11 mark
Which statements about active transport are correct?
| 1 | Ions move from a region of high concentration to a region of low concentration. |
| 2 | Ions move across the cell membrane. |
| 3 | Energy released during respiration is used to move ions into or out of a cell. |
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
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