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Which is an example of active transport?

capturing sunlight to split water molecules in photosynthesis
capturing sunlight to split water molecules in photosynthesis

unwinding a strand of DNA prior to replication
unwinding a strand of DNA prior to replication

absorbing water through the cell membrane of a cell
absorbing water through the cell membrane of a cell

using energy to move waste materials out of a cell

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Active transport is a type of transport that requires energy to move substances across a membrane. It occurs against a concentration gradient.

  • The use of energy to move waste materials out of a cell is an EXAMPLE of transport active.

  • Active transport occurs against a concentration gradient, whereas passive transport (i.e., diffusion) occurs in favor of a concentration gradient.

  • Active transport can be mediated by membrane proteins that move substances from an area of high concentration to an area of low concentration.

  • This movement (active transport ) usually requires the energy provided by the hydrolysis of ATP.

  • Water molecules move across cellular membranes through membrane protein channels called aquaporins that act in favor of a concentration gradient (passive transport).

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