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Unformatted text preview: 1 April 10, 2008 April 10, 2008 Biology 113, Lecture 6 Biology 113, Lecture 6 • Relationship between photosynthesis and respiration • Overview of photosynthesis • Light¡reactions • Cyclic versus Non-cyclic reactions Concepts: 10.1 and 10.2 Part 1 Part 1 - Overview Overview Relationship Relationship between between photosynthesis photosynthesis and cellular and cellular respiration respiration Fig. 9.2 many parallels but they run in reverse • Chloroplasts are the organelles in which photosynthesis occurs • Photosynthesis is summarized as: Photosynthesis converts light energy to the Photosynthesis converts light energy to the chemical energy of food. chemical energy of food. 6 CO 2 + 12 H 2 O + Light energy → C 6 H 12 O 6 + 6 O 2 + 6 H 2 O (sugars) Chloroplasts Chloroplasts - Site of Photosynthesis Site of Photosynthesis Fig. 10.3 Vein Leaf cross section Mesophyll CO 2 O 2 Stomata Mesophyll Intermembrane space Chloroplast 5 μm Outer membrane Inner membrane Thylakoid space Thylakoid Granum Stroma 1 μm Chloroplasts Chloroplasts Fig. 10.3 6 CO 2 12 H 2 O Reactants: Products: C 6 H 12 O 6 6 H 2 O 6 O 2 Figure 10.4 Photosynthesis Photosynthesis – Tracking the atoms Tracking the atoms • Chloroplasts split water into hydrogen and oxygen , incorporating the electrons of hydrogen into sugar molecules, the oxygen as O 2 (sugars) Oxygen atoms come from water not the CO 2 2 modified Fig. 9.5 “Photosynthesis” Very endergonic reaction, energy input required Respiration extracts energy, Respiration extracts energy, while photosynthesis requires energy while photosynthesis requires energy Energy in (to “glucose” via NADPH) (electrons) (electrons) Energy out Light energy Overview of photosynthesis...
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This note was uploaded on 04/29/2008 for the course BIO 113 taught by Professor Swenson during the Spring '08 term at Ohio State.
- Spring '08