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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.
describe general characters and classification of amphibia in brief
Allele-specific ligation is the technique permitting discrimination of two allele at locus by giving two short synthetic oligonucleotides which would bind ajjacent to teach other
Preference Share Capital or Quasi-Equity It is also called quasi-equity because it combines features of equity and those of debt. It is preference because it is preferred to
Why is sex-linked inheritance an example of nonmendelian inheritance? The Sex-linked inheritance is a kind of nonmendelian inheritance because it opposes Mendel's first law, wh
Determine some assessment measures of Zinc? Measurement of zinc in plasma: This is the most common method. Fasting concentrations of less than 70 μg/litre suggests deficie
Q. What is the metagenesis? What are the other names of this procedure? Metagenesis is thekind of life cycle in which there are two different forms of individuals of the same s
Osmoregulation in Freshwater Metazoans Freshwater and brackish water animals that are live in hypoosmotic(of lower osmotic pressure) environment and keep a hyperosmotic (of h
What are plant root hairs? Where can they found and what is their function? The Root hairs that are external elongated projections of the root epidermis and their role is to in
Digestion of proteins Digestion of proteins is initiated in the stomach by pepsin. Pepsin acts upon food proteins and converts them to proteoses and peptones whic
Q. Percentage ratio of ash in honey? Standards allow ash content in honey up to 0.5 per cent, but the ash of genuine honey seldom exceeds 0.35 per cent. It is determined by cha
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