Exam 3 Flashcards
Why are enzymes necessary for cells?
They catalyze a number of chemical reactions that are necessary for cell function
True or False: many chemical bonds in cells reversible.
True
Breaking a chemical bond requires the ______ of energy.
Input
Reactions with positive ^G require an input of energy and are _________.
Endergonic
Reactions with negative ^G release energy and are _________.
Exergonic
Adenosine Triphosphate(ATP) stores ________ in a form that cells can use to perform work.
Energy
The __________ __ ____ is spontaneous and produces _____ _______ that can be used to drive other reactions.
Hydrolysis of ATP
Free Energy
What type of reaction occurs when the net free energy is negative?
Coupled reactions
Where do enzymes bind substrates?
The active site
__________ turn on enzymes when their products are needed and the reactants are present.
Activators
_________ turn off enzymes when their products are not needed.
Inhibitors
Reversible inhibitors form:
weak bonds with the enzyme
Irreversible inhibitors form:
covalent bonds with the enzyme
Enzyme active sites are specific for the ________ and the ____ __ _____ that is catalyzed.
Substrate
Type of reaction
Allosteric regulators bind where?
Outside the active site
