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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.
Define Supplementary feeding to control under nutrition? Supplementary feeding has remained an important component to control under nutrition. Considering the dietary inadequac
Agrostology : This is related to all types of grasses. Agrostology is sometimes called as graminology. Agrostology is the scientific study of grasses. It typically encompasses the
A dialogue and cartoon between haemoglobin and chlorophyll
Q. What is the location of the salivary glands in humans? There are six major salivary glands and they are located one in each parotid gland, two beneath the mandibles (submand
Steam treatment Steam treatment of crop residues under pressure has recently opened a new vista for their nutritional improvement especially in the situation when steam availab
Assessment Infective endocarditis is characterised by insidious onset of fever, malaise, night- sweats and weight loss. Other signs include vomiting, fatigue, headache, mya
what is an autotroph?
Q. Which are the germ layers present in cnidarians? Which tissues of the animal do they originate? These beings present endoderm and ectoderm, two germ layers. Animals only wit
The female I-1 and her mate, male I-2, had four children, one of whom has albinism. What is the probability that they could have had a total of four children with any other outcome
How is energy transferred along a food chain? The energy flux beside a food chain is always unidirectional, from the producers to the decomposers.
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