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Copy of Biology Chapter 8 Section 3 Reactions of Photosynthesis

Miller Levine Dragonfly Book

Emily Lockhart

on 18 February 2013

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Transcript of Copy of Biology Chapter 8 Section 3 Reactions of Photosynthesis

Light-Dependent Reactions of Photosynthesis Light-Independent
"Dark" 8-3 The Reactions of Photosynthesis Chloroplast Plant cells Plant In plants, photosynthesis takes place inside chloroplasts. Inside a Chloroplast Single
thylakoid Chloroplast Chloroplasts contain thylakoids—saclike photosynthetic membranes. Inside a Chloroplast Chloroplast Granum Thylakoids are arranged in stacks known as grana. A singular stack is called a granum. Inside a Chloroplast Photosystems Chloroplast Photosystems are the light-collecting units of the chloroplast. They contain chlorophyll. Inside a Chloroplast Calvin cycle Sugars CO Calvin Cycle O NADP+ ADP + P Light-dependent reactions H O Inside a Chloroplast When electrons in chlorophyll absorb sunlight, the electrons gain a great deal of energy.

Electron carriers transport these high-energy electrons from chlorophyll to other molecules. Electron Carriers One carrier molecule is NADP+.

NADP+ + 2 high-energy electrons = NADPH Electron Carriers The light-dependent reactions require light.

The light-dependent reactions produce oxygen gas and convert ADP and NADP+ into the energy carriers ATP and NADPH. Light-Dependent Reactions Light-Dependent Reactions Photosystem I + O2 High-energy electrons move through the electron transport chain from photosystem II to photosystem I. 2H2O Photosystem II Light-Dependent Reactions 2 NADPH 2 As electrons are passed from chlorophyll to NADP+, more H+ ions are pumped across the membrane. 2H2O 2 NADP+ Light-Dependent Reactions + O2 2 NADPH 2 ADP ATP synthase + O2 2H2O 2 NADP+ Light-Dependent Reactions Because of this system, light-dependent electron transport produces not only high-energy electrons but ATP as well. What is the Calvin cycle's function? The Calvin Cycle
The Calvin cycle uses ATP and NADPH from the light-dependent reactions to fix CO producing high-energy sugars.

Light-independent reactions The Calvin Cycle NADPH 12 ADP 12 12 NADP+ 12 Energy Input The energy for this conversion comes from ATP and high-energy electrons from NADPH. The Calvin Cycle 6 ADP 6 Sugars and other compounds 5-Carbon Molecules Regenerated 12 NADP+ NADPH 12 12 ADP 12 The cycle continues with more input of energy from ATP and NADPH. The carbon fixed from carbon dioxide leaves the cycle as sugar. The Calvin Cycle The two sets of photosynthetic reactions work together.

The light-dependent reactions trap sunlight energy in chemical form.
The light-independent reactions use that chemical energy to produce stable, high-energy sugars from carbon dioxide and water. In plants, photosynthesis takes place inside the
chlorophyll. 8-3 Energy to make ATP in the chloroplast comes most directly from
hydrogen ions flowing through an enzyme in the thylakoid membrane.
transfer of a phosphate from ADP.
electrons moving through the electron transport chain.
electrons transferred directly from NADPH. 8-3 NADPH is produced in light-dependent reactions and carries energy in the form of
high-energy electrons.
low-energy electrons.
ADP. 8-3 What is another name for the Calvin cycle?
light-dependent reactions
light-independent reactions
electron transport chain
photosynthesis 8-3 Which of the following factors does NOT directly affect photosynthesis?
water supply
light intensity 8-3 END OF SECTION 2 2 2 Thylakoid Membrane Inside Outside 2 http://www.youtube.com/watch?v=1vRMDFK0oq8&list=UUiGrAP5S5wwRQqJC09lgYjg&index=7&feature=plcp http://www.dailymotion.com/video/x4mtsz_zoom-into-a-leaf_tech?ralg=behavior-meta2#from=playrelon-8
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