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Transcript
Cellular Respiration (8.3)
State Standard
SB3A. Explain the cycling of energy through
the processes of photosynthesis and
respiration.
Chapter 8
Cellular Energy
8.3 Cellular Respiration
Overview
 Organisms obtain energy in a process called
cellular respiration.
 The equation for cellular respiration is the
opposite of the equation for photosynthesis.
 Label the reactants & products below.
Chapter 8
Cellular Energy
8.3 Cellular Respiration
Overview Cont’d
 Cellular respiration occurs in 3 parts.
 Glycolysis
 Krebs Cycle
 Electron Transport Chain
(Together, the KC & ETC make up
Aerobic Respiration)
Chapter 8
Cellular Energy
8.3 Cellular Respiration
Glycolysis
 Takes place in the cytoplasm
 Glucose is broken down
 Anaerobic (without oxygen)
 Glucose enters the cell by active transport
 Enzymes break it down into pyruvate
 Net result = 2 ATP
 Precedes aerobic
respiration
Chapter 8
Cellular Energy
8.3 Cellular Respiration
Aerobic Respiration: Krebs Cycle
Purpose: Breaks down the pyruvate from
glycolysis to produce molecules used in the
electron transport chain.
Location: Mitochondria
Products: 6 CO2
2 ATP
8 NADH
2 FADH2
Chapter 8
Cellular Energy
8.3 Cellular Respiration
Aerobic Respiration: Krebs Cycle
Cont’d
• What happens to the products?
6 CO2 – gets released (by-product)
2 ATP – used for energy-requiring processes
8 NADH & 2 FADH2 – move on to help
generate ATP in the next step
Chapter 8
Cellular Energy
8.3 Cellular Respiration
AR: Krebs Cycle
Cont’d
• Circle the parts of the
diagram that help
you recognize it
as Krebs Cycle.
Chapter 8
Cellular Energy
8.3 Cellular Respiration
AR: Electron Transport Chain (ETC)
• Final step in the breakdown of glucose
Purpose: Converts ADP to ATP by transferring
electrons
Location: Mitochondria
Products: ATP (34)
CO2
H 2O
Chapter 8
Cellular Energy
8.3 Cellular Respiration
Anaerobic Respiration
 AKA fermentation
 The anaerobic
pathway that follows
glycolysis
 Occurs in the
cytoplasm
 Generates small
amounts of ATP
Chapter 8
Cellular Energy
8.3 Cellular Respiration
Anaerobic Respiration Cont’d
 2 main types
 Lactic acid fermentation
-muscles cells
-microorganisms used to produce foods
such as cheese, yogurt, & sour cream
 Alcohol fermentation
-yeast
-some bacteria
Chapter 8
Cellular Energy
Chapter Diagnostic
Questions
In which metabolic process are molecules
broken down to produce carbon dioxide and
water?
A. photosynthesis
B. cellular respiration
C. homeostasis
D. fermentation
1.
2.
3.
4.
0%
A
0%
B
A
B
C
D
0%
C
0%
D
Chapter 8
Cellular Energy
8.1 Formative
Questions
Why is cellular respiration a catabolic pathway?
1.
2.
3.
4.
0%
C
0%
B
A
0%
A
B
C
D
0%
D
A. Energy is used to form
glucose and oxygen.
B. Energy is converted from
water to carbon dioxide.
C. Energy that is lost is
converted to thermal energy.
D. Energy is released by the
breakdown of molecules.
Chapter 8
Cellular Energy
8.3 Formative
Questions
What is the overall purpose of cellular
respiration?
1.
2.
3.
4.
0%
C
0%
B
A
0%
A
B
C
D
0%
D
A. to make ATP
B. to process H2O
C. to store glucose
D. to deliver oxygen
Chapter 8
Cellular Energy
8.3 Formative
Questions
A
B
C
D
0%
C
B
A
1.
2.
3.
4.
0%
D
Which represents the general sequence of
cellular respiration?
A. TCA cycle 
chemiosmosis  glycolysis
B. glycolysis  Krebs
cycle  electron transport
C. electron absorption 
catalysis  phosphorylation
D. aerobic pathway 
anaerobic pathway 
0%
0%
fermentation
Chapter 8
Cellular Energy
8.3 Formative
Questions
Which stage of cellular respiration is the
anaerobic process?
1.
2.
3.
0%
B
A
0%
A
B
C
0%
C
A. glycolysis
B. Krebs cycle
C. electron transport
Chapter 8
Cellular Energy
8.3 Formative
Questions
Which molecule
generated by the Krebs
cycle is a waste product?
1.
2.
3.
4.
0%
C
0%
B
A
0%
A
B
C
D
0%
D
A. CoA
B. CO2
C. FADH2
D. NADH
Chapter 8
Cellular Energy
Chapter Assessment
Questions
During the Krebs cycle,
pyruvate is broken down
into what compound?
A. H2O
B. O2
C. CO
D. CO2
1.
2.
3.
4.
0%
D
0%
C
0%
B
A
0%
A
B
C
D
Chapter 8
Cellular Energy
Standardized Test
Practice
What prevents pyruvate from
entering the Krebs cycle and
instead results in this pathway?
A. a buildup of CO2
B. a lack of oxygen
C. an excess of
glucose
1.
2.
3.
4.
0%
0%
D
0%
C
A
0%
B
D. an increased
demand for ATP
A
B
C
D