1. Photosynthesis and Cellular Respiration

2. Two ways to get food “troph” = food Autotrophs Heterotrophs
Auto = self
Autotrophs make their own food
Heterotrophs
Hetero = different
Heterotrophs get their food from something else (they have to eat it)

3. Two ways to get food
Autotrophs
Plants
Heterotrophs
Animals

4. Photosynthesis

5. Photosynthesis
Converts the sun’s energy into chemical energy stored in sugar
Takes place in specialized structures inside plant cells called chloroplasts
Chlorophyll is the pigment that absorbs sunlight.

6. Photosynthesis Reaction
6CO2 + 6 H2O + light
energy → C6H12O6 + 6O2
The food plants make is called glucose (sugar)

7. Photosynthesis 2 different reactions Light Reactions Calvin Cycle
Uses sunlight & water to make oxygen, ATP, and NADPH
Calvin Cycle
Uses ATP, NADPH, & carbon dioxide to make Glucose

10. In which organelle do plants make glucose?
Do Now
In which organelle do plants make glucose?

11. Cellular Respiration
Cells
Breathing

12. Cellular Respiration Happens in both plant and animal cells
Overall Reaction:
C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

13. Cellular Respiration Overview
Depends on whether or not there is oxygen
Aero = oxygen
Aerobic Respiration – uses oxygen
Anaerobic Respiration – does not use oxygen

15. Step 1: Glycolysis Anaerobic Respiration- no Oxygen
This is done in ALL cells
Glycolysis happens in the cytoplasm of the cell
Glycolysis makes 2 molecules of ATP (energy)

16. Step 3 without oxygen: Fermentation
The cell must recycle the materials from glycolysis.
This recycling process is called fermentation.
The product of fermentation is alcohol or lactic acid.

18. Step 3 with oxygen: Cellular Respiration
Oxygen required=aerobic
2 more sets of reactions which occur the cell’s mitochondria
1. Kreb’s Cycle – makes 2 ATP
Also called the Citric Acid Cycle
2. Electron Transport Chain – makes ATP

20. Energy Tally 36 ATP for aerobic vs. 2 ATP for anaerobic
Glycolysis ATP
Kreb’s ATP
Electron Transport 32 ATP
36 ATP
Anaerobic organisms can’t be too energetic but are important for global recycling of carbon