Photosynthesis

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Photosynthesis

• I. Types of organisms
• A. Heterotrophs
• 1. consumers
• a. must acquire food from outside
• b. carry out digestion to obtain energy
• 2.examples
• a. animals
• b. fungi
• c. many protists
• d. some monerans (bacteria)

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Photosynthesis

• B. Autotrophs
• 1. producers
• a. make own food using sunlight and small
  molecules
• b. use own food to carry out metabolism
• 2. Examples
• a. plants
• b. some protists
• c. some monerans

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Photosynthesis

• II. Photosynthesis
• Light
• Travels in waves
• Wavelength determines color
• Wavelength determines energy
• white light is made up of all colors
• ROY G. BIV

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The Equation

• Light
• 6CO2 6H2O ??? C6H12O6 6O2
• Light
• Carbon Dioxide Water ??Glucose Oxygen

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Photosynthesis

• III. Pigments
• A. Absorb some colors of light
• B. Reflect some colors of light
• 1. Red pigment
• Reflects red
• Absorbs OY G. BIV
• 2. Blue pigment
• Reflects blue
• Absorbs ROY G. IV
• 3. Black
• Absorbs all
• Reflects none
• 4. White
• Absorbs none
• Reflects all

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The Light Reactions

• IV. Photosystem I and II (light reactions)
• A. Light is Absorbed by Chlorophyll
• B. Light Energy is used to split H2O
• O2 is released
• ATP is produced (sent to Calvin Cycle)
• NADPH is produced (sent to Calvin Cycle)

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The Calvin Cycle

• V. The Calvin Cycle (dark reactions)
• A. RUBP 5C starting material
• 1. RUBP (5C) combines with CO2 6C
• 2. Molecules rearrange to form 2- 3C molecules
• 3. ATP and NADPH are added (from light rxns)
• 4. For every turn of cycle 1- 3C is removed
• 5. 2- 3C are converted to 1 glucose
• 6. RUBP is regenerated

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