Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 1 - No. 3)
Which of the following is an example of active transport?
The movement of oxygen from the lungs into the bloodstream.
The movement of water molecules across a cell membrane.
The uptake of glucose by the cells lining the small intestine.
The diffusion of carbon dioxide from cells into the bloodstream.
Explanation
Active transport requires energy to move molecules against their concentration gradient. Glucose uptake is an example.
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