Is energy essential for the transport of substances in and out of the cell?
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As plasma membrane is present there if diffusion occurs then no need of energy
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Passive transport requires no energy from the cell. Examples include the diffusion of oxygen and carbon dioxide, osmosis of water, and facilitated diffusion. Image from W.H. Freeman and Sinauer Associates, used by permission. Active transport requires the cell to spend energy, usually in the form of ATP.
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