In a .....A..... both molecules cross the mem | vedclass

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(D) In facilitated diffusion,some carrier proteins allow transport only if two types of molecules move together.$1$. In $Symport$,both molecules cross

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Symport $-$ Antiport

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(D) In facilitated diffusion,some carrier proteins allow transport only if two types of molecules move together.$1$. In $Symport$,both molecules cross the membrane in the same direction.$2$. In $Antiport$,the molecules move in opposite directions.$3$. In $Uniport$,a molecule moves across a membrane independent of other molecules.Therefore,$A$ represents $Symport$ and $B$ represents $Antiport$.

In a .....$A$..... both molecules cross the membrane in the same direction,in an ...$B$.... they move in opposite direction :
$A - B$

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In a .....$A$..... both molecules cross the membrane in the same direction,in an ...$B$.... they move in opposite direction :$A - B$