TY - BOOK ED - Open University TI - Active transport PY - 1975/// CY - Milton Keynes PB - Open University KW - Cells N1 - According to the so-called ion gradient hypothesis the spontaneous movements of sodium ions and possibly potassium ions across the cell membrane of mammalian cells provides the energy needed to concentrate amino acids within the cell. This'sodium gradient' hypothesis is explained by a leading exponent, Prof, Eddy; Bahan rosak (Lupus) ER -