Which of the following is NOT an example of metabolism?

• A. Digestion of food
• B. Energy production within the cell
• C. Controlling basic cell functions
• D. Conversion of nutrients into energy

Answer: (C)

The correct choice highlights that "controlling basic cell functions" is not a direct example of metabolism. Metabolism refers specifically to the biochemical processes that occur within living organisms to maintain life, encompassing two main categories: catabolism (breaking down molecules to produce energy) and anabolism (using energy to construct components of cells such as proteins and nucleic acids).

In contrast, digestion of food, energy production within the cell, and the conversion of nutrients into energy are all processes that fall under the umbrella of metabolism. Digestion involves breaking down food into smaller components that can be absorbed and utilized by the body. Energy production within cells occurs through metabolic pathways like cellular respiration, where glucose is converted into ATP, the energy currency of the cell. The conversion of nutrients into energy is the essence of metabolism, as it underscores the transformation of consumed substances into usable energy.

Therefore, the activity of "controlling basic cell functions" is more about regulation and organization within the cell rather than a metabolic process itself, which makes it distinct from the other options that involve direct metabolic actions.