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 $$ S $$

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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**
- **Not a metabolic pathway:** A collection of unrelated enzymes at the plasma membrane - **Metabolic Pathway:** One enzyme activates another enzyme, which activates another enzyme; Enzyme $$ \dot{Q} $$ breaks down substrate $$ A $$ into products $$ X, Y $$ and $$ Z $$ - **Not a metabolic pathway:** Enzyme P can have two possible substrates, $$ R $$ and $$ S $$

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