetic mutations are alterations of the genetic material (compared to the normal condition of the species) involving modifications in the norma
Fracture - It is a break of a bone. Bone fracture are of many types - (i) Green stick fracture - It is merely a crack, the bone remains partly intact. (ii ) Sim
Epidemiological Theory - Accident Causation Epidemiological theory of accident causation considers industrial hygiene that concerns environmental issues and may result in sick
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