Light Energy and Photosynthetic Pigments •All photosynthesis reactions occur within the chloroplasts •Partly within the stroma and partly within thylakoid membranes •Chloroplasts contain their own DNA and ribosomes and are able to replicate by fission
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Light Energy and Photosynthetic Pigments All photosynthesis reactions occur within the chloroplasts Partly within the stroma and partly within thylakoid.
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Light Energy and Photosynthetic Pigments
Light Energy and Photosynthetic Pigments
•All photosynthesis reactions occur within the chloroplasts
•Partly within the stroma and partly within thylakoid membranes
•Chloroplasts contain their own DNA and ribosomes and are able to replicate by fission
The stages• Stage 1: Capturing light energy• Stage 2: Using captured light energy to make ATP and
reduce NADP+ to NADPH • Stage 3: Using the free energy of ATP and the reducing
power of NADPH to make glucose and oxygen
How does this occur
• Various forms of radiation surround us, from the sun and other sources.
• Some are visible and some are invisible.
Wave model of light
• Electromagnetic radiation travels at 300000000m/s
• Frequencies of visible radiation (light) are perceived as different colours We can remember the visible spectrum with ROYGBIV!
• Frequencies of visible radiation (light) are perceived as different colours.
•Highest frequency, smallest wavelength = violet
•Lowest frequency, largest wavelength = red
•All frequencies and wavelengths = white
Light• Electromagnetic radiation, travelling at 3x108 m/s• Exhibits properties of waves and photons (particles)• Wavelength is inversely proportional to its energy Visible