Review Questions

Which of the following is the primary purpose of cellular respiration?
A) To produce glucose
B) To convert solar energy into chemical energy
C) To generate ATP
D) To break down ATP into ADP

Fill in the blank: The first stage of cellular respiration, which occurs in the cytoplasm, is called __________.

How many net ATP molecules are produced from glycolysis?

Which of the following correctly lists the main stages of aerobic cellular respiration in order?
A) Electron transport chain → Glycolysis → Krebs cycle
B) Glycolysis → Krebs cycle → Electron transport chain
C) Krebs cycle → Glycolysis → Fermentation
D) Glycolysis → Fermentation → Electron transport chain

What molecule is the final electron acceptor at the end of the electron transport chain?

True or False: The Krebs cycle takes place in the cytoplasm.

Match the stage of respiration (Column A) with its main product (Column B):

1. Column A

   1. Glycolysis

   2. Krebs cycle (Citric Acid Cycle)

   3. Electron transport chain

2. Column B
   A. NADH and FADH₂
   B. ATP and pyruvate
   C. Large amounts of ATP and water

Fill in the blank: The process of breaking down glucose without oxygen is called __________.

Compare the amount of ATP generated by aerobic respiration vs. anaerobic fermentation.

Which of the following is a product of alcoholic fermentation?
A) Lactic acid
B) Oxygen
C) Ethanol
D) Glucose

Short answer: Why does lactic acid build up in muscle cells during intense exercise?

Fill in the blank: In aerobic respiration, one molecule of glucose can yield up to about __________ ATP molecules.

Which organelle is the site of most steps of aerobic cellular respiration in eukaryotic cells?

Explain why NADH and FADH₂ are considered “electron carriers” in cellular respiration.

Application: If a poison blocks the electron transport chain, what would happen to ATP production and why?