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Bell work
• Clear your desk in preparation for
a photosynthesis quiz.
Questions
• What do you know about cellular
respiration?
• What do you know about how it
relates to photosynthesis?
Ch 7 Cellular Respiration
Explain cellular respiration and its three stages:
glycolysis, Kreb’s cycle and electron transport chain.
Know where each stage of cellular respiration takes
place.
Write the chemical equation for cellular respiration and
identify the reactants and products.
Distinguish between aerobic and anaerobic
respiration.
Describe the two main types of fermentation?
Cellular Respiration
• process that releases energy by breaking
down food molecules
• Aerobic respiration
• requires oxygen
• takes place in the mitochondria
• converts sugar and oxygen into carbon
dioxide, water, and energy [ATP]
• three sets of chemical reactions
– glycolysis
– Kreb’s cycle
– electron transport chain
• Answer the following question
•
A student sets up a sealed ecosystem containing a snail (a
consumer) and an elodea (a producer). The balance of gases in
the ecosystem remains stable over a period of several days. The
student concludes that the gas output of the snail equals the gas
intake of the elodea and that the gas input of the snail equals the
gas output of the elodea. Which finding would suggest that the
student’s conclusion must be re-evaluated due to another
consumer accidentally being included in the ecosystem?
A) Oxygen content of air in the ecosystem rises when the snail is
removed.
B) Oxygen content of air in the ecosystem falls when the elodea is
removed.
C) Carbon dioxide content of air in the ecosystem shows little change
when the snail is removed.
D) Carbon dioxide content of air in the ecosystem shows little change
when the elodea is removed.
Chemical Equation
C6H12O6 + O2

CO2 + H2O + ATP
glucose + oxygen yields carbon dioxide + water + energy
Glycolysis
• process in which one molecule of glucose is
broken in half, producing two molecules of
pyruvic acid
• takes place in cytosol of cytoplasm
• does not require oxygen
• converts glucose, ADP, and NAD+
• to pyruvic acid, ATP, and NADH
• net production of ATP: 2 ATP
Glycolysis.mov
Kreb’s Cycle
• second stage of cellular respiration, in
which pyruvic acid is broken down into
carbon dioxide in a series of energyextracting reactions
• takes place in matrix of mitochondrion
• converts pyruvic acid, NAD+, FAD+, and
ADP
• to CO2, NADH, FADH2, ATP
• net production of ATP: 2 ATP
Electron Transport Chain
• high-energy electrons from the
Krebs cycle are used to convert ADP
into ATP
• takes place at inner membrane of the
mitochondrion
• converts O2, NADH, FADH2 and ADP
• to H2O, NAD+, FAD+, ATP
• net production of ATP: 32 ATP
Electron Transport Chain
• Glycolysis
Cellular Respiration
– 2 ATP
• Kreb’s Cycle
– 2 ATP
• Electron Transport Chain
– 32 ATP
Total: 36 ATP
Review and Extend
Standards
●
●
SPI 3210.3.3 Compare and contrast
photosynthesis and cellular respiration in
terms of energy transformation.
SPI 3210.3.2 Distinguish between aerobic
and anaerobic respiration.
Find a Partner
Overview of Aerobic Respiration
●
Two Main Parts:
●
●
Krebs Cycle (citric acid cycle) – uses pyruvate
Electron Transport Chain – uses NADH
With your partner
Draw a mitochondria and label the parts.
Mitochondria
Cristae:
Folds of the inner
membrane where
the ETC takes place.
Matrix:
Fluid inside the inner membrane that
contains many enzymes that facilitate the
Krebs cycle.
Aerobic Respiration - Step 1
Pyruvate/ Pyruvic Acid
Diffuses into the
mitochondrial matrix
where it becomes
Acetyl CoA.
Products:
NADH for ETC
CO2 diffuses out of
cell
With your partner:
Dogs - summarize Step 1 for your partner.
Step 2 : Citric Acid Cycle (Krebs)
Acetyl CoA moves into the citric acid cycle and
produces NADH and FADH2 for the ETC.
With your partner:
Horses - Summarize the Krebs Cycle for
your partner.
Step 3 - Electron Transport Chain (ETC)
NADH, FADH, & Oxygen are used to create a
concentration gradient that makes ATP and
water.
Overview
With your Partner
Using these
products and
reactants create a
chemical equation
for cell respiration:
Glucose, oxygen ,
carbon dioxide , ATP,
water
●
Anaerobic
Respiration
Overview of Cell Respiration
Glucose
Aerobic Respiration
36 ATP
Glycolysis
2 ATP
Pyruvate
Fermentation
Latic Acid
Alcohol
Glycolysis
●
Reactants:
Glucose, 2 ATP, NAD+
●
Products:
Pyruvate – moves to Kreb Cycle
H2O – becomes part of
cytoplasm
4 ATP – used by cell
NADH – moves to
electron transport chain
Pyruvate quickly becomes
Pyruvic Acid!!
Pause & Think
●
Determine what all of these might have in
common.
Fermentation
●
Two types of fermentation:
●
Lactic Acid fermentation:
Performed by human muscle cells and some
microorganisms to turn pyruvic acid into lactic
acid - used to make cheeses, yogurt, sour cream.
●
Alcohol fermentation:
Performed by some microorganisms to turn
pyruvic acid into alcohol – used to make
intoxicating beverages.
Anaerobic Respiration
• process by which cells release energy in the
absence of oxygen
• also known as fermentation
• begins with Glycolysis
• Two types of fermentation
– lactic acid fermentation
• animal muscles
• pyruvic acid + NADH  lactic acid + NAD+
– alcoholic fermentation
• Yeasts and a few other microorganisms
• forms ethyl alcohol and carbon dioxide as wastes.
• pyruvic acid + NADH  alcohol + CO2 + NAD+
Aerobic Respiration
Anaerobic Respiration
Cellular respiration
Fermentation
requires O2
no O2 required
36 ATP
2 ATP
Glycolysis
Kreb’s Cycle
Electron Transport
Chain
Glycolysis
Lactic acid fermentation
or
Alcoholic fermentation