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| Libri | Libri |
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| Libri | Libri |
 Other substances diffuse across the cell membrane without an expenditure of cellular energy, but these substances require the assistance of a carrier molecule. The carrier molecule is a protein and is located in the cell membrane.  Wastewater Bacteria - Pagina 25 di Michael H. Gerardi - 2006 - 272 pagine Anteprima limitata -
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