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membrane plasmique - Poly-Prepas

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Un cas particulier de transport actif: le cotransport<br />

Ex. Transport du saccharose:<br />

1. Transport actif de<br />

H + par la pompe à<br />

proton<br />

2. Formation d’un<br />

gradient (différence)<br />

de concentration<br />

et d’un gradient<br />

électrique de part et<br />

d’autre de la <strong>membrane</strong><br />

[H + ] [H + ]<br />

+<br />

86

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