Final answer:
The term for two different molecules being transported together in the same direction is 'symporter', which is a type of carrier protein used for active transport in cells.
Step-by-step explanation:
The term that means two different molecules are transported together in the same direction is symporter. This is a specific type of carrier protein involved in active transport. Symporters are secondary active transporters that move two substances in the same direction across the cell membrane. An example of this is the sodium-glucose symporter, which uses the flow of sodium ions into the cell—enabled by the sodium-potassium pump—to 'pull' glucose molecules into the cell against their concentration gradient.
This mechanism is crucial for transporting glucose into cells for energy. Without this process, and the energy it derives from the movement of sodium ions, glucose would not be able to enter the cell effectively. Symporters are a vital part of the cellular transport system, which includes other transporters like uniporters and antiporters as well.