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Enzymes
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Created by
Ane Pohl
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Cards (30)
What is
metabolism
?
All the
chemical
processes that occur within a living
organism
to maintain life.
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What is
catabolism
?
The breakdown of
larger
molecules into
smaller
ones.
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What is
anabolism
?
The buildup of
larger
molecules from
smaller
molecules.
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Why are catalysts important in chemical reactions?
They
speed up
the rate of chemical reactions, preventing them from being too
slow.
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What is a
catalyst
?
A substance capable of
speeding up
the rate of a chemical
reaction
and is unchanged by the reaction.
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What are enzymes?
Proteins that function as biological
catalysts
to
increase
the rate of chemical reactions.
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How do enzymes affect chemical reactions?
They
increase
the rate at which chemical reactions occur without being
changed
at the end of the reaction.
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What are the properties of enzymes?
They are
proteins
(macromolecules).
They are biological
catalysts
that
increase
the rate of a reaction.
They are specific; only molecules with a
complementary
shape can fit into the enzyme (lock and key model).
They are affected by
temperature
and
pH.
They are required in
small
amounts.
They are
reusable.
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What is the active site of an enzyme?
The
'dent'
on the enzyme which is exactly the correct shape for the
substrate
to fit into.
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What happens if a molecule does not fit into the enzyme's active site?
No
reaction
will occur.
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What is the enzyme-substrate complex (ESC)?
The
substrate bonds
with the enzyme's active site, forming an
enzyme-substrate complex.
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What are the products of the enzyme trypsin acting on polypeptides?
Amino acids.
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What does sucrase act on and what are its products?
It acts on sucrose to produce
glucose
and
fructose.
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What does maltase act on and what are its products?
It acts on maltose to produce
glucose
and
glucose.
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What does lipase act on and what are its products?
It acts on
lipids
(fats and oils) to produce
fatty acids
and glycerol.
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What does pepsin act on and what are its products?
It acts on
proteins
to produce
polypeptides.
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What does amylase act on and what are its products?
It acts on
starch
to produce
maltose.
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What does
lactase
act on and what are its products?
It acts on lactose to produce
galactose
and
glucose.
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What does catalase act on and what are its products?
It acts on hydrogen peroxide to produce oxygen and water.
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What factors influence the rate of chemical reactions?
Temperature
pH
(amount of free
hydrogen
ions in a solution)
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What is the optimum temperature for an enzyme?
The temperature at which the rate of enzyme activity is
greatest.
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How does temperature affect enzyme activity?
As temperature
increases
, the rate of enzyme activity also
increases
until an optimum temperature is reached.
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What happens to enzyme activity at higher temperatures?
Too much kinetic energy can cause the enzyme to
vibrate
too much, breaking
bonds
and changing the structure of the enzyme.
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What is denaturation in enzymes?
It is a permanent change where the enzyme's
active site
changes shape, preventing
substrate
binding.
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What happens to enzyme activity at lower temperatures?
The rate of enzyme activity is very
slow
, and enzymes become
inactive
at very low temperatures.
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What is the effect of pH on enzyme activity?
Each enzyme has a
pH
at which the rate of reaction is greatest, known as the
optimum
pH.
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What happens to enzymes at extreme pH levels?
Extreme pH levels can
denature
enzymes
irreversibly.
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What is the optimum pH for amylase?
pH 7 to 7.5, where it digests
starch
into
maltose.
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What is the optimum pH for pepsin?
pH 2 to 3, where it digests
proteins
into
polypeptides.
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What is the optimum pH for lipase?
pH 9, where it digests
lipids
into glycerol and
fatty
acids.
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