Energy Flow in Cells, Ch. 6, 2007

Energy Flow in Cells, Ch. 6, 2007 - Energy in the Life of a...

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Energy in the Life of a Cell What IS energy ? What do all of the following statements have in common? “We have a serious energy crisis.” “I don’t have the energy to get out of bed.” “I just had a cup of coffee, and I feel energized .” “It takes a lot of energy to be a full-time student and also hold down a job at the same time.”
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A funky video about energy conversions: http://video.google.com/videoplay?docid=3163263343187879320&hl=en
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Definition of energy Energy is the ability to do work. Sounds pretty simple, huh? Energy exists in two forms: energy that is expressed ( kinetic energy ) and stored energy (known as potential energy ).
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Forms of kinetic energy: Electrical energy Light energy Movement of objects Heat energy (molecular movement)
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Potential energy also exists in a variety of forms: Energy due to height Energy stored in chemical bonds Electrical energy stored in a battery Elastic energy stored in springs or other stretched or compressed objects
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Potential energy can be transformed to kinetic energy (and vice versa):
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Some VERY important concepts: One form of energy can be transformed to another form of energy. However, energy cannot be changed to matter, nor can matter be changed to energy.* This may be confusing to you, but it is very important. Matter can STORE energy (in chemical bonds, for example). And energy can be used to power chemical reactions and change one kind of matter to another. *except in nuclear reactions, which do not occur in living organisms and thus do not concern us as biologists!
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First Law of Thermodynamics (The Law of Conservation of Energy): Energy can neither be created nor destroyed, although it can change form. In the photograph below, some of the chemical (potential) energy of the food will be converted to the kinetic energy of the cheetah’s movement. Enter away
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This note was uploaded on 04/09/2008 for the course BIOLOGY 101 taught by Professor Beitch during the Fall '07 term at Quinnipiac.

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Energy Flow in Cells, Ch. 6, 2007 - Energy in the Life of a...

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