Energy.

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Presentation transcript:

Energy

What is energy? Energy is the capacity to do work (movement) Potential energy is stored energy (chemical bonds) Kinetic energy is movement (light, heat, electricity) Law of conservation of energy: energy can not be created nor destroyed, only transferred Transfer of energy is rarely 100%, some energy is turned to heat

Energy in the ecosystem The ultimate source of energy is the sun Energy transfer from one trophic level to another is 10% Sun  autotrophs  heterotrophs

How does energy flow in chemical reactions? Chemical reactions make or break chemical bonds Reactants  products Exergonic: releases energy Endergonic: absorbs energy

Coupled Reactions

How is energy transported within cells? Breaking down glucose uses the energy stored in the chemical bonds Energy-carrier molecules – high energy molecules that capture the released energy Examples: ATP – Adenosine triphosphate NADPH – nicotinamide adenine dinucleotide

ATP

Checkpoint #1 and HW Why is energy important to living organisms? ATP is the energy molecule of the cell, even though glucose is the source. Create an analogy to explain this. Why is it useful to pair endergonic and exergonic reactions?

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