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Go to Section: Plants and some other types of organisms are able to use light energy from the sun to produce their own food. Autotrophs – make their own.

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Presentation on theme: "Go to Section: Plants and some other types of organisms are able to use light energy from the sun to produce their own food. Autotrophs – make their own."— Presentation transcript:

1 Go to Section: Plants and some other types of organisms are able to use light energy from the sun to produce their own food. Autotrophs – make their own food Heterotrophs – obtain energy from the foods they consume or absorb. All organisms must release the energy in sugars and other compounds.

2 Go to Section: Adenine Ribose 3 Phosphate groups ATP

3 Go to Section: ADP ATP Energy Adenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP) Partially charged battery Fully charged battery Section 8-1

4 Go to Section: ADP ATP Energy Adenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP) Partially charged battery Fully charged battery Section 8-1

5 Go to Section: If ATP is such a useful source of energy, why do most cells have only enough ATP to last them for a few seconds of activity? o ATP is a great molecule for transferring energy; it is not a good molecule for storing large amounts of energy over the long term. o A single molecule of glucose stores more than 90 times the chemical energy of a molecule of ATP. o It is more efficient for cells to keep only a small supply of ATP on hand. o Cells regenerate ATP from ADP as needed by using the energy in glucose.

6 Go to Section: Light and Pigments In addition to water and carbon dioxide, photosynthesis requires light and chlorophyll, a molecule in chloroplasts.  Sunlight is a mixture of different wavelengths of light.  Plants gather the sun’s energy with light-absorbing molecules called pigments.  Chlorophyll is the plants’ principle pigment (chlorophyll a and chlorophyll b).  Chlorophyll absorbs light in the blue-violet and red regions of the visible spectrum. Green light is reflected by leaves.  When chlorophyll absorbs light, the energy from the sun is transferred to the electrons of the chlorophyll molecule.

7 Go to Section: Absorption of Light by Chlorophyll a and Chlorophyll b VBGYOR Chlorophyll b Chlorophyll a Section 8-2 Figure 8-5 Chlorophyll Light Absorption

8 Go to Section: Light Energy Chloroplast CO 2 + H 2 OSugars + O 2 Section 8-2 Photosynthesis: Reactants and Products

9 Go to Section:

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11 Chloroplast H2OH2O O2O2 Sugars CO 2 Light- Dependent Reactions Calvin Cycle NADPH ATP ADP + P NADP + Chloroplast Section 8-3 Figure 8-7 Photosynthesis: An Overview Light

12 Go to Section: Hydrogen Ion Movement Photosystem II Inner Thylakoid Space Thylakoid Membrane Stroma ATP synthase Electron Transport Chain Photosystem IATP Formation Chloroplast Section 8-3 Figure 8-10 Light-Dependent Reactions Light-Dependent Reactions

13 Go to Section: ChloropIast CO 2 Enters the Cycle Energy Input 5-Carbon Molecules Regenerated Sugars and other compounds 6-Carbon Sugar Produced Section 8-3 Figure 8-11 Calvin Cycle Calvin Cycle

14 Go to Section: Factors that affect the rate of photosynthesis: Availability of water Light intensity Temperature

15 Go to Section: Photosynthesis includes of take place in takes place in uses to produce use Light- dependent reactions Calvin cycle Thylakoid membranes StromaNADPH ATP Energy from sunlight ATPNADPHO2O2 Chloroplasts High-energy sugars Section 8-3 Concept Map CO 2 H2OH2O


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