WARM UP 11/5

What part of photosynthesis happens across
the thylokoid membrane?
 What
are the two steps of the light reaction?
 These
have scientific names!
 What
is the final product in chemiosmosis?
 What enzyme helps make ATP?

In photosynthesis where does the oxygen come
from (What molecule)?
Notes 7: Aerobic Pathways
CHAPTER 7: CELLULAR RESPIRATION
NOTES 24: AEROBIC & ANAEROBIC PATHWAYS
Aerobic vs. Anaerobic Pathways
Two pathways exist for accessing stored energy…
Aerobic
Pathways
take place in
the presence
of oxygen
Anaerobic
Pathways
take place in
the absence
of oxygen
Both pathways:
1) Begin with Glycolysis
2) Produce a Pyruvic Acid Intermediate
3) Differ in ATP production and final product
NOTES 24: AEROBIC & ANAEROBIC PATHWAYS
The Mitochondria
● Glycolysis occurs in the
cytosol whether prokaryote or
eukaryote
●In prokaryotes, Aerobic
Respiration will take place in the
cytosol
● In eukaryotes, Aerobic
Respiration will take place in the
mitochondria
● Mitochondrial Matrix = the area inside
the cristae that contains the enzymes
needed for the Krebs cycle
● Cristae = the folds of the inner
membrane of the mitochondria that
contains the electron transport chain.
NOTES 24: AEROBIC & ANAEROBIC PATHWAYS
Glycolysis
● Glycolysis = a biochemical
pathway in which a 6 carbon
molecule of glucose is cut into two
three-carbon molecules of pyruvic
acid.
● Produces a net yield of 2 ATP
molecules per glucose
● The pyruvic acid will either enter
an anaerobic or aerobic pathway
for further processing.
WARM UP 11/6

Where does Glycolysis happen in prokaryotes?
 In

Where does Aerobic respiration (after
glycolysis) happen in prokaryotes?
 In

eukaryotes?
eukaryotes?
Make a double bubble comparing and
contrasting Aerobic and Anaerobic Pathways.
 Minimum
3 similarities and 2 differences each.
AEROBIC RESPIRATION PATHWAY
NOTES 24: AEROBIC & ANAEROBIC PATHWAYS
Aerobic vs. Anaerobic Pathways
Two pathways exist for accessing stored energy…
Aerobic
Pathways
take place in
the presence
of oxygen
Anaerobic
Pathways
take place in
the absence
of oxygen
Both pathways:
1) Begin with Glycolysis
2) Produce a Pyruvic Acid Intermediate
3) Differ in ATP production and final product
NOTES 24: AEROBIC & ANAEROBIC PATHWAYS
The Mitochondria
● Mitochondrial Matrix = the area inside
the cristae that contains the enzymes
needed for the Krebs cycle
● Cristae = the folds of the inner
membrane of the mitochondria that
contains the electron transport chain.
NOTES 24: AEROBIC & ANAEROBIC PATHWAYS
Glycolysis
● Glycolysis = a biochemical
pathway in which a 6 carbon
molecule of glucose is cut into two
three-carbon molecules of pyruvic
acid.
● Produces a net yield of 2 ATP
and 2 NADH molecules per
glucose
● The pyruvic acid will either enter
an anaerobic or aerobic pathway
for further processing.
NOTES 25: THE AEROBIC PATHWAY
Aerobic Respiration Part 1: The Krebs Cycle
● Pyruvic acid enters
from glycolysis
● Eukaryotes = occurs
in the Mitochondrial
Matrix
● Prokaryotes = occurs
in the cytosol
The pathway produces:
2 CO2 per pyruvate
3 NADH (an energy carrying molecule)
1 FADH2 (an energy carrying molecule)
1 ATP
NOTES 25: THE AEROBIC PATHWAY
Aerobic Respiration Part 2: The Electron
Transport Chain & Chemiosmosis
● Eukaryotes = the electron
transport chain and the enzyme
ATP synthase are embedded in
the cristae.
●Prokaryotes = the electron
transport chain and the enzyme
ATP synthase are embedded in
the cell membrane.
● Oxygen is the final electron acceptor. If
it is not available then chain is stopped. By
accepting the electrons and protons Water
is produced.
● Chemiosmosis produces ATP through
the proton concentration gradient
NOTES 25: THE AEROBIC PATHWAY
Total Energy Production:
4 ATP are made directly
34 ATP are made through
NADH/FADH2 going through
chemiosmosis
38 ATP Made In Total
- 2 ATP for transporting NADH
into the Mitochondria from
Glycolysis
36 Net ATP Made by
Eukaryotes
Aerobic Respiration is 20
times more efficient than
Glycolysis alone.
NOTES 25: THE AEROBIC PATHWAY
Homework
Fact: Our bodies use ATP at the rate of about 1 million
molecules per cell per second.
There are more than 100 trillion cells in the human body.
That’s about 100,000,000,000,000,000,000 ATP
molecules used in your body each second!
Read 131-143
Answer questions 1-6 on p.144