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Energy = Life Life = Energy
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What is the ultimate source of energy on
Earth?• The Sun
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What is the difference between Autotrophs and
Heterotrophs?Autotrophs
• “self feeder”
• make food from inorganic molecules
• producers
Heterotrophs• “other eaters”
• get food by eating other organisms
• consumers
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How do they obtain their energy?
AutotrophsAutotrophs• Photosynthesis- uses Sun’s energy
to convert water and carbon dioxide into glucose.
Autotrophs and HeterotrophsAutotrophs and Heterotrophs• Cellular Respiration- use oxygen to
convert glucose into ATP.
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How does photosynthesis and respiration relate to one
another?
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What is energy? the ability to perform work• Potential energy: energy
that is stored; It may be converted to other types of energy.
Kinetic Energy: energy of motion.
Thermal Energy
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How is chemical energy a type of potential energy?
• A molecule can store energy between atoms.
• When atoms are released, energy is released.
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Organic molecules have structures that give them lots of chemical energy in the form of ATP.
How do we obtain energy from food?
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An analogy of respiration
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How do cells convert chemical energy into usable
energy?• Chemical energy stored in organic
molecules is converted to energy stored in a molecule called “ATP”
• ATP = Adenosine TriphosphateI use ATP to move
my muscles!
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What is the structure of ATP?
• 1 Adenosine molecule
• 1 Ribose molecule = 1 ATP
• 3 Phosphate molecules
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How does ATP drive cellular work?
• When a phosphate bond of an ATP molecule is broken, energy is released. The phosphate attaches to another molecule.
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What is the ATP Cycle?
ATP ADP ATP ADP ATP ADP