01:119:115 Lecture Notes - Lecture 18: Hydrolysis, Atp Hydrolysis, Cytoskeleton
25 Feb 2016
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Document Summary
Sum of all the chemical reactions and e transformations in an organism. An emergent property of life-> due to orderly interactions between molecules. Begins with a specific molecule, ends with a product. Pe- stored e, the capacity to do work. E cannot be created nor destroyed, only converted from one to another, principle of conservation of e. Heat- disorganized e, ke of randomly moving particles disperses into. Every e transfer or transformation increases entropy in the universe. Food- organized e- e stored in bonds low s, usable. Heat- disorganized e, ke of randomly moving particles disperses into environment high s, not usable. Total e in universe is constant but s increases over time so e available to do work decreases. Light e enters system--> stored as chemical e. Cell- 40% efficient, rest is lost to heat. Ultimate source of e for living systems: sunlight. Enthalpy (h)- total bond e in a system= total pe.
