Lecture 04-1

Lecture 04-1 - LECTURE 4: PHOTOSYNTHESIS & RESPIRATION...

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LECTURE 4: PHOTOSYNTHESIS & RESPIRATION Photosynthesis I. Intro II. Properties of light and pigments III. Chloroplast structure and function IV. Light reactions V. “Dark” or Carbon reactions VI. Summary and conclusions Cellular Respiration I. Energy and food chains II. Carbon Cycle
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I. Introduction to photosynthesis From the Greek PHOTO = produced by light SYNTHESIS = a whole made of parts put together. Definition : PHOTOSYNTHESIS is the process whereby plants, algae, some bacteria, use the energy of the ______ to synthesize organic compounds ( __________ ) from inorganic compounds ( CO 2 and water ).
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WHY IS PHOTOSYNTHESIS SO IMPORTANT? PHOTOSYNTHESIS is one of the most important biological process on earth! Provides the oxygen we breathe Consumes much of the ______ F_________ E_________ Fibers and materials
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GENERAL FORMULA FOR PHOTOSYNTHESIS light 6 CO 2 + 12 H 2 O ---------> C 6 H 12 O 6 + 6 O 2 + 6 H 2 O pigments, enzymes * * Oxygen on earth allowed for the evolution of aerobic respiration and higher life-forms. Respiration: extracting energy from compounds (sugars) C 6 H 12 O 6 + O 2 6 CO 2 + ATP
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II. PROPERTIES OF LIGHT Virtually all life depends on it! Light moves in waves, in energy units called _______________ Energy of a PHOTON ______________ proportional to its wavelength Visible light (between UV and IR) occurs in a spectrum of colors
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V_________ light contains just the right amount of _________ for biological reactions
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Light is absorbed by p___________ The ____________ pigment for photosynthesis is chlorophyll a _______________ – traps light It absorbs blue and red light, not _____ (green light is reflected back!) Absorption spectrum of chlorophyll a
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Absorption spectrum of chlorophyll a : BLUE & __________ Action spectrum of photosynthesis closely matches absorption spectrum of chlorophyll a , but not perfectly (due to ______________ pigments)
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Accessory pigments like chlorophyll ___ and carotenoids (beta-carotene, lycopene): absorb light at different wavelengths, (extending the absorption range) help transfer some energy to chlorophyll a ____________ cell from harmful byproducts
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C____________ a is the primary photosynthetic pigment that drives photosynthesis. A________ pigments absorb at different wavelengths, extending the range of light useful for photosynthesis.
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Where in the plant cell? ________ Where in the plant does photosynthesis occur? ____________
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III. Chloroplast structure and function: A solar chemical factory Football shaped S_________ Thylakoid membrane Grana (stacks) stroma Grana thylakoids lumen
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Inside a Chloroplast Remember: Structure correlates to function!
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Lecture 04-1 - LECTURE 4: PHOTOSYNTHESIS & RESPIRATION...

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