| Property | Simple Diffusion | Facilitated Transport | Active Transport |
|---|---|---|---|
| Requires special membrane proteins | No | $a$ | Yes |
| Transport saturates | No | Yes | $b$ |
| Uphill transport | $c$ | No | Yes |
| Requires $ATP$ energy | No | No | $d$ |
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| Property | Simple Diffusion | Facilitated Transport | Active Transport |
| Highly selective | No | Yes | ... |
| Uphill transport | ... | ... | Yes |
| Requires $ATP$ | ... | ... | ... |
| Column-$I$ | Column-$II$ |
|---|---|
| $P$. Uniport | $I$. $A$ molecule moves across the membrane independent of other molecules. |
| $Q$. Symport | $II$. Two molecules move in opposite directions. |
| $R$. Antiport | $III$. Two molecules cross the membrane in the same direction. |
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