Name________________________________Class____________________Date____________________

Section 4: Overview of Cellular Respiration

Study Guide KEY CONCEPTThe overall process of cellular respiration converts sugar into ATP using oxygen.

VOCABULARY

cellular respiration anaerobic

aerobic Krebs cycle

glycolysis

MAIN IDEA: CELLULAR RESPIRATION MAKES ATP BY BREAKING DOWN SUGARS.Circle the word or phrase that best completes the statement.

1. Cellular respiration is a process that releases glucose / energy from sugars and other carbon-based molecules to make ATP when oxygen / carbon dioxide is present.

2. Cellular respiration is called an aerobic process, because it needs oxygen / carbon dioxide to take place.

3. Cellular respiration takes place in the chloroplasts / mitochondria.

4. During glycolysis, one molecule of glucose / protein is split into two three-carbon molecules and two ADP / ATP are formed.

MAIN IDEA: CELLULAR RESPIRATION MAKES ATP BY BREAKING DOWN SUGARS.

5. Circle the two ways in which cellular respiration seems to be the opposite of photosynthesis.a. The reactions occur at either end of the chloroplast.b. The overall chemical equations are the reverse of each other.c. Cellular respiration breaks down sugars to make ATP, and photosynthesis

uses ATP to make sugars.d. Cellular respiration produces oxygen, and photosynthesis produces carbon

dioxide.

6. Circle the two parts of a mitochondrion where cellular respiration takes place.a. matrixb stromac. inner mitochondrial membrane

Name________________________________Class____________________Date____________________d. outer mitochondrial membrane

7. The overall process of cellular respiration can be written as a chemical equation. Fill in the blanks in the equation below using the appropriate compound from the box.6O2 6CO2 6H2O C6H12O6

__________ + __________ ________ + ________

8. The two reactants in the cellular respiration equation are ________ and _________.

9. The two products in the cellular respiration equation are ________ and _________.

10. Why is the cellular respiration equation written with several arrows?a. Because a series of products result from the reaction.b. Because a series of reactants enter into the reaction.c. Because a series of chemicals is added to the process.d. Because a series of chemical reactions occurs.

11. Use the space below to sketch a mitochondrion. Label the matrix and inner membrane. Indicate where each of the following steps of the cellular respiration process occurs.a. Energized electrons are passed along the electron transport chain in the inner

mitochondrial membrane. b. Energy is transferred to the second stage of cellular respiration (the electron

transport chain).c. A large number of ATP are formed. Oxygen picks up electrons, and water is

released as a waste product.d. Three-carbon molecules enter the Krebs cycle and are broken down. ATP and

other energy-carrying molecules are formed. Carbon dioxide is released as a waste product. Cellular RespirationCellular Respiration

Study Guide A continued

Vocabulary CheckFill in the blank with the word or phrase that best completes the sentence.

12. The prefix glyco- comes from a Greek word that means “sweet.” The suffix -lysis comes from a Greek word that means “to loosen.” Therefore, during glycolysis, a _________ is broken down (or “loosened”).

13. Glycolysis is an anaerobic process, because it takes place without __________________.

14. During the Krebs cycle, chemical reactions _____________________ carbon-based molecules.

Study Guide KEY CONCEPTCellular respiration is an aerobic process with two main stages.

MAIN IDEA: GLYCOLYSIS IS NEEDED FOR CELLULAR RESPIRATION.

1. The function of glycolysis is to split _______________ and produce energy-carrying molecules.

2. Three molecules are formed during glycolysis when oxygen is available. ____________ and _________ are used in cellular respiration. ____________ can be used for cell processes.

3. Glycolysis results in a “net gain of two ATP molecules.” This means that _______ ATP are used to split glucose and _________ ATP are produced. Therefore, in the end, there are two additional ATP.

MAIN IDEA: THE KREBS CYCLE IS THE FIRST MAIN PART OF CELLULAR RESPIRATION.

4. What is the function of the Krebs cycle?a. To produce carbon-based molecules by cellular respiration.b. To produce carbon-based molecules by glycolysis.c. To produce energy-carriers from the breakdown of carbon-based molecules.d. To produce energy-carriers from the synthesis of carbon-based molecules.

5. Put the letter from each of the following statements into the appropriate box of the cycle diagram below to summarize the six steps of the Krebs cycle. a. Citric acid broken down, carbon dioxide released, NADH produced.b. Citric acid formed.c. Coenzyme A binds to two-carbon molecule; enters Krebs cycle.d. Five-carbon molecule broken down, carbon dioxide released, NADH and ATP

produced.e. Four-carbon molecule rearranged, NADH and FADH2 produced.

THE ELECTRON TRANSPORT CHAIN IS THE SECOND MAIN PART OF CELLULAR RESPIRATION.

Circle the word or phrase that best completes the statement.

6. The electron transport chain in cellular respiration is located on the inner / outer mitochondrial membrane.

7. The electron transport chain uses energy from electrons / protons to pump oxygen ions / hydrogen ions across the membrane, so that the ions can flow back through ATP synthase to produce ATP.

Pyruvate broken down