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© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Photosynthesis and
Respiration
Chapter 8 Lecture Outline
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Class Policies Attendance:
Attend both lab and lecture regularly and on time. You CANNOT make up labs. If you miss a lab, you should read the lab manual
carefully and make sure you understand the lab. If you miss more than two labs, you may be dropped from the course If you miss more than two lectures, you may be dropped from the course (this includes
sleeping in class) Academic Integrity: the highest standards of academic integrity are expected
Students must do their own work on homework assignments, tests, quizzes, and laboratory write-ups.
If academic dishonesty occurs, you will receive a zero for that assignment and you may be dropped from the course with an F.
Make-up exams: I will not allow make-up exams except for in EXTREME circumstances. All make-up
exams will consist primarily of essay questions. It is NOT POSSIBLE to make-up a Lab Practical. You will receive a zero for that grade
Cell phones: Please turn phones off during class.
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Grade Points
Assignment Points
Lecture Exams (100 points each) 400 Lab Exams (100 points each) 300 Lab Reports (5 points each) 50 Project Presentation 100 Total 850
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Respiration
Getting energy from food
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Energy Carrier Molecules
Temporarily store and transfer energy ATP stores energy in phosphate bonds
Transfers this energy with phosphate
Phosphorylation
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Hydrogen – proton and electron
Proton – positively charged (+)
Electron – negatively charged (-)
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Other Energy Carriers
NADP+ and NAD+
Pick up electrons and become reduced NADPH and NADH
Donate these electrons and energy
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Mitochondrion: Aerobic Respiration Citric acid cycle & oxidative phosphorylation Electron Transport Chain (ETC) Mitochondrial Matrix
ETC
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Gaining Energy from Sugar
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Catabolic Reactions – breaking down molecules, capturing energy
Aerobic metabolism: three steps Glycolysis, Citric Acid Cycle, Oxidative Phosphorylation
Releases the most energy
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Glycolysis Glucose is split into 2 molecules of pyruvate 2 ATP and 3 NADH are made
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Glucose is split
Count the Carbon atoms 6 Carbons in Glucose 3 Carbons in Pyruvate
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Catabolic Reactions - More
Anaerobic metabolism: two steps Glycolysis & Fermentation Releases much less energy
Does NOT use Oxygen Does not use the Citric Acid Cycle Does not use mitochondria
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Fermentation – Does NOT use oxygen Anaerobic Respiration
Energy production in the absence of O2
In yeast and bacteria, CO2 is formed Ethyl alcohol is a byproduct
In animals, lactic acid is the byproduct
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Anaerobic Respiration
Used in making beer, bread
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Anaerobic Respiration – more
Used in making yogurt, kefir
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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The Citric Acid Cycle
Pyruvate broken down to release CO2
Acetyl CoA added to OAA to form citrate
3 NADH and 1 ATP are made
NADH passed to the ETC
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Ox/Phos Electrons passed
from NADH to ETC ETC produces H+
gradient O2 accepts electrons
and becomes 2 H2O ATP synthase makes
ATP from H+ gradient
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Websites
http://vcell.ndsu.nodak.edu/animations/atp
gradient/movie.htm
http://vcell.ndsu.nodak.edu/animations/etc/movie.htm
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Stop Here
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Capturing Energy Sun is primary source of energy Energy flows through life systems
Producers
Primary consumers
Secondary
consumers
Photosynthesis
Sugars out
O2 out
Respiration
CO2 and H2O out
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Structure of the Chloroplast Double membrane – intermembrane space Stroma Thylacoid disks - Thylacoid space
Stroma
Inner membrane
Outermembrane
Granum (stack of thylacoids)
ChloroplastThylacoid disk
Stroma
Thylacoid membrane Thylacoid spaceIntermembrane space
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Light and Dark Reactions Light reactions capture light energy
Take place in thylacoids Use chlorophyll Charge energy transfer molecules & make O2
Dark reactions make sugars Occur in the stoma Use the energy from transfer molecules Produce glucose
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Light Reactions Chlorophyll antennae capture energy from
light Pass it to Photosystems I and II (ETCs)
Chlorophyllmolecules
Reactioncenters
Photosystem II Photosystem I
Thylacoid space
Thylacoid membrane
Antennacomplex
Stroma
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Photosystem II Electrons stripped from
H2O Energized by light &
passed H+ remains inside
thylacoid space Energy used to pump H+
into thylacoid More H+ accumulates in
thylacoid space
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.1bPhotosynthesis: Overview of Reactions
Macintosh
Windows
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Electron Transport ChainPhotosystem I (look familiar?)
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Photosystem I
Electrons passed to photosystem I
Light used to recharge electrons
This energy used to make NADPH
Making NADPH decreases H+ outside
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.1cPhotosynthesis: The Light Reactions
Macintosh
Windows
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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ATP Synthase
H+ gradient represents stored energy
Used by ATP synthase
H+ released to phosphorylate ADP
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Dark Reactions: Carbon Fixation Rubisco catalyzes CO2 fixation to ribulose
Begins the carbon fixation cycleRubisco
CARBON FIXATION
Glucose
Unstable 6CCompound
Ribulose1,5 bisphosphate Glyceraldehyde
3-phosphate
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.1dPhotosynthesis: Carbon Fixation Reactions
Macintosh
Windows
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Three turns of cycle produce a 3C sugar:
glyceraldehyde 3-phosphate Most is used by mitochondrion: energy Two can be combined to give 6C: Glucose Can be stored or used for structure
Dark Reactions: Carbon Fixation
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Photosynthesis and Aerobic Respiration An exchange of molecules and energy
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Similarities between respiration and photosynthesis
Electron TransportChemiosmosisPhosphorylation
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Similarities between respiration and photosynthesis
ELECTRON TRANSPORT Aerobic respiration Glucose is oxidized (Lose Electrons Oxidation) Electrons are passed to the electron transport chain in
the inner mitochondrial membrane.Photosynthesis Chlorophyll a is oxidized by light (photo-oxidized),
(Lose Electrons Oxidation) Electrons are passed to the electron transport chain in
the thylakoid membrane.
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Electron transport Chain
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Similarities between respiration and photosynthesis CHEMIOSMOSIS the energy released by the
electrons as they pass through the electron transport chain is used to create a proton gradient across a membrane Across the inner mitochondrial membrane into the
intermembrane space in mitochondria, Across the thylacoid membrane into the thylacoid
lumen in chloroplasts. Both are impermeable to hydrogen ions. Diffusion
occurs only via specific transport proteins.
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Proton gradient – chemiosmosis and Oxidative Phosphorylation Generates Proton
gradient Provides energy for
ADP—>ATP Occurs in:
Respiration Photosynthesis
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Similarities between respiration and photosynthesis PHOSPHORYLATION
Both the inner mitochondrial membrane and the thylacoid membrane are impermeable to hydrogen ions. Diffusion occurs only via specific transport proteins.
Transport protein is an enzyme called ATP synthase. As the hydrogen ions (protons) diffuse through ATP synthase, ATP is produced from ADP and inorganic phosphate.
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Laboratory Preparation
Experiment 8C Paper ChromatographyExamine various photosynthetic pigments
Measure PhotosynthesisObserve O2 production
Design an Experiment for next class
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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ELECTROMAGNETIC SPECTRUM
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Visible Spectrum
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Concept Quiz
A common feature of both chloroplasts and mitochondria is
A. The use of chlorophyll
B. Production of CO2
C. Use of an Electron Transport Chain
D. Presence in all cells
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Photosystem II differs from photosystem I in that it produces
A. NADPH
B. O2
C. A proton gradient
D. ATP
Concept Quiz
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Concept Quiz
Most of the ATP produced by aerobic respiration comes from
A. Glycolysis
B. The citric acid cycle
C. Oxidative phosphorylation
D. Fermentation
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.1aPhotosynthesis: The Flow of Energy
Macintosh
Windows
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.2aCatabolism: Glycolysis
Macintosh
Windows
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.2bCatabolism: The Citric Acid Cycle
Macintosh
Windows
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.2cCatabolism: Oxidative Phosphorylation
Macintosh
Windows
© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e
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Process Animation 8.2dCatabolism: Aerobic vs. Anaerobic Respiration
Macintosh
Windows
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