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AP Biology: Chapter 8
An Intro Into Metabolism
31
Biology
11th Grade
02/12/2009

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Term
Metabolism
Definition
Chemical reactions within an organism
Term
Metabolic Pathway
Definition
Begins with a specific molecule and ends with a product
Term
Catabolic Pathway
Definition
Breakdown: Release energy
Term
Anabolic Pathway
Definition
Build up: Consume energy
Term
Energy
Definition
Capacity to cause change
Term
Kinetic Energy
Definition
Motion that is released in a chemical reaction
Term
Potential Energy
Definition
Energy that matter possesses because of its location or structure
Term
Heat
Definition
Kinetic energy associated with random movements
Term
Thermodynamics
Definition
Study of transformations
Term
Closed System
Definition
Isolated from surroundings
Term
Open System
Definition
Energy can be transferred between system and surroundings
Term
First Law of Thermodynamics
Definition
-Energy cannot be created or destroyed
-Energy can be transferred and transformed
Term
Second Law of Thermodynamics
Definition
Every transformation or transfer increases entropy in the universe
Term
Free Energy
Definition
(+)Free energy means the reaction was not spontaneous
(-)Free energy means the reaction was spontaneous
Term
Entropy
Definition
Disorder
Term
Enthalpy
Definition
Quotient or description of thermodynamic potential
Term
Exergonic Reaction
Definition
Net release of free energy and is spontaneous
Term
Endergonic Reaction
Definition
Absorbs free energy from its surroundings and is not spontaneous
Term
ATP
Definition
Adenosine Triphosphate (energy that your body uses)
Term
Energy Coupling
Definition
Exergonic & Endergonic reactions
Term
Hydrolysis
Definition
The addition of water to break down a substance
Term
Enzyme
Definition
Catalytic protein
Term
Catalyst
Definition
Speeds up a reaction without being consumed
Term
Activation Energy
Definition
Initial amount of energy needed to start a chemical reaction
Term
Substrate
Definition
Reactant an enzyme acts on
Term
Active Site
Definition
Region on the enzyme where the substrate binds
Term
Induced Fit
Definition
Brings chemical groups of the active site into positions that enhance their ability to catalyze the chemical reaction
Term
Cofactors
Definition
Non-protein enzyme helpers
Term
Coenzymes
Definition
Organic cofactors
Term
Enzyme Inhibitors
Definition
Bind to the active site of an enzyme competing with the substrate
Term
Feedback Inhibition
Definition
End product of a metabolic pathway shuts down the pathway by binding to the enzyme that acts early in the pathway
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