12.2.12-photosynthesis cellular respiration powerpoint...adp (adenosine diphosphate) same as atp,...
TRANSCRIPT
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PHOTOSYNTHESISChapter 8
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ENERGY & LIFE
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ENERGYThe ability to do work.
Can be stored in chemical bonds.
Cells need energy to do things like active transport, dividing, moving, and producing and storing proteins.
http://www.youtube.com/watch?v=qybUFnY7Y8w
https://www.youtube.com/watch?v=YWk9N92-wvg
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ATP (ADENOSINE TRIPHOSPHATE) The main energy storage compound for living
things.
ATP is NOT good to storing lots of energy for a long time (glucose is used then).
Has three phosphate groups.
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ADP (ADENOSINE DIPHOSPHATE) Same as ATP, but with only two phosphate
groups.
When a cell has extra energy, it stores it by adding a phosphate group to ADP, making ATP.
To release the energy, the bond is broken, converting ATP back to ADP.
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PHOTOSYNTHESIS: ANOVERVIEW
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LIGHT & PIGMENTWhite light is actually a mixture of different
wavelengths of light.
Pigments: light absorbing molecules that gather the sun’s energy. The plant’s principle pigment is chlorophyll.
Energy absorbed by chlorophyll is transferred directly to electrons in the chlorophyll molecule. These high energy electrons make photosynthesis work.
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SO WHY ARE LEAVES GREEN?• Look at the wavelengths of light that chlorophyll absorbs & uses in photosynthesis• The colors that are left are reflected back and that is what you see.
Why Leaves Change Color
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ENERGY CARRIERS NADP+: an “uncharged” energy carrier
• Similar to ADP
NADPH: the “charged” version Similar to ATP
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PHOTOSYNTHESIS: AN OVERVIEW● THE PROCESS THAT CAPTURES LIGHT ENERGYAND USES IT TO MAKE CARBOHYDRATES (GLUCOSE).
6H2O + 6CO2 ----------> C6H12O6+ 6O2
sunlight
Carbon Dioxide: Comes in from the
air
Water: Comes in through the roots
Glucose: Stored as chemical energy
Oxygen: leaves back to the air
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FACTORS AFFECTINGPHOTOSYNTHESIS Temperature
Best between 0 & 35˚C Light intensity
A higher intensity increases the rate of photosynthesis until a maximum rate is reached.
Water A shortage can stop photosynthesis.
http://www.youtube.com/watch?v=LgYPeeABoUs
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THE PROCESS OFPHOTOSYNTHESIS
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WHERE DOES IT TAKE PLACE? In the chloroplasts.
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PHOTOSYNTHESIS 2 Parts:
Light dependent reactions Light independent reactions (AKA the Calvin Cycle)
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LIGHT DEPENDENTREACTIONS1.) chlorophyll absorbs
light
2.) H2O is split; O2 is released
3.) energy is transferred to energy carriers (ATP & NADPH), which go to the Calvin cycle
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LIGHT INDEPENDENTREACTIONS/ THE CALVIN CYCLE
1.) energy carriers are broken down, uncharged versions are recycled back to the light dependent reaction
2.) the energy released is used to convert CO2to C6H12O6
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CELLULARRESPIRATION & FERMENTATIONChapter 9
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CELLULARRESPIRATION: ANOVERVIEW
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CALORIEThe amount of energy needed to
raise 1g of H2O 1○ C. When burned, 1g of glucose
releases 3811 calories of heat energy.
Food labels show Calories (= 1000calories).
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TWO MORE ELECTRONCARRIERSNAD+ & FAD: “uncharged” energy
carriers • Similar to ADP
NADH & FADH2: the “charged” versions Similar to ATP
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CELLULAR RESPIRATION Releases energy (ATP) by breaking down food in
the presence of oxygen.
C6H12O6 + 6O2 ----------> 6H2O + 6CO2
Glucose: Plants- have it
stored from photosynthesis; Animals- get it
from food
Water: released as waste
Oxygen: taken in from the
air
Carbon Dioxide: released into the
air
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THE PROCESS OFCELLULAR RESPIRATION
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CELLULAR RESPIRATIONThree parts:• Glycolysis• Kreb’s cycle• Electron Transport Chain
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GLYCOLYSIS Where? The cytoplasm1.) C6H12O6 is split to form 2 pyruvic acids (2C3H6O3)2.) the energy is captured in ATP & energy carriers
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KREB’S CYCLE Where? The
mitochondria1.) 2 pyruvic acids
(2C3H6O3) are broken down into CO2
2.) the energy is captured in ATP & energy carriers
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ELECTRON TRANSPORT CHAIN Where? The
mitochondria1.) Energy carriers are
broken apart; the energy released is used to make ATP
2.) O2 bonds with leftover H+ to make H2O
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FERMENTATION
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AEROBIC VS. ANAEROBIC When O2 is present & all of cellular respiration occurs, 36
ATPs are made from 1 C6H12O6. Aerobic: reactions that require oxygen (the Kreb’s cycle &
electron transport chain)
When there is no O2, only glycolysis occurs & 2 ATPs are made from 1 C6H12O6. Anaerobic: reactions that do not need oxygen (glycolysis)
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GLYCOLYSISAdvantage: ATP can be made
without oxygen
Disadvantage: the cell will run out of energy carriers & glycolysis will stop
So…Fermentation occurs!
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FERMENTATION Allows glycolysis to continue by converting electron
carriers Anaerobic
Two types: Alcoholic fermentation
Pyruvic acid -> alcohol + CO2 Lactic Acid fermentation
Pyruvic acid -> lactic acid