Cellular Respiration Overview Worksheet: Stages of energy production from glucose in a cell.
Diagram illustrating cellular respiration stages in a cell, showing glycolysis in the cytoplasm, the Krebs cycle in the mitochondria, and electron transport chain producing ATP, with labeled components and energy output.
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Show Answer Key & Explanations
Step-by-step solution for: Cellular Respiration Overview Worksheet Chapter 7
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Show Answer Key & Explanations
Step-by-step solution for: Cellular Respiration Overview Worksheet Chapter 7
Absolutely! Let’s solve this Cellular Respiration Overview Worksheet step by step, based on standard biology curriculum (typically for high school or introductory college biology).
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## ✔ Cellular Respiration Basics — Answers
> Cellular respiration is the process by which cells break down organic molecules (like glucose) in the presence of oxygen to produce usable energy in the form of ATP (adenosine triphosphate), releasing carbon dioxide and water as waste products.
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> All living organisms — including plants, animals, fungi, protists, and most bacteria — perform cellular respiration to generate ATP. Even though plants perform photosynthesis, they still need cellular respiration to power their cells at night or in non-photosynthetic tissues.
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> The main stages occur in different parts:
> - Glycolysis: occurs in the cytoplasm
> - Krebs Cycle (Citric Acid Cycle): occurs in the mitochondrial matrix
> - Electron Transport Chain (ETC): occurs in the inner mitochondrial membrane
> So, while glycolysis starts in the cytoplasm, the majority of ATP production happens in the mitochondria — often called the “powerhouse of the cell.”
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> C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP (energy)
> This shows one molecule of glucose reacting with six molecules of oxygen to produce six molecules of carbon dioxide, six molecules of water, and energy stored in ATP.
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> Glucose + Oxygen → Carbon Dioxide + Water + Energy (ATP)
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> The reactants (starting materials) are:
> - Glucose (C₆H₁₂O₆)
> - Oxygen (O₂)
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> To produce ATP, the universal energy currency of the cell, which powers all cellular activities like muscle contraction, active transport, synthesis of macromolecules, and cell division.
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## 🧬 FILL IN THE BLANKS IN THE DIAGRAM
The diagram shows the three main stages of aerobic cellular respiration:
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- Occurs in the cytoplasm
- Glucose (6-carbon sugar) is broken into two 3-carbon molecules of pyruvate
- Produces a net gain of 2 ATP and 2 NADH
→ So, label Stage 1 as Glycolysis
→ The green box should say: Glycolysis
→ The molecule entering: Glucose (C₆H₁₂O₆)
→ The output from Stage 1 going into mitochondria: Pyruvate (or 2 Pyruvate molecules)
→ Also labeled: 2 ATP produced here (net)
→ And 2 NADH produced (shown as little red circles with “2” next to them)
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- Occurs in the mitochondrial matrix
- Each pyruvate is converted to Acetyl CoA before entering the cycle
- For each glucose → 2 turns of the cycle → produces:
- 2 ATP (or GTP)
- 6 NADH
- 2 FADH₂
- 4 CO₂ (waste)
→ Label Stage 2 as Krebs Cycle or Citric Acid Cycle
→ Input: Pyruvate → Acetyl CoA (often shown as transition step)
→ Output: CO₂ (released), NADH, FADH₂, and ATP
→ You’ll see arrows pointing to ATP and NADH/FADH₂ being produced here.
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- Occurs in the inner mitochondrial membrane
- Uses electrons from NADH and FADH₂ to create a proton gradient
- Drives ATP synthase to produce large amounts of ATP (~26–28 per glucose)
- Final electron acceptor is oxygen (O₂) → forms water (H₂O)
→ Label Stage 3 as Electron Transport Chain or Oxidative Phosphorylation
→ Input: NADH and FADH₂ from previous stages
→ Output: 大量 ATP (about 26–28), H₂O
→ The “12” likely refers to 12 H₂O molecules produced (since 6 O₂ → 6 H₂O per glucose, but sometimes diagrams show total water formed across all stages)
→ The “6” near the O₂ input → represents 6 oxygen molecules
→ The “2” near the H₂O output → might be per turn or simplified; actually, 6 H₂O are produced per glucose.
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## 📊 Summary of ATP Yield Per Glucose Molecule:
| Stage | ATP Produced |
|---------------------|--------------|
| Glycolysis | 2 ATP |
| Krebs Cycle | 2 ATP |
| ETC / Oxidative Phos.| ~26–28 ATP |
| Total | ~30–32 ATP |
*(Note: Some textbooks say “About 36” or “About 38” — it varies slightly depending on how NADH from glycolysis is shuttled into mitochondria. But modern consensus is ~30–32.)*
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## 🟩 FINAL ANSWERS TO FILL IN THE DIAGRAM:
> Stage 1: Glycolysis
> Stage 2: Krebs Cycle (or Citric Acid Cycle)
> Stage 3: Electron Transport Chain (or Oxidative Phosphorylation)
> Arrows labeled "2" next to red dots = NADH (and maybe FADH₂)
> Arrows labeled "6" near O₂ = 6 Oxygen molecules
> Arrows labeled "12" near H₂O = 12 Water molecules (though technically 6 per glucose — may be diagram simplification)
> ATP labels: 2 (glycolysis), 2 (Krebs), ~26–28 (ETC) → Total ≈ 30–32 ATP
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✔ Bonus Tip: Remember the mnemonic:
“Glycolysis in Cytoplasm, Krebs in Matrix, ETC on Membrane!”
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Let me know if you want a printable version or a diagram explanation with labels!
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## ✔ Cellular Respiration Basics — Answers
1. Define Cellular Respiration.
> Cellular respiration is the process by which cells break down organic molecules (like glucose) in the presence of oxygen to produce usable energy in the form of ATP (adenosine triphosphate), releasing carbon dioxide and water as waste products.
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2. What organisms perform cellular respiration?
> All living organisms — including plants, animals, fungi, protists, and most bacteria — perform cellular respiration to generate ATP. Even though plants perform photosynthesis, they still need cellular respiration to power their cells at night or in non-photosynthetic tissues.
---
3. Where in the cell does cellular respiration occur? (which organelle)
> The main stages occur in different parts:
> - Glycolysis: occurs in the cytoplasm
> - Krebs Cycle (Citric Acid Cycle): occurs in the mitochondrial matrix
> - Electron Transport Chain (ETC): occurs in the inner mitochondrial membrane
> So, while glycolysis starts in the cytoplasm, the majority of ATP production happens in the mitochondria — often called the “powerhouse of the cell.”
---
4. What is the chemical equation for cellular respiration?
> C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP (energy)
> This shows one molecule of glucose reacting with six molecules of oxygen to produce six molecules of carbon dioxide, six molecules of water, and energy stored in ATP.
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5. What is the equation in words for cellular respiration?
> Glucose + Oxygen → Carbon Dioxide + Water + Energy (ATP)
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6. What are the reactants for cellular respiration?
> The reactants (starting materials) are:
> - Glucose (C₆H₁₂O₆)
> - Oxygen (O₂)
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7. What is the ultimate function of cellular respiration?
> To produce ATP, the universal energy currency of the cell, which powers all cellular activities like muscle contraction, active transport, synthesis of macromolecules, and cell division.
---
## 🧬 FILL IN THE BLANKS IN THE DIAGRAM
The diagram shows the three main stages of aerobic cellular respiration:
---
🔹 Stage 1: Glycolysis
- Occurs in the cytoplasm
- Glucose (6-carbon sugar) is broken into two 3-carbon molecules of pyruvate
- Produces a net gain of 2 ATP and 2 NADH
→ So, label Stage 1 as Glycolysis
→ The green box should say: Glycolysis
→ The molecule entering: Glucose (C₆H₁₂O₆)
→ The output from Stage 1 going into mitochondria: Pyruvate (or 2 Pyruvate molecules)
→ Also labeled: 2 ATP produced here (net)
→ And 2 NADH produced (shown as little red circles with “2” next to them)
---
🔹 Stage 2: Krebs Cycle (Citric Acid Cycle)
- Occurs in the mitochondrial matrix
- Each pyruvate is converted to Acetyl CoA before entering the cycle
- For each glucose → 2 turns of the cycle → produces:
- 2 ATP (or GTP)
- 6 NADH
- 2 FADH₂
- 4 CO₂ (waste)
→ Label Stage 2 as Krebs Cycle or Citric Acid Cycle
→ Input: Pyruvate → Acetyl CoA (often shown as transition step)
→ Output: CO₂ (released), NADH, FADH₂, and ATP
→ You’ll see arrows pointing to ATP and NADH/FADH₂ being produced here.
---
🔹 Stage 3: Electron Transport Chain (ETC) & Oxidative Phosphorylation
- Occurs in the inner mitochondrial membrane
- Uses electrons from NADH and FADH₂ to create a proton gradient
- Drives ATP synthase to produce large amounts of ATP (~26–28 per glucose)
- Final electron acceptor is oxygen (O₂) → forms water (H₂O)
→ Label Stage 3 as Electron Transport Chain or Oxidative Phosphorylation
→ Input: NADH and FADH₂ from previous stages
→ Output: 大量 ATP (about 26–28), H₂O
→ The “12” likely refers to 12 H₂O molecules produced (since 6 O₂ → 6 H₂O per glucose, but sometimes diagrams show total water formed across all stages)
→ The “6” near the O₂ input → represents 6 oxygen molecules
→ The “2” near the H₂O output → might be per turn or simplified; actually, 6 H₂O are produced per glucose.
---
## 📊 Summary of ATP Yield Per Glucose Molecule:
| Stage | ATP Produced |
|---------------------|--------------|
| Glycolysis | 2 ATP |
| Krebs Cycle | 2 ATP |
| ETC / Oxidative Phos.| ~26–28 ATP |
| Total | ~30–32 ATP |
*(Note: Some textbooks say “About 36” or “About 38” — it varies slightly depending on how NADH from glycolysis is shuttled into mitochondria. But modern consensus is ~30–32.)*
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## 🟩 FINAL ANSWERS TO FILL IN THE DIAGRAM:
> Stage 1: Glycolysis
> Stage 2: Krebs Cycle (or Citric Acid Cycle)
> Stage 3: Electron Transport Chain (or Oxidative Phosphorylation)
> Arrows labeled "2" next to red dots = NADH (and maybe FADH₂)
> Arrows labeled "6" near O₂ = 6 Oxygen molecules
> Arrows labeled "12" near H₂O = 12 Water molecules (though technically 6 per glucose — may be diagram simplification)
> ATP labels: 2 (glycolysis), 2 (Krebs), ~26–28 (ETC) → Total ≈ 30–32 ATP
---
✔ Bonus Tip: Remember the mnemonic:
“Glycolysis in Cytoplasm, Krebs in Matrix, ETC on Membrane!”
---
Let me know if you want a printable version or a diagram explanation with labels!
Parent Tip: Review the logic above to help your child master the concept of chapter 7 worksheet.
