Study Guide Section 4.4: Cellular Respiration
Vocabulary
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Cellular respiration
Aerobic
Anaerobic
Glycolysis
Krebs cycle
Mitochondria (review)
ATP
Electron Transport Chain
Review questions
1. What is the function of cellular respiration?
It produces ATP for cellular activity.
2. Glycolysis is an anaerobic process. What does this mean?
Glycolysis does not need oxygen to take place.
3. How are cellular respiration and glycolysis related?
Glycolysis breaks down glucose in the cytoplasm, anaerobically, before cellular respiration occurs
in the mitochondria. The aerobic processes of the mitochondria use the products of glycolysis.
4. What are the reactants and products in cellular respiration?
The reactants are three-carbon molecules, from glycolysis, and oxygen. The products are water
and carbon dioxide – and of course ATP.
5. Does glucose actually react with oxygen during cellular respiration? Explain.
No, glucose is split by glycolysis prior to the aerobic parts of cellular respiration, when oxygen
enters the process. Glycolysis is an anaerobic process.
6. Where in the cell does the Krebs cycle take place?
In the matrix of the mitochondrion
7. What are the products of the Krebs cycle?
Carbon dioxide and energy carrying molecules.
8. Summarize the aerobic stages of cellular respiration. Be sure to discuss the Krebs cycle and electron
transport chain in your answer.
Your answers should indicate that the products of glycolysis are broken down by the Krebs cycle
to make energy-carrying molecules and carbon dioxide. Energy from the Krebs cycle is used by
the electron transport chain to make ATP. Detail is good in this answer; it shows that you
understand cellular respiration.
9.
Describe the relationship between cellular respiration and photosynthesis. Discuss the functions of
chloroplasts and mitochondria.
The reactants and products of the two processes are essentially the reverse of each other. The
chloroplasts and mitochondria also have approximately opposite functions. Chloroplasts absorb
energy and build carbon-based molecules while mitochondria break down carbon-based
molecules to release energy.
10. Is the process of cellular respiration exothermic or endothermic? Explain your answer.
Exothermic; energy is released as heat and ATP.
11. What is transferred to the chain of proteins in the electron transport chain?
High energy molecules