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Unformatted text preview: Introduction to Biological Sciences 110a In class notes for October 8, 2007 • Discussion session today at 5:10pm on metabolism • Help sessions this week are tomorrow, Tuesday October 9, 2007 and Friday October 14, 2007, both at 4:10pm • Photosynthesis o Happens in the chloroplasts (in plants) o Chloroplasts are like mitochondria in several ways (look in previous lectures) o Photosynthesis takes place in the thylakoid membrane and the stroma. o There are two steps in photosynthesis Light reactions • Light energy makes ATP and NADPH • Take place in the thylakoid membrane Carbon-fixation (light-independent) reactions • The ATP and the NADPH that were produced in the light reactions, are used to make carbohydrates from CO 2 and water • Take place in the stroma • Light reactions o Light is absorbed by pigments (substances that absorb light) o The most important pigments are the chlorphylls and acessory pigments o The pigments are all prosthetic groups in membrane protein o The chlorophylls look a like heme groups except the chlorophyll group contains a Mg ++ o The accesory pigments are not usually highly concentrated o The chlorophylls are bound to proteins o The energy from the chlorophyll is transferred to a electron transport system o The three protein complexes in the thylakoid membrane Introduction to Biological Sciences 110a...
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- Fall '08
- Photosynthesis, thylakoid membrane