Question

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In (primary or secondary) active transport, one species of solute moves (with or against) its electrochemical gradient, allowing a different species to move (with or against) its own electrochemical gradient. This movement is in contrast to (primary or secondary) active transport, in which all solutes are moved (with or against) their concentration gradients, fueled by ATP.

Answer 1

In secondary active transport, one species of solute moves with its electrochemical gradient, allowing a different species to move against its own electrochemical gradient. This movement is in contrast to primary active transport, in which all solutes are moved against their concentration gradients, fueled by ATP.

(Active transport is a type of transport, in which, molecules are moved against their concentration gradient, that is, from their low to high concentration. This process, unlike passive transport, requires energy. Based on the way of obtaining energy, active transport is categorized into- primary active transport and secondary active transport.

In primary active transport, energy for moving a molecule against it's concentration gradient comes directly from ATP hydrolysis, whereas, in secondary active transport, one molecule moves down it's concentration gradient, this movement provides energy for the transport of another molecule against it's concentration gradient). Both these processes have been shown in the following diagram-