Photosynthesis and Cellular Respiration

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Photosynthesis and Cellular Respiration
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Two ways to get food

• troph food
• Autotrophs
• Auto self
• Autotrophs make their own food
• Heterotrophs
• Hetero different
• Heterotrophs get their food from something else
  (they have to eat it)

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Two ways to get food

• Autotrophs
• Plants
• Heterotrophs
• Animals

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Photosynthesis
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Photosynthesis

• Converts the suns energy into chemical energy
  stored in sugar
• Takes place in specialized structures inside
  plant cells called chloroplasts
• Chlorophyll is the pigment that absorbs sunlight.

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Photosynthesis Reaction

• 6CO2 6 H2O light
• energy ? C6H12O6
  6O2
• The food plants make is called glucose (sugar)

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Photosynthesis

• 2 different reactions
• Light Reactions
• Capture light energy for photosynthesis
• Calvin Cycle
• Produces glucose sugar

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Cellular Respiration
Cells
Breathing
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Cellular Respiration

• Happens in both plant and animal cells
• Overall Reaction
• C6H12O6 6O2 ? 6CO2 6H2O

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Cellular Respiration Overview

• Depends on whether or not there is oxygen
• Aero oxygen
• Aerobic Respiration makes energy
• Anaerobic Respiration Fermentation (makes
  alcohol)

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Step 1 Glycolysis

• The energy that cells make and use is called ATP
• Adenosine triphosphate
• Glycolysis makes 2 molecules of ATP (energy)
• Glycolysis happens in the cytoplasm of the cell

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Step 2 Check for Oxygen

• If oxygen is present, the cell can make more ATP
• If no oxygen is present, the cell has to recycle
  the pieces from glycolysis and makes alcohol.

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Step 3 with oxygenCellular Respiration

• Oxygen requiredaerobic
• 2 more sets of reactions which occur the cells
  mitochondria
• 1. Krebs Cycle makes 2 ATP
• Also called the Citric Acid Cycle
• 2. Electron Transport Chain makes 32-34 ATP

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Krebs Cycle (Citric Acid Cycle)
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Step 3 without oxygen Fermentation

• The cell must recycle the materials from
  glycolysis.
• This recycling process is called fermentation.
• The product of fermentation is alcohol.

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Energy Tally

• 36 ATP for aerobic vs. 2 ATP for anaerobic
• Glycolysis 2 ATP
• Krebs 2 ATP
• Electron Transport 32 ATP
• 36 ATP
• Anaerobic organisms cant be too energetic but
  are important for global recycling of carbon

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