Biology 1002B Lecture Notes - Lecture 4: Opsin, Signal Peptide, Hyperthermophile
9 Mar 2016
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Document Summary
Life and the two laws of thermodynamics. Law 1: energy can not be created or destroyed. Cell does a lot of converting of energy. Life transforms energy to do work light to chemical (oxidation of chlorophyll) light to change cis trans. Law 2:entropy of the universe always increases. Proteins break-down, mrna decays, complex molecules break down into simpler one. Energy is more concentrated in complex molecule. Thus they tend to break-down into more simple components over time. Counter this and maintain low entropy, cells bring in energy and raw material to build more cellular structures. Need food and energy to rebuild the molecules that have been broken down due to entropy. Living-beings increase the entropy of the universe by releasing heat and waste (co2) Dna and proteins are a highly ordered structure, we need to bring in energy and matter to maintain that structure (maintain low entropy). Energy that is available to be used to do work.
