secondary active transport across a membrane refers to a. movement of a molecule across a membrane and against its concentration gradient through a transporter that is directly powered by atp hydrolysis b. movement of a molecule across a membrane and against its concentration gradient powered by an ion gradient that is created by a different transporter c. movement of a molecule across a membrane powered by its own concentration gradient d. movement of a molecule across a membrane through a transporter that has an alpha-helical secondary structure. e. none of the above

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15-11-2022
Biology

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secondary active transport across a membrane refers to a. movement of a molecule across a membrane and against its concentration gradient through a transporter that is directly powered by atp hydrolysis b. movement of a molecule across a membrane and against its concentration gradient powered by an ion gradient that is created by a different transporter c. movement of a molecule across a membrane powered by its own concentration gradient d. movement of a molecule across a membrane through a transporter that has an alpha-helical secondary structure. e. none of the above

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contexto1212 contexto1212 · Answer 1 · 2022-11-18T07:47:05+01:00

secondary active transport across a membrane refers to (option b) the movement of a molecule across a membrane and against its concentration gradient powered by an ion gradient that is created by a different transporter.

A transporter protein couples the movement of an ion (typically Na+ or H+) down its electrochemical gradient with the uphill movement of another molecule or ion against a concentration/electrochemical gradient in secondary active transport across a biological membrane. As a result, another solute is transported against a concentration or electrochemical gradient by using energy stored in the ion's electrochemical gradient.

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