Final answer:
It is true that primary active transporters, which use ATP to move ions or small molecules, are similar to carriers since both can move ions against their electrochemical gradient.
Step-by-step explanation:
The statement that primary active transporters are similar to carriers in that they both move ions against their electrochemical gradient is true. Primary active transport involves the movement of ions or small molecules across a membrane, often creating a difference in charge across that membrane. This process is directly dependent on ATP for the energy required to move substances against their concentration or electrochemical gradient. Carrier proteins facilitate this movement, and these proteins are referred to as pumps when they are involved in active transport.