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PHOTOSYNTHESIS
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Energy• Stored in chemical
bonds of compounds.
• Compounds that store energy: ATP, and NADPH.
• When bonds are broken, energy is released.
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• Chief energy storing molecule.• Made of: Adenine, Ribose, Phosphates• Used for:
– Mechanical functions– Active transport– Breakdown/synthesis of large molecules
• Regenerates
ATP
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Sources of Energy• Autotrophs
– can make own food– photosynthesis– producers
• Heterotrophs– get food from others– consumers
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PHOTOSYNTHESIS
The process by which autotrophs(plants) convertsunlight into a usable form of energy.
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Leaves contain an important pigment called chlorophyll.Chlorophyll
absorbs red, blue and violet wavelengths of light from the sun and reflects the color green.
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Chlorophyll is located in an organelle called chloroplast.
Chloroplast carries out the process of photosynthesis
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3 structures of chloroplast:Thylakoid (single disks that absorb energy & act like tiny batteries)
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Stroma: gel-like materialthat lies between thestacks of grana and actsas an insulator.
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2 cycles for Photosynthesis
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1. Light-Dependent Reactions (light phase) - •Occurs in the grana.•Leaf takes in sunlight &
water together with ADP & NADP+.•Makes ATP, oxygen and
NADPH.
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2.Light-Independent Reactions or Calvin Cycle (dark phase)-
•Occurs in the stroma.•Needs carbon dioxide.•Uses ATP & NADPH for
energy & hydrogen. • The end product is
glucose which is stored as starch if not used immediately.
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Chemical Equation for
Photosynthesis
6 CO2+ 6 H2O 6 O2 + C6H12O6 Carbon dioxide +water +sunlight (yields) oxygen +
glucose
sunlight
How does this relate to Cellular Respiration?
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PHOTOTROPISM
• Response to light