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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 is a food chain? The food chain is not branched it is linear sequence in which a living being serves as food for another, starting with the producers and going up to the d
Q. What is the kind of digestion that occurs in cnidarians? These animals have a digestive cavity and they make intracellular and extracellular digestion. The extracellular dig
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How brain thinks?
Describe how the structure of chromatin and chromosomes facilitates the following functions: a) DNA packaging. b) Regulation of gene expression. c) Replication at the
EVIDENC E IN FAVOUR OF THE MUTATION THOERY - Mutation theory can explain both progressive and retrogressive evolution and the occurrence of both changed and unchanged forms.
Q. What are the noteworthy features of the nervous system of arthropods? In arthropods the nervous system has more sophisticated sensory receptors with well-advanced cephalizat
Patient Care The primary basic principle in nutritional practice to be valid must be person/patient- centered. It must be based on initial and continuing identified nee
Restriction of physical activities to reduce myocardial work and oxygen consumption. However, care should be taken to prevent deep vein thrombosis. - Oxygen administration in dy
Shift of the phosphate group from carbon 3 to carbon 2 Shift of thephosphate group form carbon 3 to carbon 2: This reversible reaction is catalyzed by phosphoglycerate mutas
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