Final answer:
Active transport is the energy-requiring process of transporting molecules and ions against a concentration gradient using ATP as the energy source.
Explanation:
Active transport is the energy-requiring process of pumping molecules and ions across membranes against a concentration gradient. It involves the use of the cell's energy, usually in the form of adenosine triphosphate (ATP). An example of active transport is the sodium-glucose transporter that actively transports glucose into cells using a sodium gradient.
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