CH 7.pptx

CH 7.pptx - How Cells Acquire Energy Chapter 7 Carbon and...

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How Cells Acquire Energy Chapter 7
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Photoautotrophs Carbon source is carbon dioxide (CO2) Energy source is sunlight Heterotrophs Can’t produce their own food source Get carbon and energy by eating autotrophs or one another Carbon and Energy Sources
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Photoautotrophs Capture sunlight energy and use it to carry out photosynthesis Plants Some Bacteria Many protistans (single-celled eukaryotes)
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Englemann’s Experiment Certain bacterial cells will move toward places where oxygen concentration is high Photosynthesis produces oxygen as a by-product
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Englemann’s Experiment Notice that the bacteria (white specks) concentrate in 2 separate color regions, where oxygen concentration is higher
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Photosynthesis and Cellular Respiration are Linked Processes Photosynthesis Energy-storing pathway Releases oxygen Requires carbon dioxide Aerobic Respiration Energy-releasing pathway Requires Oxygen Releases carbon dioxide
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Photosynthesis and Cellular Respiration are Linked Processes
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Leaf Anatomy Flattened leaf shape exposes large surface area to catch sunlight Upper and lower leaf surfaces of a leaf comprise the epidermis Waxy, waterproof cuticle on outer surfaces reduces water evaporation
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Leaf Anatomy Adjustable pores called stomata allow for entry of air with CO2 Inner Mesophyll cell layers contain majority of chloroplasts Vascular bundles (veins) supply water and minerals to the leaf while carrying sugars away from the leaf
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Leaf Anatomy
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Anatomy of a Chloroplast Mesophyll cells have 40-200 chloroplasts each Chloroplasts are bounded by a double outer membrane composed of the inner and outer membranes The stroma is the semi-fluid medium within the inner membrane Disk-shaped sacs called thylakoids found within the stroma in stacks called grana
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0 Anatomy of a Chloroplast
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0 Anatomy of a Chloroplast Stroma : fluid within chloroplast Thylakoid : one of the sacs within a chloroplast; chlorophyll is built into the thylakoid membranes; “penny-like” appearance Granum : a stack of thylakoids within a chloroplast; “stack of pennies” appearance
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Photosynthesis Equation 12H 2 O + 6CO 2 6O 2 + C 6 H 12 O 6 + 6H 2 O LIGHT ENERGY Water Water glucose Water Carbon dioxide
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Where Atoms End Up 6O 2 C 6 H 12 O 6 6H 2 O 12H 2 O 6CO 2 reactants products
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CH 7.pptx - How Cells Acquire Energy Chapter 7 Carbon and...

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