BIOL 101 Chapter 6: Study Notes at South Carolina

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9 Jan 2019
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Chapter 6: Making Life Work: Capturing and Using Energy
Requirements of the Cell
o A way to encode/transmit info
Central Dogma
o A membrane separating inside from out
Plasma Membrane
o ENERGY!
Adenosine Triphosphate (ATP)
o The bonds linking these phosphate groups have high potential energy
o Everything uses ATP as its main component for energy
Metabolic Classification
Metabolism
o The totality of an organism’s chemical reactions
o Metabolism manages the material and energy resources of the cell
Metabolic Pathway
o A series of chemical reactions that either builds a complex molecule or breaks
down a complex molecule
o Each step is usually catalyzed by an enzyme
o A (starting molecule)enzyme 1/reaction1Benzyme 2/reaction
2Cenzyme 3/reaction 3D
Catabolism & Anabolism
o Anabolism
Taking subunits (monomers) and building them up into long chains or
macromolecules
ATP-Phosphate=ATP
ANAbolism- the N is joining together the two A’s= synthesis of molecules
o Catabolism
Breaking down macromolecules into monomer
ADP + Phosphate=ATP
“Cannibals” eat each other=breakdown molecules
Forms of Energy
o High Potential Energy
o Kinetic Energy
o Low Potential Energy
Why is ATP the currency of energy?
First Law of Thermodynamics
o Energy can be transferred and transformed, but cannot be created or destroyed
Principle of Conservation of Energy
Second Law of Thermodynamics
o Every energy transfer of transformation increases the entropy of the universe
Entropy-the measure of disorder or randomness
Gibbs Free Energy (DeltaG)
o Free energy is lower in the reactants than the products: positive Delta G
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