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Cell EnergyATP, Photosynthesis and Cell Respiration
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Energy:• Energy for living things comes from food. Originally,
the energy in food comes from the sun.
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• Organisms that use light energy from the sun to produce food—autotrophs (auto = self)Ex: plants and some microorganisms (some bacteria and protists)
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• Organisms that CANNOT use the sun’s energy to make food—heterotrophsEx: animals and most microorganisms
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Adenine Ribose 3 Phosphate groups
Cell Energy:• Cells usable source of energy is called ATP• ATP stands for adenosine triphosphate
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• ADP stands for adenosine diphosphate
Adenine Ribose 2 Phosphate groups
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• ATP is converted into ADP by breaking the bond between the second and third phosphate groups and releasing energy for cellular processes.
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Photosynthesis:• Photosynthesis is the process by which the energy of
sunlight is converted into the energy of glucose
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• Photosynthesis occurs in the chloroplasts of plants
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• Light absorbing compound is a pigment—pigments absorb some wavelengths of light and reflect others—the color our eyes see is the color that the pigment reflects
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• Chlorophyll is the pigment inside the chloroplast the absorbs light for photosynthesis
As the chlorophyll in leaves decays in the autumn, the green color fades and is replaced by the oranges and reds of carotenoids.
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• General formula for photosynthesis:
carbon dioxide + water + light glucose + oxygen
6CO2 + 6H2O + light C6H12O6 + 6O2
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Reactants
Products
LightH2O CO2
O2C6H12O6
Glucose
Chloroplast
LightDependent
Reaction
Calvin Cycle
NADP+ADP + P
ATPNADPH
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Summary:• Light Dependent Reaction
—H2O is broken down and light energy is stored temporarily in inorganic energy carriers, ATP and NADPH
• Calvin Cycle—energy is transferred from ATP and NADPH to the organic compound glucose
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Cellular Respiration: (2 kinds—Aerobic and Anaerobic)• Cellular respiration is the process by which the energy
of glucose is released in the cell to be used for life processes (movement, breathing, blood circulation, etc…)
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• Cells require a constant source of energy for life processes but keep only a small amount of ATP on hand. Cells can regenerate ATP as needed by using the energy stored in foods like glucose.
• The energy stored in glucose by photosynthesis is released by cellular respiration and repackaged into the energy of ATP.
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• Respiration occurs in ALL cells and can take place either with or without oxygen present.
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Aerobic Respiration: requires oxygen• Occurs in the mitochondria of the cell• Total of 36 ATP molecules produced• General formula for aerobic respiration:
C6H12O6 + 6O2 6 CO2 + 6H2O + 36 ATPglucose + oxygen carbon dioxide + water + energy
Human cells contain a specialized structure – the
mitochondrion – that generates energy.
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• Diagram
Glucose Glycolysis Electron Transport Chain
2
Krebs Cycle
Mitochondria
In Cytoplasm
2 32
Electrons carried in NADH
Electrons carried in NADH and
FADH2
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Summary:3 steps:1st glycolysis 2nd Krebs cycle3rd Electron Transport Chain (ETC)
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Anaerobic Respiration: occurs when no oxygen is available to the cell (2 kinds: Alcoholic and Lactic Acid)• Also called fermentation• Much less ATP produced than in aerobic respiration
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• Alcoholic fermentation—occurs in bacteria and yeast
Process used in the baking and brewing industry—yeast produces CO2 gas during fermentation to make dough rise and give bread its holes
glucose ethyl alcohol + carbon dioxide + 2 ATP
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• Lactic acid fermentation—occurs in muscle cells
Lactic acid is produced in the muscles during rapid exercise when the body cannot supply enough oxygen to the tissues—causes burning sensation in muscles
glucose lactic acid + carbon dioxide + 2 ATP
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Review
Write the equation for photosynthesisWhat are the reactants? products?Write the equation for cell respirationWhat are the reactants? products?How are the two processes related
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ConclusionsAll living organisms get their energy from the sun-directly or indirectlyPlants use light energy to make glucose, need ATP to metabolize it-ATP made in mitochondriaATP is energy for life, all living organisms need it to survive. Produced in the mitochondria.Bacteria make it in their cytoplasm