photosynthesis

photosynthesis - BIOL 240W Photosynthesis All Around Us…...

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Unformatted text preview: BIOL 240W Photosynthesis All Around Us… • Welcome to the exciting world of Plant Biology! Plants are clearly all around us, making their presence felt on Earth. They provide for our food, shelter, clothing, medicine, and have countless other applications in our society. To understand the Zen of plants and their full effect on our world, we must explore the essential process of photosynthesis. Also, we must also strive to learn how dissolved oxygen is involved in the intricate process that helps sustain life. What is so great about Photosynthesis? How does it work? How is that that Oxygen, a mere waste product of plants from photosynthesis, is so necessary to our survival? How Does Photosynthesis Work? 6CO 2 + 6H 2 O + light → C 6 H 12 O 6 + 6O 2 Photosynthesis is the conversion of light energy to usable chemical energy that occurs through light reactions (converts the radiant photonic energy to chemical energy) and dark reactions (stored chemical energy of ATP and NADPH is used to produce carbohydrates) In algae, photosynthesis takes place in the chloroplasts. Chlorophyll, a green pigment that is essential for photosynthesis to take place, is rooted in the thylakoid membrane and absorbs varying wavelengths of energy received from photons (a form of radiant energy from the sun). Chlorophyll Breaking it Down: Chlorophyll A and B • Most important pigment in plants – Essential for photosynthesis • Contained in all green plants, algae, and perhaps cyanobacteria • Chlorophyll B absorbs red and blue wavelengths of visible light spectrum (same with chlorophyll A) • Blue & Red light are a part of White light (combination of all colors) Chlorophyll reflects green wavelengths and absorbs blue and red wavelengths, which give plants their green appearance. The splitting of water releases electrons, which travel to the electron acceptor NADP+, then lose energy, and finally reduce NADP+ to NADPH. This energy that is given off is used to drive ATP synthesis. WATER What we’re using: Chlorella • Chlorella is a type of single-celled algae that has existed and thrived on Earth for approximately two billion years!...
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This note was uploaded on 03/10/2008 for the course BIOL 240W taught by Professor Nelson,kimberlyn during the Spring '08 term at Penn State.

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photosynthesis - BIOL 240W Photosynthesis All Around Us…...

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