Question

i) The process of movement of molecules against concentration gradient using energy.
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Answer 1

Answer:

Active transport is the energy-requiring process of pumping molecules and ions across membranes "uphill" - against a concentration gradient. The active transport of small molecules or ions across a cell membrane is generally carried out by transport proteins that are found in the membrane.

Answer 2

Active transport: moving against a gradient

To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells.

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