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Metabolism Energy and Enzymes
Ch 6
40
Biology
Post-Graduate
02/13/2013

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Term

Energy

Definition

Ability to do work or bring about change

Term
Kinetic Energy
Definition
Energy of Motion
Term
Potential Energy
Definition
Stored Energy
Term
First Law of Thermodynamics
Definition
States energy cannot be created or destroyed but it can be changed from one form to the next
Term
Second Law of Thermodynamics
Definition
states that energy cannot from one form to the next without the loss of usable energy
Term
Entropy
Definition
used to indicate the relative amount of disorganization
Term
Kilocalories
Definition
measurement of energy times 1000
Term
Metabolism
Definition
sum of all the chemical reactions that occur in the cell.
Term
Anabolism
Definition
a type of metabolism that builds up
Term
Catabolism
Definition
a type of metabolism that breaks down
Term
Chemical Energy
Definition
contains energy in the chemical bonds of molecules
Term
Mechanical Energy
Definition
type of kinetic energy formed from chemical energy
Term
Free Energy
Definition
the amount of energy available that is still free to do work after a chemical reaction has occurred
Term
Biosynthesis
Definition
an anabolic type of metabolic pathway that is also endergonic that forms a polysacchride carbohydrate from glucose
Term
Photosynthesis
Definition
an anabolic type of metabolic pathway that take sun light and turns it into usable energy it is also endergonic and produces glucose.
Term
Digestion
Definition
a catabolic type of metabolic pathway that is exergonic that breaks down polysacchride carbohydrates in glucose
Term
Respiration
Definition
a catabolic metabolic pathway that is also exergonic and breaks glucose down into ATP and carbon dioxide and water
Term
Exergonic
Definition
Energy is Released
Term
Endergonic
Definition
requires an input of energy
Term
Reactants
Definition
Substances that participate in a reaction
Term
Substrates
Definition
reactants in an enzymatic reaction
Term
Products
Definition
Substances that form as a result of reactions
Term
Enzymes
Definition
A protein that functions to speed up chemical reactions. It is a catalyst.
Term
Energy of Activation
Definition
requires an input of energy that cause molecules to react with one another. Enzymes lower the amount of energy of activation for a faster reaction
Term
Denaturation
Definition
When the enzyme has lost its second and tertiary structures causing the enzyme to change shape
Term
Induced Fit Model
Definition
the Enzyme is induced to undergo a slight change to achieve optimum fit.
Term
Active Site
Definition
complexes with a small area where the enzyme and substrate fit together like a key in a lock
Term
Substrate Concentration
Definition
As enzyme activity increases a substrate concentration also increases but when the enzymes active sites are filled the enzymes activity cannot increase anymore
Term
Effect of Temperature on Enzymatic Action
Definition
as temperature rises enzyme activity increases however once it rises past a certain point enzyme activity eventually levels out and then declines rapidly.
Term
Effect of Change of pH on Enzymatic Action
Definition
a change in pH can alter ionization and disrupt normal interactions and denaturation occurs.
Term
Inhibition
Definition
Occurs when a substrate is unable to bind to the active site of an enzyme
Term
Irreversible Inhibition
Definition
Denatured and will not come back
Term
Reversible Inhibition
Definition
Just turned off for a short time and the ability to bind again will occur
Term
Holoenzyme
Definition
Complete Enzyme
Term
Apoenzyme
Definition
Protein part of the Enzyme
Term
Cofactor
Definition
Help create enzyme.
Term
Coenzyme
Definition
organic nonprotein molecules such as vitamins that help form an enzyme.
Term
Oxidation
Definition
OIL of electrons (Loss of electrons)
Term
Reduction
Definition
RIG of electrons (Gain of electrons)
Term
A+C=H
Definition
Apoenzyme+(Cofactor or Coenzyme)= Holoenzyme
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