Session no. 3.1. energy transformation atp – adp cycle and photosynthesis
Ch 8 Photosynthesis. Chemical Energy and ATP energy is the ability to do work cells use energy to...
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Transcript of Ch 8 Photosynthesis. Chemical Energy and ATP energy is the ability to do work cells use energy to...
![Page 1: Ch 8 Photosynthesis. Chemical Energy and ATP energy is the ability to do work cells use energy to build new molecules, contract muscles, and carry out.](https://reader035.fdocuments.in/reader035/viewer/2022070415/56649e3f5503460f94b30494/html5/thumbnails/1.jpg)
Ch 8 Photosynthesis
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Chemical Energy and ATP• energy is the ability to do work• cells use energy to build new molecules, contract
muscles, and carry out active transport• w/o ability to obtain and use energy, life would
cease to exist• adenosine triphosphate (ATP) – one of most
important compounds cells use to store and release• cells release energy stored in ATP by breaking bonds
between phosphate groups
![Page 3: Ch 8 Photosynthesis. Chemical Energy and ATP energy is the ability to do work cells use energy to build new molecules, contract muscles, and carry out.](https://reader035.fdocuments.in/reader035/viewer/2022070415/56649e3f5503460f94b30494/html5/thumbnails/3.jpg)
Heterotrophs and Autotrophs• autotrophs - organisms that make their own food• photosynthesis - process by which autotrophs use
the energy of sunlight to produce high-energy carbohydrates for food – plants, algae, and some bacteria are able to use
light energy from the sun to produce food• heterotrophs - organisms that obtain food by
consuming other living things– get food by: eating plants, feeding on plant-
eating animals, or decomposing other organisms
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Heterotrophs and Autotrophs
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Light• all energy everywhere originates from the sun• travels to Earth in the form of light• sunlight = different wavelengths, visible light
spectrum: rainbow• compound that absorbs light absorbs energy• chlorophyll absorbs visible light very well
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Pigments• plants gather the sun’s energy with light-
absorbing molecules called pigments• principal pigment is chlorophyll– absorb light very well in all regions except green ->
reflects green light -> why plants look green– colder temps -> chlorophyll breaks down, the red and
orange pigments may be seen
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Chloroplasts• photosynthesis takes place inside chloroplasts• chloroplasts contain saclike photosynthetic
membranes called thylakoids– arranged in stacks known as grana– chlorophyll located
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An Overview of Photosynthesis• uses the energy of sunlight to convert H2O and
CO2 (reactants) into high-energy sugars – glucose and oxygen (products)
• plants use sugars to produce complex carbs (starches) that are used for energy