1. Energy

2. 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

3. 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

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

6. Coupled Reactions

7. 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

8. ATP

10. 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?