Active Lecture Questions for BIOLOGY, Eighth Edition Neil Campbell & Jane Reece Questions prepared by Jung Choi, Georgia Institute of Technology Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Chapter 9 Cellular Respiration: Harvesting Chemical Energy

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Electron Transport Chain and Respiration 1 Rotenone inhibits complex I (NADH dehydrogenase). When complex I is completely inhibited, cells will a)neither consume oxygen nor make ATP. b)not consume oxygen and will make ATP through glycolysis and fermentation. c)not consume oxygen and will make ATP only through substrate-level phosphorylation. d)consume less oxygen but still make some ATP through both glycolysis and respiration.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Glycolysis To sustain high rates of glycolysis under anaerobic conditions, cells require a)functioning mitochondria. b)oxygen. c)oxidative phosphorylation of ATP. d)NAD+. e)All of the above are correct.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Evolution of Metabolic Pathways Glycolysis is found in all domains of life and is therefore believed to be ancient in origin. What can be said about the origin of the citric acid cycle, the electron transport chain, and the F1 ATPase? a)They evolved after photosynthesis generated free oxygen. b)They evolved before photosynthesis and used electron acceptors other than oxygen. c)Individual enzymes were present before photosynthesis but served other functions, such as amino acid metabolism. d)They evolved when the ancestral eukaryotes acquired mitochondria.