BIOS E-1a Lecture 07 092811 annotated

BIOS E-1a Lecture 07 092811 annotated - Lecture 7:...

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Unformatted text preview: Lecture 7: Photosynthesis Reading: Chapter 6 (concepts 6.5-6.6) Spalding et al. paper 1 Photosynthesis Energy within light is captured and used to synthesize carbohydrates 6CO 2 + 6H 2 O + light energy C 6 H 12 O 6 + 6O 2 CO 2 is reduced H 2 O is oxidized Energy from light drives this endergonic reaction Photosynthesis Energy within light is captured and used to synthesize carbohydrates 6CO 2 + 6H 2 O + light energy C 6 H 12 O 6 + 6O 2 CO 2 is reduced H 2 O is oxidized Energy from light drives this endergonic reaction 2 Photosynthesis powers the biosphere Biosphere: regions on the surface of the Earth and in the atmosphere where living organisms exist Largely driven by the photosynthetic power of green plants Cycle where cells use organic molecules for energy and plants replenish those molecules using photosynthesis Plants also produce oxygen 3 Trophic levels Heterotroph Must eat food, organic molecules from their environment, to sustain life Autotroph Make organic molecules from inorganic sources Photoautotroph Use light as a source of energy Green plants, algae, cyanobacteria 4 Photosynthesis and cellular respiration are linked 5 Chloroplast Organelles in plants and algae that carry out photosynthesis Chlorophyll: green pigment Majority of photosynthesis occurs in leaves in mesophyll Stomata: carbon dioxide enters and oxygen exits leaf 6 Chloroplast anatomy Outer and inner membrane Intermembrane space 3 rd membrane - thylakoid membrane contains pigment molecules Forms thylakoids Enclose thylakoid lumen Granum: stack of thylakoids Stroma: fluid filled region between thylakoid membrane and inner membrane 7 Leaf structure and composition 8 2 stages of photosynthesis Light reactions Uses light energy Take place in thylakoid membranes Produce ATP, NADPH and O 2 Calvin cycle Occurs in stroma Uses ATP and NADPH to incorporate CO 2 into organic molecules 9 Two stages of photosynthesis 10 Light energy Type of electromagnetic radiation Travels as waves Short to long wavelengths Also behaves as particles - photons Shorter wavelengths have more energy 11 Electromagnetic spectrum 12 Photosynthetic pigments absorb some light energy and reflect others Leaves are green because they reflect green wavelengths Absorption boosts electrons to higher energy levels Wavelength of light that a pigment absorbs depends on the amount of energy needed to boost an electron to a higher orbital Plants use light in the visible portion of the spectrum 13...
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BIOS E-1a Lecture 07 092811 annotated - Lecture 7:...

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