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Chapter 8
Microbial Metabolism
16
Microbiology
Undergraduate 1
03/01/2010

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Term
Active Site
Definition
the actual site where the substrate binds is a crevice or a grove. Also called the catalytic site
Term
Substrate
Definition
The reactant molecules that use enzymes as a catalyst
Term
Exoenzymes
Definition
After the initial synthesis of the holoenzyme, it is trasported outside of the cell where it proceeds to break down (hydrolyze) large food particles or harmful chemicals.
Term
Endoenzymes
Definition
These enzymes remain in the cell and perform their function there. Most enzymes on the metabolic pathway are of this variety.
Term
Constitutive enzymes
Definition
These are always present and in relatively constant amounts regardless of the amount of substrate.
Term
Regulated Enzymes
Definition
The production of these enzymes are either induced or repressed depending on the concentration of the substrate.
Term
Anabolic reactions
Definition
AKA: dehydration reactions. Require ATP to form covalent bonds between smaller molecules and release one water molecule for each bond made to synthesize larger molecules
Term
Catabolic reactions
Definition
AKA: hydrolysis reactions. Requires water to break down bonds to smaller molecules
Term
Oxidation
Definition
The loss of electrons
Term
Reduction
Definition
The gaining of electrons
Term
Exergonic reaction
Definition
Releases energy as it goes forward.
Term
Endergonic Reaction
Definition
They are driven forward by the addition of energy.
Term
Phosphorylate
Definition
add an inorganic phosphate
Term
NAD
Definition
Nicotinamide adenine dinucleotide; carrier of electrons and hydrogen during a redox reaction called dehydrogenation.
Term
ATP
Definition
adenosine triphosphate; consists of a nitrogen base (adenine), a 5 cardon sugar called ribose, and a chain of 3 phosphate groups.
Term
Oxidative phosphorylation
Definition
A series of redox reactions occuring during the final phase of the respiratory pathway giving ADP the phoshorus group it needs to become the all powerful ATP
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