Which of the following does not affect the function of enzymes?
a. ubiquinone
b. substrate concentration
c. temperature
d. competitive inhibitors

Verified step by step guidance

1. Understand that enzymes are biological catalysts that speed up chemical reactions in cells.
2. Identify factors that typically affect enzyme activity: substrate concentration, temperature, pH, and inhibitors.
3. Recognize that competitive inhibitors are molecules that bind to the active site of an enzyme, preventing substrate binding, thus affecting enzyme function.
4. Acknowledge that temperature affects enzyme activity by influencing molecular movement and enzyme stability.
5. Consider that ubiquinone is a coenzyme involved in electron transport, not directly affecting enzyme activity in the context of this question.

Key Concepts

Enzyme Function

Enzymes are biological catalysts that speed up chemical reactions in cells by lowering the activation energy required. Their function can be influenced by various factors, including substrate concentration, temperature, and the presence of inhibitors. Understanding how these factors affect enzyme activity is crucial for grasping metabolic processes.

Factors Affecting Enzymes

Several factors can influence enzyme activity, including substrate concentration, which affects the rate of reaction until saturation is reached. Temperature can alter enzyme shape and activity, while competitive inhibitors bind to the active site, preventing substrate binding. Recognizing these factors helps in understanding enzyme kinetics and regulation.

Ubiquinone

Ubiquinone, also known as coenzyme Q, is a lipid-soluble molecule that plays a critical role in the electron transport chain within mitochondria. Unlike the other options listed, ubiquinone does not directly affect enzyme function but rather participates in electron transfer processes. Its role is more about energy production than enzyme activity modulation.