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Energy in a Cell - Understanding ATP, Photosynthesis, and Cellular Respiration

Explore the importance of ATP, photosynthesis, and cellular respiration in storing and releasing energy within cells. Learn how organisms harness sunlight, produce sugars, and break down carbohydrates to sustain life processes.

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Energy in a Cell - Understanding ATP, Photosynthesis, and Cellular Respiration

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  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 • 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. The leaf is the primary site of photosynthesis in plants.

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

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

  9. 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.

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

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