Think about the machine that rolled the flat waffle
sheets into cones:
1. If we changed the shape of the roller, would it
still work?
2. What requires less effort (energy), letting the
machine do the rolling or having people roll
each cone by hand?
3. What is faster, letting the machine do the
rolling or having people roll each cone by
hand?
4. Is the machine affected in any way each time it
rolls a cone?
5. We learned that when the cones cool down,
they harden. Would the machine still work if it
was put inside a freezer?
Enzymes
1B.1) SWBAT predict what will happen to an enzyme
catalyzed reaction when we change the temperature and
explain their reasoning
1B.2) SWBAT explain the effect of enzymes on energy of
activation, equilibrium, and the rate at which equilibrium
is attained
1B.3) SWBAT understand that the enzyme-substrate
interaction is very specific like a lock and key fit
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
What
is
a
catalyst?
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
What
is
a
catalyst?
A
catalyst
is
any
substance
that
can
affect
the
rate
(speed)
of
a
chemical
reaction.
A
catalyst
is
not
changed
or
used
up
during
the
reaction.
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
What
is
an
enzyme?
An
enzyme
is
a
catalyst
made
of
proteins.
Enzymes
can
affect
the
rate
chemical
reactions
in
living
things.
Enzymes
speed up
biochemical
reactions by
lowering the
activation energy
of reactions that
would normally
happen anyway.
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
How
do
enzymes
work?
 Enzymes
have
specific
shapes
that
influence
how
they
function
and
interact
with
other
molecules.
Enzyme
Molecule
The enzyme will function
better the more precisely it
fits with the molecule.
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
How
do
enzymes
work?
Enzyme
Enzymes can be
reused, so they can
work on multiple
molecules.
Molecule
Molecule
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
What
affects
how
enzymes
work?
 Shape
 Each
enzyme
has
a
specific
shape
to
work
correctly.
Anything
that
changes
that
shape
will
affect
how
the
enzyme
works.
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
What
affects
how
enzymes
work?
 Temperature
 Most
enzymes
have
an
optimum
(ideal)
temperature
where
they
work
the
best.
 Beyond
the
optimum
temperature,
the
enzyme
begins
to
change
shape
or
break
apart,
so
it
does
not
work
as
well
(or
at
all).
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
What
affects
how
enzymes
work?
LEARNING
OBJECTIVE:
We
will
learn
how
enzymes
affect
chemical
reactions.
What
affects
how
enzymes
work?
 pH
 pH
is
a
measure
of
whether
a
substance
is
acidic,
neutral,
or
basic
(0‐14)
 All
enzymes
have
an
optimal
pH
where
they
function
the
best.
 Many
enzymes
function
the
best
at
a
neutral
pH
(of
7),
although
there
are
exceptions.
Exit
Slip
1B.1) There are bacteria called thermophiles (they like heat). The record
for life growing at high temperatures is 235°F. Their enzymes have
evolved to function at these temperatures. Would their enzymes work if
you placed the bacteria in ice water?
1B.2) You can buy hydrogen peroxide in the pharmacy. Hydrogen
peroxide undergoes a chemical reaction to break down into water and
oxygen. If you pour it on your skin, nothing happens. If you pour it on a
cut, it starts bubbling right away (because oxygen is being produced).
What could have been released from your cells when you got a cut that
would speed up the reaction? How is the reaction sped up?
1B.3) Why can’t an enzyme that copies DNA also copy proteins?
http://www.divediscover.whoi.edu/hottopics/bacteria.html
Enzymes:
Fun
Facts

Enzymes
work
quickly—about
1000
substrates
are
taken
in
and
converted
every
second.