Transcript 09_Active_Lecture_Questions 2

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