Photosynthesis
Chapter 8 in the Textbook
Chemical Energy and ATP
• What type of organic macromolecule is
shown in the diagram?
• The in the diagram label the following:
– Phosphate groups
– Sugar
– Nitrogenous Base
Chemical Energy and ATP
ATP (adenosine triphosphate) is the most important
molecule cells use to store and release energy
Energy: the ability to do work
Energy comes in many different forms:
• Light energy
• Mechanical Energy
• Chemical Energy
Chemical Energy and ATP
• When an organism uses the energy from ATP, the ATP is
converted into ADP
– ADP (Adenosine Diphosphate ) has only 2 phosphate groups.
– Cells can add a phosphate to ADP to make ATP to store
energy. (This requires energy)
– Where do YOUR cells get
the energy to convert
ADP into ATP?
– How is ATP and ADP
similar to rechargeable
batteries?
Chemical Energy and ATP
The mitochondria and the chloroplast are the most
important organelles in energy transformations.
• Chloroplast
– Uses the energy in sunlight to create glucose
– Found in the cells of plants and protists
• Mitochondria
– Uses the energy in
glucose to convert ADP
into ATP
– Found in the cells of all
eukaroytic organisms
(including plants!!!)