1. Energy in a Cell

2. The Need for Energy
ATP is the molecule that stores energy for easy use within the cell.
ATP

3. ATP
ATP is formed when a phosphate group is added to ADP. When ATP is broken down, ADP and phosphate are formed and energy is released.

4. Green organisms trap the energy in the sunlight and store it in the bonds of certain molecules for later use.

5. Organisms that cannot use sunlight directly obtain energy by consuming plants or other organisms that have consumed plants.

6. Photosynthesis
The leaf is the primary site of photosynthesis in plants.
Is the process by which cells use light energy to make simple sugars.
Chlorophyll in the chloroplasts of plant cells trap light energy needed for photosynthesis.

8. The light reactions of photosynthesis produced ATP and result in the splitting of water molecules.

9. Calvin Cycle
The reactions of the Calvin cycle make carbohydrates using CO2 along with ATP and NADPH from the light reactions.

10. Cellular Respiration
In cellular respiration, cells break down carbohydrates to release energy.
In the first stage of cellular respiration, glycolysis, takes place in the cytoplasm and does not require oxygen.

11. Citric Acid Cycle takes place in mitochondria and requires oxygen.