Which of the following is NOT a chemical substance found in cells?ProteinsCarbohydratesFats or lipidsEnzymes

To determine which of the options is NOT a chemical substance found in cells, we need to analyze each option individually.

1. Proteins: Proteins are indeed chemical substances found in cells. They play crucial roles in various cellular processes, such as structural support, enzymatic activity, and cell signaling.

2. Carbohydrates: Carbohydrates are also chemical substances found in cells. They serve as a primary source of energy and are involved in cell recognition and communication.

3. Fats or lipids: Fats or lipids are another type of chemical substance found in cells. They are essential for energy storage, insulation, and the formation of cell membranes.

4. Enzymes: Enzymes are not considered chemical substances found in cells. Instead, enzymes are proteins that act as catalysts, facilitating chemical reactions within cells.

Therefore, the correct answer is "Enzymes" as it is not a chemical substance found in cells.