Chapter 9: Cellular Respiration: Harvesting Chemical Energy
 
Pre-Test
 

Pre-Test


1 .       Which of the following best describes the main purpose of the combined processes of glycolysis and cellular respiration? (Concept 9.1E-Book) [Hint]

 the breakdown of glucose to carbon dioxide and water
 conserving the energy in glucose and related molecules in a chemical form that cells can use for work
 catabolism of sugars and related compounds
 producing complex molecules from chemical building blocks
 breaking down ATP, so that ADP and P can be reused


2 .       In the combined processes of glycolysis and cellular respiration, what is consumed and what is produced? (Concept 9.1E-Book) [Hint]

 Carbon dioxide is consumed, and water is produced.
 Oxygen is consumed, and glucose is produced.
 Water is consumed, and ATP is produced.
 Glucose is consumed, and carbon dioxide is produced.
 ATP is consumed, and oxygen is produced.


3 .       Which of the following describes the process of glycolysis? (Concept 9.2E-Book) [Hint]

 It represents the first steps in the chemical oxidation of glucose by the cell.
 It produces both ATP and NADH.
 It converts one glucose molecule to two molecules of pyruvate and carbon dioxide.
 The first two answers are correct.
 The first three answers are correct.


4 .       A glucose molecule is completely broken down to carbon dioxide and water in glycolysis and the citric acid cycle, but together these two processes yield only a few molecules of ATP. What happened to most of the energy that the cell obtains from the oxidation of glucose? (Concept 9.3E-Book) [Hint]

 It is stored in pyruvate.
 It is stored in the carbon dioxide and water molecules released by these processes.
 It was lost as heat.
 It is stored in NADH.
 It is stored in the ATP that was formed by glycolysis and the citric acid cycle.


5 .       The electrons stripped from glucose in cellular respiration end up in which compound? (Concept 9.4E-Book) [Hint]

 ATP
 NADH
 oxygen
 carbon dioxide
 water


6 .       Which of the following statements about the redox reactions of the electron transport chain is correct? (Concept 9.4E-Book) [Hint]

 The oxidation of NADH is directly coupled to the reduction of oxygen to water.
 The redox reactions of the electron transport chain are directly coupled to the movement of protons across a membrane.
 The redox reactions of the electron transport chain are directly coupled with the synthesis of ATP.
 NADH gains electrons in the initial reaction of the electron transport chain.
 The proteins of the electron transport chain provide an environment in which electrons from a molecule being oxidized can be passed directly to a molecule that is being reduced.


7 .       Which statement about the citric acid cycle is incorrect? (Concept 9.3E-Book) [Hint]

 The citric acid cycle oxidizes the products of glycolysis to carbon dioxide.
 The citric acid cycle produces most of the NADH that is subsequently used by the electron transport chain.
 The oxidation of compounds by the citric acid cycle requires molecular oxygen.
 The last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle.
 The citric acid cycle depends on the availability of NAD+, which is a product of the electron transport chain.


8 .       In the absence of oxygen, what is the net gain of ATP for each glucose molecule that enters glycolysis? (Concept 9.5E-Book) [Hint]

 38 ATP
 4 ATP
 2 ATP
 none, because in the absence of oxygen, no ATP can be made
 none, because all of the available energy remains in either lactate or ethanol


9 .       Which of the following statements is correct about the chemiosmotic synthesis of ATP? (Concept 9.4E-Book) [Hint]

 The energy for production of ATP from ADP comes directly from a gradient of electrons across the inner mitochondrial membrane.
 Oxygen participates directly in the reaction that makes ATP from ADP and P.
 The chemiosmotic synthesis of ATP requires that the electron transport in the inner mitochondrial membrane be coupled to proton transport across the same membrane.
 The first two choices are correct.
 The first three choices are correct.


10 .       In most cells, not all of the carbon that enters glycolysis is converted to carbon dioxide by cellular respiration. What happens to this carbon that does not end up as CO2? (Concept 9.6E-Book) [Hint]

 It is used to convert ADP to ATP via chemiosmosis.
 It is converted to heat.
 The carbon atoms are removed from these processes to serve as building blocks for other complex molecules.
 It is used to make ATP.
 It is used to make NADH.







©2005 Pearson Education, Inc., publishing as Benjamin Cummings