Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 5 - No. 4)
In which of the following scenarios is active transport most likely to be used?
Moving glucose from an area of high concentration to an area of low concentration.
Moving oxygen into the blood from the lungs.
Moving sodium ions from the blood into a kidney cell.
Moving carbon dioxide out of a cell.
Explanation
Active transport moves molecules against a concentration gradient, which means it is most likely used when moving a substance from an area of low concentration to an area of high concentration.
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