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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.
TYPE S OF RIBOSOMES Ribosomes are of two types: - 1 . Procaryotic Ribosomes - 70 s = Occur in cytoplasm of prokaryotes, and also in mitochondria, and Chloroplast o
There is a population of 100 frogs. 20 are heterozygotes, 30 are homozygous recessive, 25 are homozygous dominate. What is the frequency of the dominate allele? The recessive allel
Q. What do you mean by Chromosome Number? We are generally aware that the number of chromosomes in each cell of all individuals of a single species is constant. ,It is also est
How emulsion are formed The most common method of preparing an emulsion is by mechanically dispersing one liquid phase in another by formation of small droplets. This takes pla
How to prevent or overcome this nutritional deficiency? A large number of government schemes and programmes have been launched about which we have already studied in the Publi
Give one example in each case of (a) a fixed joint, (b) a ball and socket joint, (c) a hinge joint. (a) The bones of the skull, the junction of pelvic gi
What is the substance that stimulates the production of red blood cells? Which is the organ that secretes it? Under what conditions does this secretion increase? The substance
What is reflexive memory? Reflexive memory relies on the cerebellum and amygdala. Compare among aerobic respiration and anaerobic respiration. Aerobic respiration happens in th
Question 1 Explain various methods employed for the lab diagnosis of rabies Definition of rabies Listing of various methods employed for rabies Explaining the meth
Actinomyces Members of the genus Actinomyces are facultative anerobic, gram-positive, non acid-fast, non-spore forming, nonhaemolytic rods. All Actinomyces require rich media
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