2. CELLULAR ENERGY

3. All Cells Need Energy Cells need energy to do a variety of work: Making new molecules. Building membranes and organelles. Moving molecules in and out of the cell. (Maintaining homeostasis) Movement.

4. Where Does A Cell Get Energy? Food is broken down to a form the cell can use. Extra energy is stored in an ATP molecule, a nucleotide.

5. What Is ATP? ATP – adenosine triphosphate is a molecule made up of an adenine+ ribose, (adenosine), and 3 phosphate groups. Adenine Ribose

6. How Does ATP Work? Energy is stored in the bond between the second and third phosphate group. When the bond is broken, energy is released and ADP is formed. Adenine Ribose

7. ADP-ATP is a cycle

8. ATP – Energy Currency Within a cell, formation of ATP from ADP and phosphate occurs over and over, storing energy each time. As the cell uses energy, ATP breaks down repeatedly to release energy and form ADP and phosphate.

9. Storing Energy A + P  AMP adenosine + phosphate  adenosine monophosphate AMP + P  ADP adenosine monophosphate + phosphate  adenosine diphosphate ADP + P  ATP adenosine diphosphate + phosphate  adenosine triphosphate

10. Releasing Energy ATP  ADP + P + ENERGY adenosine triphosphate  adenosine diphosphate + phosphate+ energy

11. Making Energy Cells make energy in two ways: Photosynthesis – takes place in the chloroplasts. Respiration – takes place in the mitochondria.

12. ANNNDD… WE’RE DONE!! Napping again!