A-LevelBiologyCell membranes and transport9700/12 · May/June 2016 · Q141 Mark
Which statements about active transport are always correct? 1 It does not require a membrane. 2 It occurs against the concentration gradient. 3 It moves oxygen molecules.
A1, 2 and 3
B1 and 3 only
C1 only
D2 only
✓ Correct answer
D: 2 only
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