Question

A transport system that moves one solute into the cell and another one out of the cell during a single cycle accompanied by the expenditure of energy through ATP hydrolysis could be called a(n) _______

1) active antiport
2) active uniport
3) passive antiport
4) active symport
5) passive symport

Answer 1

The transport system described moves two substances in opposite directions with ATP expenditure, characterizing it as an active antiport. Therefore, the correct option is 1). active antiport.

Step-by-step explanation:

The transport system described in the question is one that moves two substances in different directions and requires energy in the form of ATP. This is a characteristic of an active antiport system. In an active antiport, one solute is transported into the cell while another is transported out, both against their concentration gradients, which is achieved through the hydrolysis of ATP.

This contrasts with symport systems, which move substances in the same direction, and uniport systems, which move a single substance in one direction. Therefore, the correct option in the final answer for a transport system that moves one solute into the cell and another out with the expenditure of ATP is active antiport.