1 Review What is ATP and what is its role in the cell” Explain How does the structure of ATP make it an ideal source of energy for the cell Use Analogies Explain how ADP and ATP are each like a battery. Which one is partially charged and which one is fully charged- why? 2 Review What is the ultimate source of energy for plants Explain How do heterotrophs obtain energy? How is this different from autotrophs? 3 Interdependence Recall that energy flows and nutrient cycles through the biosphere. How does the process of photosynthesis impact both the flow of energy and the cycling of nutrients?

Ch 8 Photosynthesis 8.1 Energy and Life

Chemical Energy Energy The ability to do work Your cells are always working- building, contracting, transporting If you can’t get and use energy you die.

ATP Adenosine TriPhosphate Small usable packet of energy Your body/cells use whenever they need energy for various functions High Energy.

ADP Adenosine DiPhosphate Two phosphate molecules Used up version of ATP Low energy Can be turned back into ATP by adding a phosphate and energy to hook it back on.

Storing Energy Cells store small amounts of energy by adding a phosphate to ADP Cells release small amounts of energy by removing the third phosphate of ATP ATP and ADP are like a rechargeable batteries.

Using Biochemical Energy

Storing Energy ATP isn’t good at long term energy storage Only small amounts are kept ATP can be regenerated by using energy in glucose.

Heterotrophs Autotrophs Photosynthesis Obtain food by consuming other living things Autotrophs Organisms that make their own food Photosynthesis Process of autotrophs of converting light energy into chemical energy.