The statements below are about how substances move into and out of cells. 1 Energy from respiration is needed. 2 Energy from respiration is not needed. 3 The movement takes place down a concentration gradient. 4 The overall movement is from a region of higher concentration to a region of lower concentration. 5 The overall movement is from a region of lower concentration to a region of higher concentration. Which statements apply to active transport?
- A1 and 3
- B1 and 5
- C2 and 4 only
- D2, 4 and 5