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ATP AND WORK Energy ● We need energy to do work. ● Energy comes from food. ● All energy in food comes from the sun. Energy ● Autotrophs: make their own food ○ ex) plants, some bacteria and protists ● Heterotrophs: eat food for energy Energy Adenosine Triphosphate ● Energy can be stored in chemical bonds ● Adenosine Triphosphate (ATP)- main source of energy storage in living things Adenosine Triphosphate Parts: ● adenine (nitrogen base) ● ribose (5-carbon sugar) ● 3 phosphate groups Adenosine Triphosphate Releasing Energy: ● bond between the last 2 phosphate groups is broken ● ATP ADP + Pi + ENERGY Adenosine Triphosphate Storing Energy: ● Adenosine diphosphate (ADP) can bond with a phosphate to make ATP and store energy ● ADP + Pi + ENERGY ATP Adenosine Triphosphate Adenosine Triphosphate Uses: ● ● ● ● active transport protein synthesis muscle contractions many more Adenosine Triphosphate ● Cells only have a few seconds worth of ATP ○ ATP must be continually made ● More efficient to store energy in sugar ○ One glucose has 90x more energy than one ATP