Active transport

active transport
energy-expanding process in which cells transport materials across the cell membrane against a concentration gradient.
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Active transport is the mediated transport of biochemicals, and other atomic/molecular substances, across membranes. Unlike passive transport, this process requires chemical energy.
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Active transport is the pumping of molecules or ions through a membrane against their concentration gradient. It requires:
a transmembrane protein (usually a complex of them) called a transporter and
energy. The source of this energy is ATP.
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Active transport is like a water pump; it uses energy to pump water uphill where a siphon cannot. Facilitated diffusion (see above) is like a siphon in that additional energy is not required but it can only allow movement downhill.
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active transport: the movement of molecules across a membrane from a region of low concentration to a region of high concentration that requires the expenditure of energy (ATP).
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Active transport
Main article: Active transport
Typically moves molecules against their electrochemical gradient, a process that would be entropically unfavorable were it not stoichiometrically coupled with the hydrolysis of ATP.
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active transport Transport of molecules against a concentration gradient (from regions of low concentration to regions of high concentration) with the aid of proteins in the cell membrane and energy from ATP. PICTURE ...
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active transport
The movement of a substance across a biological membrane against its concentration or electrochemical gradient, with the help of energy input and specific transport proteins.
adaptation ...
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active transport A process that requires an expenditure of ATP energy to move molecules across a cell membrane; usually moved against the concentration gradient with the aid of specific transport proteins.
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active transport - movement of a molecule across a membrane or other barrier driven by energy other than that stored in the concentration gradient or electrochemical gradient of the transported molecule ...
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active site The region of an enzyme that binds a substrate molecule and catalytically transforms it, usually a small portion of the total enzyme molecule active transport Energy-requiring transport of a solute across a membrane in the direction of ...
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