CH 6 - CH.6.whereitstartsphotosynthesis Objectives:

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CH. 6. where it starts —photosynthesis    Objectives :     1.     Understand the main pathways by which energy from the sun or from specific chemical  reactions          enters organisms and passes from organism to organism and/or back into the environment. 2.     Know the steps of the light-dependent and light-independent reactions. Know the raw  materials          needed to start each phase, and know the products from each phase. 3.     Be familiar with the complex relationship between photosynthesis, CO 2 , and global warming.     Key Terms : autotrophs heterotrophs photosynthesis electromagnetic spectrum wavelength visible light photons pigments chlorophyll  a chlorophyll  b accessory pigment carotenoids xanthophylls phycobilins anthocyanin light-dependent reactions light-independent reactions chloroplasts stroma thylakoid membrane photosystems reaction center electron transfer chains ATP synthases photolysis cyclic pathway type I photosystem
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chlorophyll P700 noncyclic pathway type II photosystem Calvin-Benson cycle rubisco RuBP PGA carbon fixation PGAL cuticle stomata C3 plants C4 plants CAM plants   Lecture Outline: Impacts, Issues: Sunlight and Survival A.    Most autotrophs make use of photosynthesis to make food out of carbon dioxide and water. 1.     Plants are a type of photoautotrophs, are self-nourishing; heterotrophs must be nourished by  others. 2.     Each year plants produce about 220 billion tons of sugar and release oxygen to the  atmosphere. B.    The first cells were chemoautotrophs that extracted energy from simple inorganic and  organic compounds in the environment. 1.     It took upwards of a billion years for light-trapping metabolic pathways to evolve. 2.     Oxygen enrichment of the early atmosphere was a function of the collective oxygen  production of these evolving photoautotrophs. a.     The increase in abundance of oxygen combining with free radicals altered the species mix  on earth. b.     Organisms that harvested energy via aerobic respiration put oxygen’s reactive properties to  use. C.    The evolution of photoautotrophs in the distant past make modern life possible. 6.1      Sunlight as an Energy Source A.    Properties of Light 1.     Visible light represents a part of the electromagnetic spectrum. a.     One property of radiant energy is that it travels in wavelengths. Wavelength refers to the  distance between crests of these waves. b.     Light energy is packaged as photons, which vary in energy as a function of wavelength.
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This note was uploaded on 12/21/2010 for the course BIO 03 taught by Professor Garcia during the Fall '08 term at Los Angeles City College.

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CH 6 - CH.6.whereitstartsphotosynthesis Objectives:

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