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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.
what are the general methods for studying microbial physiology
Electro magnetic radiation Light is one form of energy. The light rays consist of tiny particles called photons. The energy carried by photon is called quantum. Light
What is plant cell walls made of? Explain the function of cell walls? Plant cell walls are made of cellulose embedded in carbohydrates and proteins. Cell walls help su
Maintenance Therapy A complete remission implies a clinical, haematological and bone marrow remission. For remission therapy drugs like, methotrexate cyclophospharnide and 6-
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Q. What are respiratory pigments? What is the respiratory pigment present in some arthropods? Which is the analogous molecule in humans? Respiratory pigments are molecules able
Describe how the International Astronomical Union defines a planet. Also include why Pluto is no longer considered a planet.
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