CH8 - 1 UNIT II. Cell Chapter 8 Photosynthesis CO 8 3...

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Unformatted text preview: 1 UNIT II. Cell Chapter 8 Photosynthesis CO 8 3 Student Learning Outcomes: Describe the balance between respiration and photosynthesis that sustains life in the biosphere. Explain the molecular basis of energy generated as a result of electron transport. Follow the path of energy from sunlight to covalent bonds formed during the light reactions of photosynthesis. Continue the path of energy from the light reactions through the Calvin Cycle. 4 Trophic organization Heterotroph Must eat food, organic molecules from their environment, to sustain life Autotroph Make organic molecules from inorganic sources Photoautotroph Use light as a source of energy Green plants, algae, cyanobacteria Table 27-1, p. 564. Campbell & Reece. 2008. Biology . 8 th ed. 6 Photosynthesis Energy within light is captured and used to synthesize carbohydrates CO 2 + H 2 O + light energy C 6 H 12 O 6 + O 2 + H 2 O CO 2 is reduced H 2 O is oxidized Energy from light drives this endergonic reaction 7 Photosynthesis Energy within light is captured and used to synthesize carbohydrates Energy from light drives this endergonic reaction 8 Biosphere Regions on the surface of the Earth and in the atmosphere where living organisms exist Largely driven by the photosynthetic power of green plants Cycle where cells use organic molecules for energy and plants replenish those molecules using photosynthesis Plants also produce oxygen 9 Biosphere >20% of the worlds oxygen is produced in the Amazon rain forest Rain forests once covered 14% of the Earths land surface but now occupy <6% ( pp. 153-154) 10 Chloroplast Organelles in plants and algae that carry out photosynthesis Chlorophyll- green pigment Majority of photosynthesis occurs in leaves in central mesophyll Stomata- carbon dioxide enters and oxygen exits leaf Fig. 8.1, p. 153 12 Chloroplast anatomy (pp. 152-153) 13 Chloroplast anatomy Outer and inner membrane Intermembrane space Thylakoid membrane contains pigment molecules Thylakoid membrane forms thylakoids Enclose thylakoid lumen Granum- stack of thylakoids Stroma- fluid filled region between thylakoid membrane and inner membrane Fig. 8.2, p. 153 15 2 stages of photosynthesis Light reactions Take place in thylakoid membranes Produce ATP, NADPH and O 2 Calvin cycle Occurs in stroma Uses ATP and NADPH to incorporate CO 2 into organic molecules 16 2 stages of photosynthesis Light reactions Take place in thylakoid membranes Produce ATP, NADPH and O 2 Calvin cycle Occurs in stroma Uses ATP and NADPH to incorporate CO 2 into organic molecules Fig. 8.2, p. 153 Fig. 8.1-5, p. 153 19 Light energy Type of electromagnetic radiation Travels as waves Short to long wavelengths Also behaves as particles- photons Shorter wavelengths have more energy Fig. 8.3, p. 154. The Electromagnetic Spectrum 21...
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CH8 - 1 UNIT II. Cell Chapter 8 Photosynthesis CO 8 3...

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