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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 homologous chromosomes? Which are the human cells that do not have homologous chromosomes? Chromosomes have genes (genetic information in the form of nucleotide sequen
Class of Subphylum Uniramia - Chilopoda Chilopoda have the centipedes. The class contains some 2500 species that have been described so far. They inhabit both of the tropical
Define Drug metabolism (Poly-pharmacy)? As older persons are sometimes prescribed number of medications, care is to be taken, as there is reduction in renal and hepatic clearan
classification of excretory organs in helminthes, nermatodes, annelids, molluscs, arthropods and echinodems
Nature of Light - Floral Induction Red light promotes flowering in short day plants. If the dark regime of a short day plant is interrupted by red light, flowering is inhibite
describe polymorphism in lysosomes in short
TESTE S (TESTICLES) - 2 in number (Diarchic). Pinkish in colour. Oval shaped. 4-5 cms long, 2.5 cm wide and 3 cm thick. Mesodermal. In embryonic stage attached to kid
List three human activities which could cause the loss of a species. Human activities which threaten species with extinction are: (i) hunting of individual species, (ii) over-
Explain the Flow Phase of Stress Response? This is a neuro-endocrine response to physiological stress following the ebb phase. This phase is characterized by: Normal or
State the the amount of the nutrient On increasing the amount of the nutrient the yield increases and the decrease from the maximum i.e., (A-y) becomes less. Subsequent additio
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