Cellular Networks

Step 1: Understand Cellular Energy Currency. The primary energy currency of cells is adenosine triphosphate (ATP). ATP is a high-energy molecule that stores and releases energy in cells through its chemical bonds. Cells use ATP to power various cellular processes, such as muscle contraction, active transport, and biosynthesis. Step 2: Analyze Each Option.
Option (1): Fat — Incorrect, as fats are stored energy sources but not the primary energy currency of cells.
Option (2): Protein — Incorrect, as proteins are essential macromolecules involved in structure and function but not the direct energy currency.
Option (3): ADP — Incorrect, as ADP (adenosine diphosphate) is a product of ATP hydrolysis and does not serve as the primary energy currency.
Option (4): ATP — Correct, as ATP is the universal energy currency of cells. Step 3: Final Answer. $ $