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Symport and Antiport is the classification of ____________

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Symport and Antiport is the classification of ____________

(a) Primary active transport

(b) Secondary active transport

(c) Primary passive transport

(d) Secondary passive transport

I had been asked this question in quiz.

I want to ask this question from Movement of Substances Across Cell Membranes topic in chapter Cellular Membranes of Cell Biology

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Correct option is (b) Secondary active transport

Best explanation: Primary active transport involves hydrolysis of ATP or pyrophosphate or GTP to yied energy which helps in the transport of a particular molecule by utilization of that energy. Passive transport involves coupling the transport of one ion or molecule with the transport of another ion or molecule. It is of two types- Symport and Antiport. Symport refers to the pumping of two ions in the same direction of the cell membrane while Antiport refers to pumping of ions in the opposite direction.

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