Question

Describe the direction in which sodium ions and a solute transported by secondary active transport move during co-transport and counter-transport.

Answer 1

In co-transport, sodium ions and a solute move in the same direction, while in counter-transport, they move in opposite directions.

Step-by-step explanation:

In co-transport, sodium ions and a solute move in the same direction, while in counter-transport, they move in opposite directions.

In co-transport, sodium ions and the solute are transported together across the plasma membrane by a symporter protein. The symporter uses the energy from the inward flood of sodium ions to move the solute against its concentration gradient.

In counter-transport, sodium ions and the solute are transported in opposite directions across the plasma membrane by an antiporter protein. The energy from the inward flood of sodium ions is used to move the solute out of the cell.