Energy & Life

1. Energy & Life Objectives: Contrast autotrophs & heterotrophs. Describe the structure and function of ATP. Define photosynthesis. Write the equation for photosynthesis.

2. When you’re finished • Read and take notes on section 8-1 

3. Where do you get your energy from? • Heterotrophs – organisms that get energy from foods they eat. Examples: Animals, Fungi • Autotrophs – organisms that make their own food. Examples: Plants

4. QUIZ TIME: HETEROTROPH OR AUTOTROPH?

5. Energy comes in many forms!!!

6. Chemical Energy • Energy can also be stored in chemicals!

7. Living Things Use Chemical Energy Too!!!`` • Adenosine triphosphate (ATP) – the chemical compound that cells use to store and release energy. ENERGY!!! P P P Adenine 3 Phosphate Groups Ribose

8. How to Get Energy from ATP!! BREAK THE BOND! ENERGY!!! ENERGY!!! X P P P Phosphate Groups Adenine Adenosine diphosphate (ADP) Adenosine triphosphate (ATP) Ribose

9. QUIZ TIME!! • What is the difference between ATP and ADP? ATP = 3 phosphate groups ADP = 2 phosphate groups

10. What do Cells use ATP for? Cells can use ATP for: • Active transport • Making proteins • Making DNA • Responding to stimuli

11. How much ATP do you think Cells have Stored? ONLY A SMALL AMOUNT!! ATP can only store small amounts of energy, so organisms only keep a small amount of ATP ready. To get more ATP when needed, we use energy from foods (like glucose) to turn more ADP into ATP. P P P

12. Photosynthesis: Making Glucose • Photosynthesis – process that uses sunlight to convert water and carbon dioxide into sugars and oxygen. CO2 + H2O ------- > C6H12O6 + O2 Carbon dioxide + water  sugars + oxygen

13. Photosynthesis: What’s Missing? CO2 +___  C6H12O6 + O2 H2O (water)

14. Now What’s Missing? CO2 + H2O  ____ + O2 C6H12O6 (sugar)