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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.
Eyes We have a pair of eyes. They are held in socket of the skull by four rectus muscles and two oblique muscles. These muscles control the movements of the eyes. The wall of t
Tracheae - Respiratory Organs Tracheal respiration is characteristic of insects. Onychophorans, diplopods, arachnids, and chilopods as well use tracheal system for respiration
What is plutonium reprocessing? Why is it a big environmental issue? Plutonium is the highly radioactive chemical element produced from uranium by nuclear plants. Plutonium can
Nastic and Epinastic Responses Paratonic variation movements of plant parts in which direction of movement is independent of the direction of stimulus. Nastic responses are l
what is agar shake method
The bar-tailed godwit, Limosa lapponica baueri, or kuaka, is a wading shorebird seen on marshy estuaries and wetlands during the New Zealand summer. Populations of this species emb
State two ways in which sulphur dioxide emissions from coal-fired generating stations could be reduced. Sulphur dioxide emissions can be reduced by fitting desulphurization pl
Define about the Food Production? We know that agriculture comprises the major source of food production. This is very true in a country like ours where the majority of the pop
locomotary organ in mollusca
regenerstion in invertebrates
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