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Terms in this set (14)
A catalyst is a substance that speeds up the rate
of a chemical reaction but is not itself changed by
Enzymes act as biological catalysts
They occur inside cells or are secreted by
Catalase is the enzyme that catalyses the
break down of hydrogen peroxide.
Enzymes are proteins
They are long polypeptide chains folded into 3
The arrangement of the shapes is precise and
gives each enzyme the ability to catalyse one
The part of an enzyme where the reaction
occurs is known as the
The molecule the enzyme acts on is known
The molecule the enzyme produces is known
The enzyme can be
Each enzyme is specific to one substrate molecule
or type of molecule
LOCK AND KEY HYPOTHESIS
Substrate and Active Site match each
other in two ways
The 3-D structure of the active site is specific to the
substrate. Substrate?s that don?t fit , won?t react.
Substrates that are not chemically attracted to the
active site won?t be able to react.
Under this hypothesis, each enzyme can only
affect one reaction
What are Enzymes used for ?
In order for any metabolic reaction to
occur, the reactant has to reach an
unstable, high-energy state.
This transition requires an input of energy
called the ACTIVATION
How Enzymes work?
When a substrate binds to the active
site, it pulls on the substrate.
By pulling on the molecule, it stretches
When the bonds are stressed, they
become easier to break.
Hence the energy need to move it to the
transition state is less i.e. ACTIVATION
ENERGY IS LOWERED.
Less energy = less time needed for
reaction to occur.
Enzymes are globular proteins.
As a result if their shape is changed, then
the active site is altered and then enzyme
cannot properly function.
Denaturation is defined as the changing of
the structure of a protein so that it cannot
carry out its function.
The activity and shape of enzymes is also
affected by pH.
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