Energy

=Energy= **The Role of ATP's (Adenosine Triphosphate) -** ATP's have many uses in the cell which include transport work like moving substances across cell membrane. ATP's are also used for mechanical work like supplying the energy needed for muscle contractions, blood circulation, and body movement. Another role that ATP's play are supplying the energy needed to synthesize all the different types of macromolecules that a cell needs to exist. ATP's are also used as an on and off switch to control chemical reactions and send messages. **Enzymes** - Enzymes are catalysts that lower the activation energy for a reaction. Most enzymes are proteins and have three dimensional shapes, which are determined by the amino acid sequence and the genes. By lowering the activation energy, enzymes allow a larger proportion of the reactants to participate in the reaction.



reactions release energy into the environment and endothermic absorbs energy from the environment. The two types of energy in reactions are kinetic and potential. Kinetic energy is working currently and it is the active form of energy and potential energy is stored energy that has the potential to do work.
 * Reactions -** Energy is a very important part in reactions. Depending on which is greater, energy is either released or absorbed from the surroundings. Exothermic

Animation of Reactions http://www.atomicarchive.com/Movies/Movie1.shtml

Exothermic reaction between iron oxide and aluminum metal power to form iron metal and aluminum oxide|Exothermic reaction video between iron oxide and aluminum metal power to form iron metal and aluminum oxide http://www.ilpi.com/genchem/demo/thermite/index.html

Works Cited Bergman, Jerry. "ATP: The Perfect Energy Currency for the Cell." (Online) Available http://www.trueorigin.org/atp.asp 26 January 2009. Farabee, Michael. "Reactions and Enzymes." (Online) Available http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookEnzym.html 27 January 2009. "Nuclear Chain Reaction Animation." (Onine) Available http://www.atomicarchive.com/Movies/Movie1.shtml 27 January 2009. "The Thermite Reaction." (Onine) Available http://www.ilpi.com/genchem/demo/thermite/index.html 27 January 2009.