Biology 1002B Lecture Notes - Lecture 4: Exergonic Reaction, Exothermic Reaction, Photoisomerization

• School: Western University
• Department: Biology
• Course: Biology 1002B
• Professor: Tom Haffie

Document Summary

First law: example: total energy of universe stays constant. Open systems in cells, cellular work can be done. Amino acids make protein through work or simple sugar to make complex sugar. Second law: the entropy of a system will always increase, energy spreading. Proteins breaking down and mrna decaying displaying entropy: complex molecules break down into simpler ones, energy is more concentrated in complex molecules. Low entropy in cells is maintained by bringing in matter and energy. To maintain low entropy (proteins and cells breaking down) so must get energy to maintain the low entropy and continue building cellular structures. How much energy in atp or glucose is able to actually do work. G free energy: products reactants (+) endergonic, ( ) exergonic. S entropy: (+) more spread out, ( ) less spread out. Reactions tend to be spontaneous (- g) when the reaction can occur without the input of energy.