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test one
ch 5
16
Biology
Undergraduate 2
09/10/2009

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Term
first law of thermodynamics
Definition
energy in the universe is constant
Term
second law of thermodynamics
Definition
energy conversions increase the disorder of the universe
Term
exergonic reaction
Definition
a chemical reaction that releases energy in covalent bonds if the reactants
Term
Endergonic reaction
Definition
requires an input of energy and yields products rich in potential energy
Term
the cell does ____ types of celluar work
Definition
3
Term
chemical work
Definition
driving endergonic reactions
Term
transport work
Definition
pumping substances across membranes
Term
Mechanical work
Definition
beating of cilia
Term
enzymes
Definition
proteins that function as biological catalyst
Term
how enzymes work
Definition
speed up the rate of reaction by lowering the Ea, and are not used up in the process
Term
active site
Definition
place where enzyme interacts with the enzymes substrate; this results because of an enzymes shape
Term
competitive inhibitors
Definition
chemicals that compete for the enzymes active site and thus block substrates from entering the active site
Term
cofactors
Definition
nonprotein helpers for enzymes that are inorganic such as zinc iron and coppor
Term
coenzynes
Definition
organic molecule helpers for enzymes that are often vitamins
Term
noncompetitive inhibitors
Definition
do not act directly with the active site of an enzyme
Term
feedback inhibition
Definition
when the product of a metabolic pathway can serve as an inhibitor in the pathway
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