4.4 Study Guide Overview of Cellular Respiration Worksheet KEY

[Pages:2]4.4 Study Guide | Overview of Cellular Respiration | KEY

Directions: Answer the questions using your notes, your knowledge, and or section 4.4 from the textbook.

1. What is cellular respiration? A process that releases energy from sugars and other carbon-based molecules to make ATP when OXYGEN is present.

2. Why is cellular respiration called an aerobic process? Cellular Respiration needs OXYGEN to take place.

3. Where does cellular respiration take place? Cellular respiration takes place in mitochondria.

4. What happens during glycolysis? In the cell's cytoplasm, a molecule of glucose is split into 2 pyruvate molecules (a 3-carbon molecule) and 2 ATP molecules are formed.

5. What does it mean to say that glycolysis is an anaerobic process? Glycolysis is a process that takes place WITHOUT oxygen.

6. In what two ways does cellular respiration seem to be the opposite of photosynthesis? Cellular respiration breaks down sugars to make ATP, while photosynthesis creates sugars. The processes overall chemical equations are the reverse of each other.

7. In which two parts of a mitochondrion does cellular respiration take place? The matrix and the inner mitochondrial membrane.

8. Write the chemical equation for the overall process of cellular respiration. a. Identify the reactants, products, and the meaning of the several arrows.

Reactants Creates Products

C6H12O6 + 6O2 ??????? 6CO2 + 6H20

9. Explain what the equation of cellular respiration means. A six-carbon sugar (such as glucose) and oxygen, the reactants, enter the mitochondrion for the processes of cellular respiration. Through a series of chemical reactions ATP is produced. Then carbon dioxide and water, the products, are formed.

10. Sketch and label a mitochondrion with the following:

a. Reactants, products, & structures (Krebs cycle, electron transport chain, matrix, inner membrane).

Cellular Respiration

11. List the 4 steps of cellular respiration that take place in the mitochondrion a. 2 pyruvate enter the Krebs cycle, ATP molecules are formed, carbon dioxide is released as a waste. b. Energy formed from the Krebs cycle is transferred to the electron transport chain. c. Mitochondria takes in oxygen, oxygen re-bonds ADP into ATP. d. Water is released as a waste and ATP is formed.

12. What is the Krebs cycle? A cycle of chemical reactions that break down carbon-based molecules to transfer energy to the electron transport chain.

13. The prefix glycol- comes from a Greek word that means "sweet". The suffix ?lysis comes from a Greek word that means "to loosen". How are the meanings of these words parts related to the meaning of glycolysis? A sugar (sweet) is broken down (loosened) during glycolysis.

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