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Enzymes
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terezia b
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Active
site
The part of the enzyme where the
biochemical
reaction takes place
Polypeptide
chains
Form
orderly
shapes (secondary structure)
Held in shape by
hydrogen
bonds between the
-NH
of one peptide link and the -C-O of another amino acid
Secondary
structures
α-helix
β-pleated
sheet
Tertiary
structure
The secondary structures fold into
three
dimensional shapes to make the
tertiary
structure
The tertiary structure
gives the enzyme its specific
shape
Enzyme catalysis
The reaction takes place on the
active site
of the enzyme
The active site consists of a small number of
amino acids
, which form a specific
shape
because of the secondary and tertiary structure
Enzymes work specifically to
catalyse
one type of
biochemical
reaction
During a biochemical reaction,
substrates
are converted into
products
Active
site
The part of the enzyme where the
chemical
reaction takes place
Active
site
Consists of a small number of
amino acids
Forms a
specific
shape
Enzyme
catalysis
1.
Substrate
binds to
active
site
2.
Reaction
takes place on
active
site
3.
Product
is
released
4.
Active
site available for further
reactions
Substrate
The molecule that
binds
to the
active
site of the enzyme
Substrate
Has a
complementary shape
to the active site of the enzyme
Enzymes work specifically to
catalyse
one type of
biochemical
reaction
Biochemical
reaction
Substrates are
converted
into
products
The
active site
is a specific shape that only the
substrate
will fit
If
temperature goes too high (above 40°C)
Hydrogen
bonds
break
Enzyme changes
shape
Active site
loses
its
shape
Enzyme is denatured and can no longer act as a
catalyst
In your own words, describe the
lock
and key mechanism of enzyme action.: 'The active site is a specific shape that only the
substrate
will
fit.'