The characteristic property of a metabolically active cell is its high rate of biochemical reactions. This means that the cell is constantly engaging in the processes of anabolism (building up complex molecules) and catabolism (breaking down complex molecules), which are collectively known as metabolism.

Here are some key indicators of a metabolically active cell:

* High energy demand: Active cells require a constant supply of energy to fuel their various processes. This is often indicated by a high rate of ATP production (the cell's energy currency).

* Active transport: Metabolically active cells often transport molecules across their membranes, requiring energy for this process.

* Rapid synthesis and degradation of molecules: These cells are continuously building and breaking down proteins, carbohydrates, lipids, and other biomolecules.

* High enzyme activity: Enzymes are the catalysts of metabolic reactions. Active cells have high concentrations of enzymes that drive these reactions.

* Rapid growth and division: Metabolically active cells often have a high rate of growth and division.

* Active communication: These cells may actively communicate with other cells through signaling pathways.

In essence, a metabolically active cell is a dynamic system with a high turnover rate of molecules and energy, constantly adapting to its environment and fulfilling its specific functions within the organism.