Lecture9bio - Chemiosmosis • Charge and H concentration...

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BIOLOGY 1001 Wednesday, February 20, 2008 Lecture 10 Exam 2 will be March 5, 6, or 7 th Interconnections: Photosynthesis: Respiration: -Stores energy -Releases energy -Releases Oxygen -Uses Oxygen -Uses CO 2 -Releases CO 2 Figure 7-1 Structures of Photosynthesis Figure 7-2 Overviews of Photosynthesis Page 118 Light Dependent Reactions Pigments Chlorophyll = Main Pigment o Absorbs violet, blue, and red light. o Reflects green. Carotenoids = Accessory Pigments o Absorbs blue and green light. o Reflects yellow, orange, and red. Clicker Question: What color of light is least effective at driving photosynthesis? Answer: Green Why leaves are green: Visible color is from wavelengths not absorbed. Photosystems Page 119 Light-Dependent Reactions
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Pigments absorb light energy, lose e-, which enter electron transfer chains. Make ATP and NADPH Split water and release O 2 Pigment electrons are replaced. Figure 7-4
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Unformatted text preview: Chemiosmosis • Charge and H+ concentration gradients created between thylakoids and stroma. • H+ flows down gradients into stroma through ATP synthase. • Flow of H+ drives formation of ATP. Clicker Question: Which is a TRUE statement about the light-dependent reactions? Answer: Without water, the system would shut down. Light-Independent Reactions • Also known as, C3 and Calvin Benson. • Can proceed without light, but needs energy from ATP & NADPH. • Occur in the stroma. Figure 7-6 Clicker Question: The term “cycle” is used to describe the light-independent reactions (Calvin-Benson cycle) because___________. Answer: It begins and ends with the same thing, RuBP. Clicker Question: What is required for the C3 cycle to occur? Answer: ATP & NADPH The relationship between Light-Dependent and Light-Independent reactions: Figure 7-7 & Figure 7-8a...
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This note was uploaded on 06/09/2010 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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Lecture9bio - Chemiosmosis • Charge and H concentration...

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