Final answer:
The energy for active transport comes from the ATP molecule, which provides energy for carrier proteins to move substances against their concentration gradient. The correct option is c) The ATP molecule
Step-by-step explanation:
The energy used for active transport comes from the ATP molecule. Active transport is a cellular process that moves molecules from an area of low concentration to an area of high concentration, often against their concentration gradient. This requires energy, which is provided by the hydrolysis of ATP (adenosine triphosphate).
ATP is known to be the main energy currency of the cell, and when it is hydrolyzed (broken down), it releases energy that can be used by carrier proteins in the cell membrane to move substances.
One well-known example of active transport is the sodium-potassium pump, which exchanges sodium for potassium across a cell's plasma membrane, utilizing energy from ATP to do so. The correct option is c) The ATP molecule