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Chapter 5 - Chapter 5 Energy Flow in the Life of a Cell...

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Chapter 5: Energy Flow in the Life of a Cell Phenylketonuria (PKU)  o Discovered in 1934 by Asbjorn Folling o Cannot fully digest the amino acid phenylalanine and it builds up in the  blood to a toxic level to developing nervous systems What is energy? The capacity to do work Two types: o Potential stored energy in the form of  Chemical bonds Positional energy o Kinetic energy of movement Light—movement of photons Heat—movement of molecules Electricity—movement of electrically charged particles Movement of large objects Laws of thermodynamics: Energy cannot be created nor destroyed but can be transformed into a different  kind of energy (conservation of energy) When energy is converted into another form, the amount in a useful form is  decreased (conversion is not 100% efficient) o Converted from more useful to less useful forms o Processes that proceed spontaneously lead to increasing randomness  and disorder (entrophy) When energy is converted into another form, the new form is less organized than  the original form (entropy increases) The original source of energy for life on Earth
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