chapter 6 i. photosynthesis: capturing and converting energy · 2009-11-20 · e. energy-storing...
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Chapter 6
I. Photosynthesis: Capturingand Converting Energy
A. Importance ofPhotosynthesis1. Provides carbon for
organic compounds.2. Provides stored
energy (glucose) forthe synthesis oforganic compoundsand other cellactivities.
3. Provides Oxygen.4. Keeps CO2 levels
down.
CO2 O2
Photosynthesis
Respiration
Sunlight
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B. Photosynthesis6CO2 + 6H2O + light C6H12O6 + 6O2
C. Autotrophs andHeterotrophs1. Autotrophs
a. Use a source of energy, such as sunlight,to produce food from inorganic molecules.
b. Plants, some bacteria.
2. Heterotrophsa. Obtain energy from the food they eat.
i. Autotrophs, other heterotrophs, organic wastes
b. Animals, fungi, bacteria.
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D. Pigments
1. Pigments –colored substanceswhich absorb light.
2. Chlorophyll is theprimary pigmentutilized inphotosynthesis.
3. Light energy isnecessary forphotosynthesis.
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E. Energy-Storing Compounds
1. How does a plant trap theenergy from sunlight?a. Energy from the sunlight is
transferred to electrons.b. Chlorophyll acts like a solar
cell. Energy from light istrapped and transferred toelectrons.
c. The high energy electrons aretrapped in chemical bonds
E. Energy-Storing Compounds
2. NADP+ + 2e- + H+ NADPHa. NADPH is an electron carrierb. The Hydrogen and the electrons from
NADPH are used to build sugars.
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