1. CH 8 -PHOTOSYNTHESIS AND RESPIRATION
ENERGY NEEDS OF ORGANSIMS

2. All of the chemical reactions in a cell
8.1 ENERGY
Metabolism:
All of the chemical reactions in a cell

3. Photosynthesis—light energy from the Sun is converted to chemical energy (sugar) for use by the cell
Cellular respiration —organic molecules (glucose) are broken down into ATP that is then use by the cell as energy

4. How does this diagram relate to a rechargeable battery?
Chapter 8
Cellular Energy
8.1 How Organisms Obtain Energy
In Cellular respiration: ATP releases energy when the bonds are broken, forming a molecule called adenosine diphosphate (ADP) and a free phosphate group.
Cellular Respiration begins with the biochemical pathway called GLYCOLYSIS P P
How does this diagram relate to a rechargeable battery?

5. ORGANIC COMPOUNDS Glycolysis 2 ATP Aerobic respiration (with oxygen)
Krebs Cycle
Electron Transport
Anaerobic Respiration (w/o Oxygen)
*Fermentation
36 ATP

6. Cellular (Aerobic) Respiration
Cellular Energy
Cellular (Aerobic) Respiration
1. Glycolysis- Glucose is broken down yielding 2 ATP
The other products of gylcolysis can follow either of the two main pathways…..
2. Aerobic respiration – Krebs Cycle and Electron Transport Chain continue to break down carbon molecules to yield 36 ATP!!

7. Anaerobic Respiration (without oxygen)
Fermentation (anaerobic): does not produce ATP but instead produces NAD+ . This is then used to keep Glycolsis going.
In prokaryotic cells this occurs in the cytoplasm.
In eukaryotic cells this occurs in the mitochrondria

8. 8.2 Photosynthesis Photosynthesis occurs in two phases.
Cellular Energy
8.2 Photosynthesis
Photosynthesis occurs in two phases.
Light-dependent reactions
Light-independent reactions
Chloroplasts capture light energy which is locked up in the bonds of the glucose molecule

9. Phase 1 : Light dependent Reactions
The absorption of light is the first step in photosynthesis.
Chloroplasts capture light energy.
Phase 2 : Light –Independent Reactions(Calvin Cycle)
In the second phase of photosynthesis, called The Calvin Cycle.
-The Calvin cycle works steadily, producing energy-rich organic molecules (like glucose) and removing carbon dioxide from the atmosphere.

10. Carbon dioxide from atmosphere
Products of the Calvin Cycle

11. The equation for cellular respiration is the opposite of the equation for photosynthesis