Concept 1:
Analyzing the Processes of Cellular Respiration.
Refer to pg 77-82 in Holtzclaw, Ch 9 in Campbell and media resources
Refer to pg 300-303 in Holtzclaw, Inv 6 in LabManual

Are these statements true or false?
1. Photosynthesis is the plant’s form of cellular
respiration.
2. Plants respire only when they don’t
photosynthesize.
3. Cellular respiration takes place only in plant
roots, not throughout the plant.

ALL OF THESE ARE FALSE!
1. Photosynthesis is the plant’s form of cellular
respiration. FALSE
2. Plants respire only when they don’t
photosynthesize. FALSE
3. Cellular respiration takes place only in plant
roots, not throughout the plant. FALSE

How is cellular metabolism relevant to higher levels of
biological organization: physiology (breathing, digestion),
ecology (communities)?

How is cellular metabolism relevant to higher levels of
biological organization: physiology (breathing, digestion),
ecology (communities)?

Cellular Respiration
 Catabolic
▪ Breaks down complex molecules into smaller ones
 Exergonic
▪ Releases energy that can be used to do work (such as
build ATP from ADP and Pi)

Cellular Respiration
 If you released all of the energy in sugar at once,
what would happen?
▪ Quick combustion! FIRE
▪ Example: Marshmellows on Fire

Cellular Respiration
 Instead, your mitochondria use a series of
controlled steps, releasing energy in small
amounts at a time
▪ Some energy still lost as heat
▪ The rest is converted to chemical energy in ATP for use
in the cell!
▪ HOW?????

Redox Reactions!
 Follows the movement of ELECTRONS from one
chemical to another
 “X” is losing electrons
 “Y” is gaining electrons

Redox Reactions!
 Lose Electrons, Oxidize
 Gain Electrons, Reduce

Redox Reactions!
 Classic Chemistry Example…

Redox Reactions!
 Cellular Respiration…
 Do you have any ideas as to how you can harness
the movement of electrons to split up cellular
respiration into steps??

Introducing…NAD+,
a coenzyme electron carrier

NAD+ + 2e - + H + produces NADH
 Is NAD+ reduced or oxidized?

Introducing…NAD+,
a coenzyme electron carrier

NAD+ + 2e - + H + produces NADH
 Gain Electrons Reduce

Also…FAD,
a coenzyme electron carrier

FAD + 2e - + 2H + produces FADH2
 Gain Electrons Reduce
The summary equation of cellular respiration.
The difference between fermentation and cellular
respiration.
 The role of glycolysis in oxidizing glucose to two
molecules of pyruvate
 The process that brings pyruvate from the cytosol
into the mitochondria and introduces it into the
citric acid cycle
 How the process of chemiosmosis utilizes the
electrons from NADH and FADH2 to produce ATP



Cellular respiration has three stages:
1. Glycolysis (breaks down glucose into two
molecules of pyruvate)
2. The citric acid cycle (completes the breakdown
of glucose)
3. Oxidative phosphorylation (accounts for most
of the ATP synthesis)
C6H12O6 + 6 O2  6 CO2 + 6 H2O + Energy (ATP + heat)
Where can you find all of these reactants/products?
 Bioflix!
 Comparison Chart – in three classes
You must know…
 The equation for cellular respiration.
 The components of a respirometer and how they interact
 The gas laws that affect volume changes within the
respirometer and cellular respiration
 The effect of temperature or increased metabolic activity
on respiration
 How to calculate the rate of respiration

Read lab manual
and p. 300-303 in Holtz

Do #1-6 p. S73 in manual
and #1-4 p. 303 in Holtz

Predict: What will respire more?
 Germinating peas or dry peas?
 @ 10°C or 25°C?