Section 4 Lesson 2
Cellular Respiration Study Questions
Learning Objectives
• Identify ATP as the major energy carrier for cells.
• Analyze the inputs to and outputs of the stages of cellular respiration.
• Describe fermentation as an anaerobic process.
1. What is the main purpose of cellular respiration?
Cellular respiration’s main purpose is to generate ATP so the cell can
perform functions.
2. Process of cellular respiration
2.1. Which organisms perform cellular respiration?
All living organisms, including plants and animals, perform cellular
respiration.
2.2. What are the three stages of cellular respiration?
The three stages of cellular respiration are glycolysis, the Krebs
cycle, and the electron transport chain.
2.3. Write the overall chemical reaction of cellular respiration. There are
two inputs and three outputs.
The inputs are glucose and oxygen, and the outputs are ATP, carbon
dioxide, and water.
3. Energy carrier, ATP
3.1. What is the function of ATP?
ATP stores and provides energy for cellular activities.
3.2. How does ADP become ATP?
ADP becomes ATP when a phosphate group is added.
4. Electron carriers, NADH and FADH2
4.1. What is the function of NADH and FADH2?
1 | Section 4 Lesson 2
, NADH and FADH₂ carry high-energy electrons.
4.2. Which stage of cellular respiration provides NADH only?
Glycolysis produces NADH only.
4.3. Which stage of cellular respiration provides NADH and FADH2?
The Krebs cycle produces both NADH and FADH₂.
4.4. Which stage of cellular respiration receives NADH and FADH2?
The electron transport chain uses NADH and FADH₂ to make ATP.
5. Three stages of cellular respiration
5.1. Glycolysis
5.1.1. Where does glycolysis take place in the cell?
Glycolysis occurs in the cytoplasm and converts glucose into pyruvate
while producing ATP and NADH.
5.1.2. List three inputs of glycolysis.
Glucose, ATP, and NAD⁺
5.1.3. List three outputs of glycolysis.
Pyruvate, ATP, and NADH
5.2. Krebs Cycle
5.2.1. Where does Krebs Cycle take place in the cell?
The Krebs cycle takes place in the mitochondria.
5.2.2. List four inputs of Krebs Cycle.
Pyruvate, NAD⁺, FAD, and ADP
5.2.3. List four outputs of Krebs Cycle.
Carbon dioxide, NADH, FADH₂, and ATP
5.3. Electron transport chain (ETC)
5.3.1. Where does electron transport chain take place in the cell?
The electron transport chain takes place in the inner mitochondrial
membrane.
5.3.2. List three inputs of ETC.
Oxygen, NADH, and FADH₂
5.3.3. List four outputs of ETC.
2 | Section 4 Lesson 2
Cellular Respiration Study Questions
Learning Objectives
• Identify ATP as the major energy carrier for cells.
• Analyze the inputs to and outputs of the stages of cellular respiration.
• Describe fermentation as an anaerobic process.
1. What is the main purpose of cellular respiration?
Cellular respiration’s main purpose is to generate ATP so the cell can
perform functions.
2. Process of cellular respiration
2.1. Which organisms perform cellular respiration?
All living organisms, including plants and animals, perform cellular
respiration.
2.2. What are the three stages of cellular respiration?
The three stages of cellular respiration are glycolysis, the Krebs
cycle, and the electron transport chain.
2.3. Write the overall chemical reaction of cellular respiration. There are
two inputs and three outputs.
The inputs are glucose and oxygen, and the outputs are ATP, carbon
dioxide, and water.
3. Energy carrier, ATP
3.1. What is the function of ATP?
ATP stores and provides energy for cellular activities.
3.2. How does ADP become ATP?
ADP becomes ATP when a phosphate group is added.
4. Electron carriers, NADH and FADH2
4.1. What is the function of NADH and FADH2?
1 | Section 4 Lesson 2
, NADH and FADH₂ carry high-energy electrons.
4.2. Which stage of cellular respiration provides NADH only?
Glycolysis produces NADH only.
4.3. Which stage of cellular respiration provides NADH and FADH2?
The Krebs cycle produces both NADH and FADH₂.
4.4. Which stage of cellular respiration receives NADH and FADH2?
The electron transport chain uses NADH and FADH₂ to make ATP.
5. Three stages of cellular respiration
5.1. Glycolysis
5.1.1. Where does glycolysis take place in the cell?
Glycolysis occurs in the cytoplasm and converts glucose into pyruvate
while producing ATP and NADH.
5.1.2. List three inputs of glycolysis.
Glucose, ATP, and NAD⁺
5.1.3. List three outputs of glycolysis.
Pyruvate, ATP, and NADH
5.2. Krebs Cycle
5.2.1. Where does Krebs Cycle take place in the cell?
The Krebs cycle takes place in the mitochondria.
5.2.2. List four inputs of Krebs Cycle.
Pyruvate, NAD⁺, FAD, and ADP
5.2.3. List four outputs of Krebs Cycle.
Carbon dioxide, NADH, FADH₂, and ATP
5.3. Electron transport chain (ETC)
5.3.1. Where does electron transport chain take place in the cell?
The electron transport chain takes place in the inner mitochondrial
membrane.
5.3.2. List three inputs of ETC.
Oxygen, NADH, and FADH₂
5.3.3. List four outputs of ETC.
2 | Section 4 Lesson 2
