ch07_lecture-How Cells Acquire Energy

ch07_lecture-How Cells Acquire Energy - How Cells Acquire...

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Unformatted text preview: How Cells Acquire Energy Chapter 7 • Photoautotrophs – Carbon source is carbon dioxide – Energy source is sunlight • Heterotrophs – Get carbon and energy by eating autotrophs or one another Carbon and Energy Sources Photoautotrophs • Capture sunlight energy and use it to carry out photosynthesis – Plants – Some bacteria – Many protistans T.E. Englemann’s Experiment Background • Certain bacterial cells will move toward places where oxygen concentration is high • Photosynthesis produces oxygen T.E. Englemann’s Experiment Figure 7.1 Page 111 Linked Processes Photosynthesis • Energy-storing pathway • Releases oxygen • Requires carbon dioxide Aerobic Respiration • Energy-releasing pathway • Requires oxygen • Releases carbon dioxide Chloroplast Structure two outer membranes inner membrane system (thylakoids connected by channels) stroma Figure 7.3d, Page 116 Photosynthesis Equation 12H 2 O + 6CO 2 6O 2 + C 2 H 12 O 6 + 6H 2 O Water Carbon Dioxide Oxygen Glucose Water LIGHT ENERGY In-text figure Page 115 Where Atoms End Up Products 6O 2 C 6 H 12 O 6 6H 2 O Reactants 12H 2 O 6CO 2 In-text figure Page 116 Two Stages of Photosynthesis sunlight water uptake carbon dioxide uptake ATP ADP + P i NADPH NADP + glucose P oxygen release LIGHT- INDEPENDENT REACTIONS LIGHT- DEPENDENT REACTIONS new water In-text figure Page 117 Electromagnetic Spectrum Shortest Gamma rays wavelength X-rays UV radiation Visible light Infrared radiation Microwaves Longest Radio waves wavelength Visible Light • Wavelengths humans perceive as different colors • Violet (380 nm) to red (750 nm) • Longer wavelengths, lower energy Figure 7.5a Page 118 Photons • Packets of light energy • Each type of photon has fixed amount of energy • Photons having most energy travel as shortest wavelength (blue-violet light) Pigments...
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ch07_lecture-How Cells Acquire Energy - How Cells Acquire...

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