Question

which equation best represents the aerobic respiration reaction?

1. pyruvic acid + lactic acid + atp
2. glucose → pyruvic acid + atp
3. pyruvic acid + oxygen → alcohol + carbon dioxide + atp
4. glucose + oxygen → carbon dioxide + water + atp

Explanation:

To solve this, we analyze each option based on aerobic respiration:

Step 1: Recall Aerobic Respiration

Aerobic respiration uses glucose and oxygen, producing \( \text{CO}_2 \), \( \text{H}_2\text{O} \), and ATP. The general equation is \( \text{Glucose} + \text{Oxygen}
ightarrow \text{Carbon Dioxide} + \text{Water} + \text{ATP} \).

Step 2: Analyze Each Option

• Option 1: Involves pyruvic acid and lactic acid (anaerobic, lactic acid fermentation). Eliminate.
• Option 2: Involves ethanol and pyruvic acid (anaerobic, alcoholic fermentation). Eliminate.
• Option 3: Pyruvic acid + oxygen → alcohol? Incorrect (aerobic doesn’t produce alcohol). Eliminate.
• Option 4: \( \text{Glucose} + \text{Oxygen}

ightarrow \text{Carbon Dioxide} + \text{Water} + \text{ATP} \) matches aerobic respiration.

Answer:

The option representing aerobic respiration is: \( \boldsymbol{\text{Glucose} + \text{Oxygen}
ightarrow \text{Carbon Dioxide} + \text{Water} + \text{ATP}} \) (the fourth option in the list).