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Energy and Life Section 8-1 Energy and Life • Energy is the ability to do work. • All living things use energy stored in chemical compounds to survive. (FOOD) • Heterotrophs – eat food to get energy • Autotrophs – make their own food from sunlight and inorganic molecules to get energy. • When are you not using energy? Chemical Energy and ATP • Energy from food is changed into another form cells can use. • Adenosine Triphosphate (ATP) – energy molecule of the cell (made by what organelle?) • Must break down the foods to generate the ATP. • Breaking the bonds between the phosphate atoms will release the energy from ATP. • Used ATP is now ADP. (what is ADP?) • Energy stored in foods (glucose) will change ADP back into ATP. ATP Section 8-1 The ATP molecule! (Know this structure) Adenine Ribose 3 Phosphate groups Figure 8-3 Comparison of ADP and ATP to a Battery Section 8-1 ATP being made from ADP! ADP ATP Energy Adenosine diphosphate (ADP) + Phosphate Energy Adenosine triphosphate (ATP) Partially Fully charged charged battery battery This energy that will be stored into the ATP molecule which comes from food!