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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. Why is rubella during gestation a threat to the fetus? If taking place during gestation rubella is a dangerous disease because the virus crosses the contaminates fetus and t
Describe in detail about the chlorophyll molecule Each chlorophyll molecule contains magnesium ion, there could be no green plants without magnesium. As magnesium is present in
NUCLEUS First described and christened by Robert brown 1831, a nucleus is the largest and most important organelle of eukaryotic cells. It is membrane bound and generally locat
Explain Strengthening the public health measures? Parasitic infestations and protozoal infections cause iron deficiency through loss of blood or destruction of red blood cells.
Define Metabolic Aberrations and Clinical Manifestations? The state of obesity brings about certain alterations in the normal body processes which are enumerated herewith and h
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Permeability Permeability is the ability of a soil to transmit water or air. Permeability or infiltration rate is measured in terms of the rate of water flow through the soil i
What conclusion you can draw about microorganisms that you saw under microscope from the plaque of your teeth?
Assume that you have 1 ml of a solution of amylase (an enzyme) at a concentration of 15 mg protein/ml. Calculate the volume of diluting buffer that you would have to add to 1.0 ml
Merits of Micro Propagation The special merits of micro propagation are: 1. It considerably increases the rate of multiplication 2. High rate of multiplication can be ma
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