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Atype of protein that allows a particular molecule or ion to freely cross the plasma membrane as it enters or exits the cell
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Draw the structure of dna nucleotide with adenine as nitrogenous base
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Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins
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Atype of protein that allows a particular molecule or ion to freely cross the plasma membrane as it...
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