Identify which descriptions represent a metabolic pathway, and which descriptions are not describing a metabolic pathway. Labels (1) Drop Zones Reset All A collection of unrelated enzymes at the plasma membrane \( \square \) Metabolic Pathway (1/2) One enzyme activates another enzyme, which activates another enzyme Not a metabolic pathway (2/2) Enzyme \( \dot{Q} \) breaks down substrate \( A \) into products \( X, Y \) and \( Z \) Enzyme P can have two possible substrates, \( R \) and \( S \)

To determine which descriptions represent a metabolic pathway and which do not, let's analyze each statement: 1. **A collection of unrelated enzymes at the plasma membrane** - This does not describe a metabolic pathway because it refers to enzymes that are not connected or functioning in a sequence or network. - **Label:** Not a metabolic pathway 2. **One enzyme activates another enzyme, which activates another enzyme** - This describes a series of enzymatic reactions where one enzyme influences the activity of another, indicating a sequential process typical of metabolic pathways. - **Label:** Metabolic Pathway 3. **Enzyme \( \dot{Q} \) breaks down substrate \( A \) into products \( X, Y \) and \( Z \)** - This describes a specific enzymatic reaction where a substrate is converted into multiple products, which is characteristic of a metabolic pathway. - **Label:** Metabolic Pathway 4. **Enzyme P can have two possible substrates, \( R \) and \( S \)** - This describes the versatility of an enzyme but does not indicate a sequence of reactions or a pathway. It simply states that one enzyme can act on two different substrates. - **Label:** Not a metabolic pathway ### Summary of Labels: - A collection of unrelated enzymes at the plasma membrane: **Not a metabolic pathway** - One enzyme activates another enzyme, which activates another enzyme: **Metabolic Pathway** - Enzyme \( \dot{Q} \) breaks down substrate \( A \) into products \( X, Y \) and \( Z \): **Metabolic Pathway** - Enzyme P can have two possible substrates, \( R \) and \( S \): **Not a metabolic pathway**