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Homework:
 Due Tuesday: Finish the pre-lab questions on page 3.
 Answer any analysis questions that you can (but save graph for
class)
 Start PS 9

Do Now:
 Get a lab preview worksheet and answer #1-4

Goal for Today:
 Design and carry out an experiment to measure rates of
cell respiration

Homework:
 Work on PS 9 (due Friday)

Do Now: On an index card:
1. What is one thing you learned how to do in Excel yesterday
that you didn’t know before? Describe how to do this.
2. What is one question you still have about manipulating data in
Excel?
3. In what ways was the cold-temperature experiment yesterday
sloppy? How could it have been improved?

Goals: By the end of class you will be able to:
 Define oxidation and reduction and apply it to the
cell respiration chemical equation
 Describe the role of NADH and FADH2 in cell
respiration (and the role of all the molecules in the
chemical equation)
 Describe how the 3 stages of cell respiration
transfer energy and electrons from glucose in
order to make ATP
Cellular Respiration: An Overview
Overall purpose:
• Release energy from food in the form of ATP
for cells to use
Where it happens:
• In the mitochondria of all eukaryotic cells
• In aerobic bacteria
Summary equation:
C6H12O6 + 6O2  6CO2 + 6H2O + energy (ATP + heat)
glucose + oxygen  carbon dioxide + water + energy
Cell Respiration: A “Redox” Reaction
oxidation –
the loss of electrons
reduction –
the gain of electrons
e-
LEO says
GER
reduction
C6H12O6 + 6O2  6CO2 + 6H2O
oxidation
Important Molecules in
Cell Respiration
• Glucose – provides energy and electrons
• Oxygen – final electron acceptor
• Carbon dioxide – low-energy waste product
from glucose oxidation
• Water – low-energy waste product from
oxygen reduction
• NADH and FADH2 – intermediate electron
carriers
– Transfer electrons between stages of cell resp.
Cristae
Outer membrane
(folds in inner membrane)
Matrix
Inner membrane
Inter-membrane
space

Homework:
 Quiz tomorrow – you can bring one page (one side only) of
notes. Typed or hand-written, but on your own paper (not any
handout I’ve given you)
 PS 9 due Monday

Do Now: (in your mind or in your notebook)
1. What’s the difference between oxidation and reduction?
2. What do NADH and FADH2 do in cell respiration?
3. What do you think “glycolysis” means?

Goals: By the end of class you will be able to:
 Describe how the 3 stages of cell respiration
transfer energy and electrons from glucose in
order to make ATP
 Explain how cell respiration can happen in the
absence of glucose, and in the absence of oxygen
Glycolysis:
splitting glucose
P
glucose
(6 carbons)
2 pyruvate
(3 carbons each)
P
to ETS
Citric Acid Cycle (aka Krebs cycle)
intermediate
step
Oxidative Phosphorylation
(ETS and Chemiosmosis)
ee-
e-
e-

Then do the first side of the worksheet
Cell Respiration without oxygen:
Anaerobic Respiration (Fermentation)
Cell Respiration without oxygen:
Anaerobic Respiration (Fermentation)
Two Types of Fermentation:
both regenerate NAD+ so that glycolysis can continue
ALCOHOL FERMENTATION
• in yeast cells and some bacteria
• produces ethyl alcohol and CO2
LACTIC ACID FERMENTATION
• in vertebrate muscle cells and some bacteria
• produces lactic acid

Homework:
 Problem Set 9 due Monday

Do Now:
How do you think cell respiration can happen if a cell runs out of
glucose?

Today’s Agenda:
 Cell Respiration Wrap-Up
 Quiz
Cell Respiration
without glucose!
Total ATP Production
Total ATP Production

Work on your own for 20 minutes
 Use your 1 page of notes

Partner Check-in for last 10 minutes
 Confer with an assigned partner to discuss/check
your answers
 You may not use your notes for this part
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Adel / Imad
Talia / Fatima
Christina / Djinnie
Drishti / Klara
Poppy / Rishab
Nehemie / Kiraleah
Kimberly / Nicole
Jasmine / Aaron