Chapter 9 SR Answer Key
Section Review 9-1
1. cellular respiration 2. glucose 3. NADH
4. two 5. alcohol, CO2, NAD_ 6. The process
of fermentation does not require oxygen.
7. Fermentation continues to produce NAD_
without oxygen. This process allows glycolysis to
continue to produce ATP. 8. glucose 9. 2 NADH
10. 2 pyruvic acid
Section Review 9-2
1. Pyruvic acid is the product of glycolysis and
becomes one of the reactants in the Krebs cycle. It is
broken down into carbon dioxide to produce ATP.
2. Glycolysis is the first step in cellular respiration.
The pyruvic acid produced during glycolysis is broken
down in the presence of oxygen during the Krebs
cycle. 3. High-energy electrons from the Krebs cycle
and glycolysis are used to convert ADP to ATP in the
electron transport chain. 4. The reactants in cellular
respiration are glucose and oxygen. The products of
cellular respiration are carbon dioxide, water, and
energy. 5. photosynthesis 6. photosynthesis 7. cellular
respiration 8. cellular respiration 9. Only 2
ATP are obtained from glycolysis, while a total of 36
ATP are obtained from cellular respiration. 10. The
baseball player would probably use lactic acid fermentation,
and the cross-country skier would use cellular
respiration. The baseball player would need
quick energy and an ATP supply for only a few seconds.
The cross-country skier would need to generate
a continuing supply of ATP for a longer period of
time.
Chapter Vocabulary Review
1. A calorie is the amount of energy needed to
raise the temperature of 1 gram of water 1 Celsius
degree. 2. Glycolysis is the process in which one
molecule of glucose is broken in half, producing two
molecules of pyruvic acid, a 3-carbon compound.
3. Cellular respiration is the process that releases
energy by breaking down glucose and other food
molecules in the presence of oxygen. 4. NAD_ is an
electron carrier that helps pass energy from glucose
to other pathways in the cell during glycolysis. 5.
Fermentation is the process that releases energy from
food molecules by producing ATP in the absence of
oxygen. 6. Anaerobic means “not in air.” 7. Aerobic
means “in air.” 8. The Krebs cycle is the process in
which pyruvic acid is broken down into carbon dioxide
in a series of energy-extracting reactions. 9. The
electron transport chain uses the high-energy electrons
from the Krebs cycle to convert ADP to ATP.
10. alcoholic fermentation 11. lactic acid fermentation
12. cellular respiration 13. glycolysis 14. cellular
respiration 15. lactic acid fermentation 16. b
17. d 18. c 19. glycolysis 20. Krebs cycle
Graphic Organizer
1. Quick production of ATP and NADH for cellular
energy 2. Release of energy without oxygen 3. Longterm, slow production of ATP for cellular energy
4. Glucose, ATP 5. Pyruvic acid, NADH 6. ATP,
NADH, pyruvic acid 7. CO2, H2O, energy 8. Can
release energy without oxygen 9. Sustains energy
production much longer than glycolysis and fermentation 10. Quickly fills all available NAD_ molecules with electrons and the process stops 11. Much slower than glycolysis and fermentation