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Chapter 5 vocabulary
Chapter 5 is about cell metabolism
69
Microbiology
Professional
10/14/2013

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Term
Activation energy
Definition
The energy required to start a chemical reaction
Term
Active site
Definition
Area on the surface of an enzyme to which its substrate binds
Term
Aerobe
Definition
An organism that uses oxygen
Term
Aerobic respiration
Definition
Process in which aerobic organisms gain energy from the catabolism of organic molecules via the Krebs cycle and oxidative phosphorylation
Term
Alcoholic fermentation
Definition
Fermentation in which pyruvic acid is reduced to ethyl alcohol by electrons from reduced NAD (NADH)
Term
Allosteric site
Definition
The site at which a noncompetitive inhibitor binds
Term
Amphibolic pathway
Definition
A metabolic pathway that can yield either energy or building blocks for synthetic reactions
Term
Anabolic pathway
Definition
A chain of chemical reactions in which energy is used to synthesize biologically important molecules
Term
Anabolism
Definition
Chemical reactions in which energy is used to synthesize large molecules from simpler components (also called synthesis)
Term
Anaerobe
Definition
An organism that does not use oxygen, includes the organisms killed by exposure to oxygen
Term
Anaerobic respiration
Definition
Respiration in which the final electron acceptor in the electron transport chain is an inorganic molecule other than oxygen (i.e., a sulfate or nitrate)
Term
Apoenzyme
Definition
The protein portion of an enzyme that MUST combine with a nonprotein coenzyme or cofactor to form an active holoenzyme
Term
Autotrophs
Definition
Organisms that can get their carbon from inorganic sources and manufacture their own nutrition (self-feeding) via photosynthesis or inorganic chemicals
Term
Autotrophy
Definition
The classification of organisms that are able to obtain their nutrition and carbon via self-feeding methods (i.e. photosynthesis and from carbon dioxide)
Term
Beta oxidation
Definition
A metabolic pathway that breaks down fatty acids into 2-carbon pieces
Term
Catabolic pathway
Definition
A chain of chemical reactions that capture energy by breaking down large molecules into simpler components
Term
Catabolism
Definition
The chemical breakdown of molecules in which energy is released
Term
Chemical equilibrium
Definition
A steady state in which there is no net change in the concentrations of substrates or products
Term
Chemiosmosis
Definition
Term
Chemoautotroph
Definition
An autotroph that obtains energy by oxidizing simple inorganic substances such as sulfides and nitrites
Term
Chemoheterotroph
Definition
A heterotroph that obtains energy from breaking down ready made organic molecules
Term
Citric acid cycle
Definition
Term
Coenzyme
Definition
A nonprotein organic molecule bound to or loosely associated with an enzyme.  Many are synthesized from vitamins, essential nutrients that are required to make coenzymes
Term
Cofactor
Definition
Usually an inorganic ion that improve the fit of an enzyme with its substrate.  Examples include: magnesium, zinc, manganese.  They can be essential in allowing the reaction to proceed.
Term
Competitive inhibitor
Definition
A substrate-like molecule that can bind to the active site of an enzyme while making the enzyme unable to perform any of its actions
Term
Cyclic photophosphorylation
Definition
Term
Cytochrome
Definition
Term
Electron acceptor
Definition
AKA oxidizing agent because by accepting the electron it is causing another molecule to be oxidized, yet this causes the electron acceptor to be reduced.
Term
Electron donor
Definition
AKA reducing agent because when it gives up an election it's causing another molecule to be reduced while at the same time causing itself to be oxidized.
Term
Electron transport
Definition
Term
Electron transport chain
Definition
Term
Endoenzyme
Definition
Intracellular enzymes
Term
Enzyme
Definition

A special category of proteins found in all living organisms that act as catalysts to speed up biochemical reactions without raising body temperature to levels unconducive

 to life

Term
Enzyme-substrate complex
Definition
What forms when a substance collides with the active site of its specified enzyme.  This weakens the chemical bonds in the substrate.
Term
Exoenzyme
Definition
Extracellular enzymes are synthesized in the cell but cross the cell membrane to act in the periplasmic space or in the cell's immediate environment
Term
FAD
Definition
Term
Feedback inhibition
Definition
A reversible noncompetitive inhibition that regulates the rate of many metabolic pathways, i.e. when the end product of a pathway accumulates and then binds to and inactivates the enzyme that catalyzed the first reaction in the pathway.
Term
Fermentation
Definition
One process by which pyruvic acid is metabolized in the absence of oxygen.  It is the result of having to recycle limited amount of NAD by passing the electrons of reduced NAD off to other molecules. Two types: homolactic acid fermentation and alcoholic fermentation - does NOT capture energy in ATP from the metabolism of pyruvic acid
Term
Flavoprotein
Definition
Term
Glycolysis
Definition
glyco (sugar)-lysis(splitting) means to split the sugar.  Does NOT require oxygen but can take place in the presence of oxygen AKA the Embden-Meyerhof pathway is the metabolic pathway used by most autotrophic and heterotrophic organisms whether or not they are anaerobes or aerobic to break down glucose for energy
Term
Heterotrophy
Definition
"Other feeding" the use of carbon atoms from organic compounds for the synthesis of biomolecules
Term
Heterotrophy
Definition
Term
Holoenzyme
Definition
A functional enzyme consisting of an apoenzyme and a coenzyme or a cofactor
Term
Homolactic acid fermentation
Definition
Simplest pathway for pyruvic acid metabolism in which only lactic acid is made using electrons from reduced NAD.  Produces NO gas.  Some organisms that use this are used to make cheese
Term
Krebs cycle
Definition
Term
Light-dependent reactions
Definition
Term
Light-independent reactions
Definition
Term
Metabolic pathway
Definition
A series of chemical reactions in which the product of one reaction serves as a substrate for the next: A -> B -> C -> D -> E, and so on. A = initial substrate, E = final product, and B, C, and D are intermediates
Term
Metabolism
Definition
The sum of all the chemical processes carried out by living organisms
Term
NAD
Definition
Term
Noncompetitive inhibitor
Definition
Substances that can attach to the enzyme at its allosteric site thereby distorting the tertiary protein structure and alter the shape of the active site making the true substrate unable to attach to the enzyme and thereby inhibiting the enzyme
Term
Noncyclic photoreduction
Definition
Term
Oxidation
Definition
The loss or removal of an electron, yet oxygen need not be present if another electron acceptor is available
Term
Oxidative phosphorylation
Definition
Term
Permease
Definition
Term
Phosphorylation
Definition
The addition of a phosphate group to a molecule, often from ATP to increase the molecule's energy thus this serves as energy carriers in biochemical reactions
Term
Phosphotransferase system
Definition
Term
Photoautotroph
Definition
An autotroph that obtains energy from light
Term
Photoheterotroph
Definition
 A heterotroph that obtains energy from light
Term
Photolysis
Definition
Term
Photosynthesis
Definition
Term
Porin
Definition
Term
Quinone
Definition
Term
Reduction
Definition
The gain of electrons
Term
Redox reactions
Definition
Due to oxidation and reduction often occur simultaneously the reactions between them are called redox reactions
Term
Subtrate
Definition
The substance on which an enzyme acts in order to produce a chemical reaction so that a specific product may be produced
Term
Carrier molecule
Definition
Carry hydrogen atoms or electrons in many oxidative reactions
Term

Optimum temperature 

and

Optimum pH

Definition
The temperature and pH at which an enzyme functions at its best, meaning when it catalyzes a reaction most rapidly.  Changes in temperature or pH affect the enzyme activity (the rate at which an enzyme catalyzes a reaction)
Term
Four events of the glycolysis pathway
Definition

1. Substate-level phosphorylation

2. Breaking of a six-carbon molecule (glucose) into two three-carbon molecules

3. The transfer of two electrons to the coenzyme NAD

4. The capture of energy into ATP

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