today: photosynthesis and respiration photosynthesis and respiration lunch lunch quiz 5 quiz 5
TRANSCRIPT
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Today: Today:
• Photosynthesis Photosynthesis and and RespirationRespiration
• LunchLunch
• Quiz 5Quiz 5
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Step 1: Step 1:
• Capture your Capture your thoughts and thoughts and questions…questions…
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Let’s start with
Photosynthesis
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An Overview of Photosynthesis
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LIGHT used in Photosynthesis
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So What is this Plant Doing?
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LIGHT used in Photosynthesis
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When PHOTONS hit a Chlorophyll Molecule they EXCITE ELECTRONS
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Redox Reactions
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The Gain and Loss of Electrons through REDOX reactions allows
for
ELECTRON TRANSPORT CHAINS
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Noncyclic electron flow generates
ATP and NADPH
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What is NADPH?What is NADPH?
I carry electrons
!
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What is ATP?
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Cartoon Schematic
of NONCYCLICELECTRON
FLOWin the LIGHT
REACTIONS
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More on Making ATP…
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Something More Familiar?
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What Should We Do With the ATP and Electrons (NADPH)??
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The Light-The Light-Independent Independent
ReactionsReactions
The Calvin Cycle
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What Might a Plant Do With These Sugars?
Grow new leaves?Grow new leaves? Store it for Store it for
winter?winter? Build a fruit?Build a fruit? Use it to generate Use it to generate
the energy to the energy to support life!support life!
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Onto Onto Respiration! Respiration!
Note that Energy Note that Energy Flow is Flow is
Directional, but Directional, but Matter is CycledMatter is Cycled
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Cellular RESPIRATION: An Overview
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Step 1: Step 1: GlycolysisGlycolysis
http://instruct1.cit.cornell.edu/courses/biomi290/ASM/glycolysis.dcr
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Step 2: The Citric Acid Cycle
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The Citric Acid (Kreb’s)
Cycle: A Friendly View
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Step 3: The Electron Transport Chain
So far, only 4 molecules of ATP from each Glucose
Where’s the rest of the energy??
How can we capture it??It’s in the electrons!! So we need an electron transport
chain!!
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The ETC pumps H+ into the The ETC pumps H+ into the intermembrane space, creating a intermembrane space, creating a
concentration gradientconcentration gradient
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ATP Synthase is a Molecular
Turbine!
http://www.sp.uconn.edu/%7Eterry/images/movs/synthase.mov
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Energetic Summary of Cellular Respiration:
Efficiency = ~40%
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Can we generate ATP under Can we generate ATP under anaerobic conditions?? How??anaerobic conditions?? How??
Aerobic = oxygen present
Anaerobic = without oxygen
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Glycolysis!
Can this proceed
indefinitely? Why or why
not?
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Anaerobic Respiration: Alcohol Fermentation
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Anaerobic Respiration: Lactic Acid Fermentation
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Applying Your Understanding Applying Your Understanding of Photosynthesis and of Photosynthesis and
RespirationRespiration
What does it mean What does it mean to be a carbon to be a carbon source? source?
What does it mean What does it mean to be a carbon sink?to be a carbon sink?
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What IS the Carbon Cycle?
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Applying Your Understanding of
Photosynthesis and Respiration
Is the Amazon Basin a carbon
source, or a carbon sink? How could
you find out?