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Chapter 26

BIOL 110 Chapter Notes - Chapter 26: Exergonic Reaction, Kinetic Energy, Thermodynamics

Course Code
BIOL 110
Denise Woodward

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Tutorial 26
Saturday, November 19, 2016
9:37 PM
Energy I - Thermodynamics
Metabolism and Energy
All of the chemical reactions that occur in an organism
Anabolic - result in the formation of polymers/large molecules
Catabolic - results in the breakdown of molecules
Photoautotrophs, chemoheterotrophs
The capacity for doing work
Kinetic energy- energy that is associated with moving matter
Temperature is a reflection of the KE of its atoms or molecules
Fast molecules = high KE = high T
Potential energy- energy that is stored
Energy and chemical bonds
o Bond formation produces heat
Laws of thermodynamics: the first law
o When glucose is broken down, there is a release of energy
The physics of energy transformations that occur in a
collection of matter
Any collection of matter is a system
Organism is a system, essentially
o The first law of thermodynamics
Energy is neither created nor destroyed
Energy in the universe is constant
Plats do’t ake eergy - they convert it
Laws of thermodynamics: The second law
o All energy-affected matter in the universe is becoming random
o In other words, entropy is increasing in the universe
o Entropy- measure of disorder
o All matter tends toward disorder, but systems can become ordered (less entropic) with
o Systems can become ordered as long as they are "open" to the universe
o Life channels energy thermodynamically to create order
For life forms on earth, the SUN
o T and entropy (S)
Entropic state of a given system is proportional to T
At absolute 0, the entropic state of any system is 0
Free energy embodies the first and second laws
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