The Effect of Temperature on the Activity of the Enzyme Catalase


Length: 1594 words (4.6 double-spaced pages)
Rating: Excellent
Open Document
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Text Preview

More ↓

Continue reading...

Open Document

The Effect of Temperature on the Activity of the Enzyme Catalase


Introduction:

The catalase is added to hydrogen peroxide (H²0²), a vigorous reaction
occurs and oxygen gas is evolved. This experiment investigates the
effect of temperature on the rate at which the enzyme works by
measuring the amount of oxygen evolved over a period of time.

The experiment was carried out varying the temperature and recording
the results. It was then repeated but we removed the catalase (potato)
and added Lead Nitrate in its place, we again tested this experiment
at two different temperatures and recorded the results.

Once all the experiments were calculated, comparisons against two
other groups were recorded. With this information we were able to
identify any patterns and similarities.

Hypothesis:

The higher the temperature of water, potato and H²O², the rate at
which the Enzyme will work will be faster therefore producing more
oxygen.

The reaction will be the same without the catalase (potato). Therefore
in both experiments the Enzyme will work more rapidly and produce more
oxygen.

Aim:

To test the hypothesis.

Method:

[IMAGE]

Equipment needed:

Ruler

Measuring Cylinder

Scalpel

Tongs

Pipette

Thermometer

Tri-pod

Stop-clock

Gauze

Delivery Tube

Bunsen Burner

Beaker

Matches/Lighter

Potato

Hydrogen Peroxide Solution (20%)

Water

Lead Nitrate

The skin of the potato was removed using a scalpel and then cut into
1cm², using a ruler to measure the size of each cube, four cubes are
required for each experiment, and therefore at least 36 cubes are
required for the full experiment to take place. Fill a beaker half way
with water, and place a thermometer in the water. Allow the
thermometer to warm to room temperature to gather an accurate reading,
and measure the temperature, using the thermometer. A measuring
cylinder was used to put 10ml of Hydrogen Peroxide Solution into a

How to Cite this Page

MLA Citation:
"The Effect of Temperature on the Activity of the Enzyme Catalase." 123HelpMe.com. 17 Oct 2017
    <http://www.123HelpMe.com/view.asp?id=121328>.
Title Length Color Rating  
The Effect of Temperature on the Rate of Enzyme Activity Essay examples - ... The first way is by helping the substrates to bind together. It is easier for substrates to react if they are closer together, thus bringing on the transition state. The second way is by repositioning them. Substrates do not travel in a particular direction and so if they are repositioned so that they collide, they will react. Another way to cause reactions is using an induced-fit model. This means that the enzyme changes its shape to better fit the substrate and make for a stronger bond. Finally stopping water molecules from getting through and disrupting the reactions will help binding occur....   [tags: biochemical analysis] 565 words
(1.6 pages)
Strong Essays [preview]
Essay on The Effect of Temperature on the Activity of the Enzyme Catalase - The Effect of Temperature on the Activity of the Enzyme Catalase Introduction: The catalase is added to hydrogen peroxide (H²0²), a vigorous reaction occurs and oxygen gas is evolved. This experiment investigates the effect of temperature on the rate at which the enzyme works by measuring the amount of oxygen evolved over a period of time. The experiment was carried out varying the temperature and recording the results. It was then repeated but we removed the catalase (potato) and added Lead Nitrate in its place, we again tested this experiment at two different temperatures and recorded the results....   [tags: Papers] 1594 words
(4.6 pages)
Strong Essays [preview]
Investigation to Determine the Effect of Temperature on the Activity of the Enzyme Amylase - Investigation to Determine the Effect of Temperature on the Activity of the Enzyme Amylase I am trying to find out if changing temperatures affects the activity of enzymes. The Input variable I will test is temperature; the range I will use for this is 0-80°C. The out come variable to be measured is the speed of the reaction. Hypothesis I believe that at a higher temperature the enzyme will react quicker, but at a certain temperature the enzyme it will stop working. I think this because enzymes work well at higher temperatures because particles have more energy resulting in more successful collisions between them and a quicker reaction....   [tags: Papers] 616 words
(1.8 pages)
Strong Essays [preview]
Effect of Substrate Concentration on Enzyme Activity Essay - ... Carefully connect them as shown in the diagram. (Picture 1.2) Add 5mL of the yeast suspension into the boiling tubes. Take out the 1mL plastic syringe and fill it with various concentrations of hydrogen peroxide (H2O2) starting from 1mL to 10mLand then also fulfill the rest of the capacity of the syringe with water. Put the syringe on into the needle and inject the solution quickly, but very carefully into the boiling tube. (Picture 1.3) As the solution is injected into the boiling tube, time it with a timer for 30s to see the volume of oxygen released into the long graduated tube....   [tags: reaction, experiment, plateau ] 1204 words
(3.4 pages)
Better Essays [preview]
The Effect of Temperature on the Action of Peroxidase Enzyme Essay - The Effect of Temperature on the Action of Peroxidase Enzyme Aim To find the effect of temperature on an enzyme in this case peroxidase, by studying it decomposing hydrogen peroxide. Planning I am measuring the amount of gas given off in the reaction. By collecting this figure I can determine the rate of reaction. If I know the rate of reaction I can find out what temperature peroxidase works best at. Equipment · Trough · Clamp · 100ml measuring cylinder · Stop clock · 10ml measuring cylinder · Delivery tubes · Bung · Conical flask Variables Change The temperature of the reactants: 60 50 40 30 20...   [tags: Papers] 779 words
(2.2 pages)
Strong Essays [preview]
The Effect of pH on the Activity of the Enzyme Amylase Essay - The Effect of pH on the Activity of the Enzyme Amylase Aim :- To find the effect of pH on the activity of the enzyme amylase. An enzyme is a type of protein found in all living cells. Enzymes act as biological catalysts, breaking down substrates without needing a high temperature, allowing all the chemical reactions of metabolism to take place, regulating the speed at which they progress, lowering the activation energy and providing a means of controlling individual biochemical pathways....   [tags: Papers] 1088 words
(3.1 pages)
Strong Essays [preview]
The Effect of Temperature on the Activity of Rennin in Milk Essay - The Effect of Temperature on the Activity of Rennin in Milk Aim: To find out what effect different temperatures have on the enzyme, rennin, in milk. Introduction An enzyme is a biological catalyst. It speeds up a reaction by lowering the activation energy required to start the reaction. It speeds up a reaction, but remains unchanged unless certain limiting factors are introduced. It is composed of polymers of amino acids. An enzyme has an optimum pH and temperature. When an enzyme is at its optimum conditions, the rate of reaction is the fastest....   [tags: Papers] 3329 words
(9.5 pages)
Strong Essays [preview]
The Effect of Substrate Concentration on the Rate of Activity of the Enzyme Catalase - The Effect of Substrate Concentration on the Rate of Activity of the Enzyme Catalase Background Information: Enzymes are biological catalysts that increase the speed of chemical reactions without undergoing any physical change. They are neither used up in the reaction nor do they appear as reaction products. All enzyme catalysed reactions are reversible. Enzymes effectively lower the amount of activation energy required for chemical reactions to start. Some enzymes weaken covalent bonds within the substrate molecule, whereas in other cases this lowering of the activation energy seems to take place because the enzyme holds the substrate molecules in a particular p...   [tags: Papers] 3145 words
(9 pages)
Powerful Essays [preview]
Essay about Investigating Enzyme Activity - Investigating Enzyme Activity Aim: To investigate how the concentration of hydrogen peroxide effects the rate of reaction of an enzyme (catalase) Variables: These factors could effect the rate of reaction on an enzyme: · pH · Concentration · Temperature · Surface Area pH - Enzymes function at different pH values. In neutral conditions the amount of oxygen gas given of in an enzyme-catalysed reaction will increase. An enzyme is affected by how much acid or alkali is present....   [tags: Papers] 3981 words
(11.4 pages)
Powerful Essays [preview]
Enzyme Essay examples - The plot of enzyme activity Vs. pH is often "bell shaped" since two different amino acid groups of the enzyme are being titrated to different states of ionization at the different pH values. This means that only one of the two possible ionization states of the amino acid side chain is effective in enzyme catalysis - in other words, if an acidic side chain like Glu is involved in catalysis, it probably only works when it is ionized; since Glu side chain carboxylic acid groups have a pK around pH 5, at pH values below this pK, the enzyme will be less active; while at pH values above the pK, the enzyme will be most active....   [tags: essays research papers] 1727 words
(4.9 pages)
Strong Essays [preview]

Related Searches




test tube, and then four potato cubes were placed into the test tube.
The mouth of the test tube was plugged with a delivery tube; the other
end of the delivery tube was placed in another test tube that was
filled with water. The stop-clock was set for one minute. The test
tube that's filled with water was observed, the number of oxygen
bubbles that are released in one minute were counted. Calculations
were noted before moving onto the next experiment. Each new experiment
that is taken place, ensure a new test tubes, new potato, fresh new
H²O² solution and fresh new water is used. A Bunsen Burner was lit
with matches; the beaker of water was placed on top of the gauze,
which was on top of the tri-pod, above the Bunsen burner, heat the
water, the thermometer was placed in the beaker. The temperature was
noted for each experiment. The experiment continued with the water at
different temperatures e.g. 25°, 35°, 45°, 50° and 60°. The results
were recorded indicating the number of oxygen bubbles released at each
different temperature.

The experiment was repeated at two different temperatures e.g. 20° and
32°, following the above guidelines, a pipette was used to add five
drops of Lead Nitrate to the mixture. Both results were recorded.

The experiment was repeated again, at two different temperatures e.g.
20° and 32°, following the above guidelines, removing the potato
(enzyme - catalase), and adding five drops of Lead Nitrate. Both
results were recorded.

Results:

The following table indicates the results and calculations of our
experiments. (Table 1).

Temperature of Water °C

Number of Oxygen Bubbles Released in 60 seconds: (Potato & H²O²)

25

36

35

0

35

27

45

58

50

84

60

0

Table 1:

This experiment was noted from three different groups and a comparison
was made. As noted in the table below. (Table 2).

Temperature of Water °C

Number of Oxygen Bubbles Released in 60 seconds: (Potato(4 x 1cm²) &
H²O²(10ml)) - Our Results:

Comparison 2

Potato (5.37grams)& H²O² (10ml)

Comparison 3

Potato (1 x 1cm²)& H²O²(5cm³)

5

-

-

2

12

-

-

7

17

-

-

3

20

-

15

25

36

-

8

31

-

-

12

32

-

56

35

0

-

35

27

-

39

-

-

11

41

-

86

45

58

-

46

-

-

9

50

84

-

52

-

86

53

-

-

8

60

0

82

61

-

-

1

72

-

92

Table 2

By looking at the graph (see Diagram 1, attached), you will see that
different temperatures were used, as well as different volumes of
potato (enzyme - catalase) and H²O². This gave a completely varied
result, but indicated that the higher the temperature, the higher the
amount of oxygen bubbles were released. It also indicated that the
more potato (enzyme - catalase) that was used, the faster the
reaction.

Temperature of Water °C

Number of Oxygen Bubbles Released in 60 seconds: (Potato, H²O² & Lead
Nitrate)

Number of Oxygen Bubbles Released in 60 seconds: (H²O² & Lead Nitrate)

20

45

-

-

0

-

-

22

-

-

4

-

-

-

25

-

36

-

-

0

-

31

-

-

6

-

-

0

32

34

-

-

-

-

-

34

-

67

-

0

-

-

Table 3

The above table (Table3) demonstrates the different reactions that
occurred when the experiment was repeated with Lead Nitrate, and then
again with Lead Nitrate but without the potato. Each column represents
the findings of the three groups; the first group is our own results.

Conclusion:

This would conclude that my hypothesis for the first experiment
(potato, hydrogen peroxide) was supported by the experiment. This was
indicated by the number of oxygen bubbles that were released. Showing
that at the temperature of 50° eighty-four bubbles were released,
proving that the higher the temperature the faster the reaction of the
catalase.

However, my conclusion on the experiment where the potato was removed
and lead nitrate added, it clearly showed that there was no reaction
at all. This was demonstrated by my results as well as the two
comparisons I made.

Analysis and Discussion:

Enzymes are globular proteins, which are polymers of amino acids. They
range in size from 1 x 104 daltons to 1 x 106 daltons with the
majority being in the 105 range. Some enzymes have extra molecules
other than amino acids, which assist in the reaction they carry out.
The protein portion of an enzyme is called the apoenzyme. The
non-protein part of an enzyme is called a cofactor. Cofactors can be
loosely bound; coenzymes are tightly bound, into prosthetic groups.
The complete enzyme (apoprotein + cofactor) is called the holoenzyme.

Enzymes are proteins that catalyze (speed up) chemical reactions.
Enzymes increase reaction rates by a factor of about 1 million (ref:
Marieb, Elaine N). They do this by lowering the activation energy
needed to get a reaction to go forward. All enzymes are specific to
single chemical reactions or a small group of related reactions. Each
specific enzyme determines which reaction will occur and be speeded
up, this means that unwanted chemicals or reactions are reduced.

The results of my experiment indicate that at the temperature of 35°
the reaction was the slowest with only twenty-seven oxygen bubbles
being released; whereas at the temperature of 50° the reaction was the
highest at eighty-four oxygen bubbles being released. This indicated
that the higher the temperature the faster the reaction. This
experiment was carried out various times by different groups, and it
indicated that the amount of catalase (potato) was a significant
factor on how slow or quick the reaction, the more potato the quicker
the reaction.

The results could vary very much, depending on the amount of potato
and H²O² that was used; this is proving in my comparisons'. Showing
that the group that used the least amount of potato (1 x 1cm²) and the
least amount of H²O² (5cm³) got the lowest reaction. Improvement could
be made by ensuring that every experiment that is carried out uses the
exact amount of H²O² and the same amount of potato. This would clearly
give a more accurate reading.

I would suggest that in future experiments 4 x 1cm² of potato, 10ml of
H²O², and temperatures at 20°, 30°, 40°, 50° and 60° are tested.
Therefore all results would be more accurate and a better comparison
could be made.

Additional Information:

Catalase is one of the most potent catalysts known. The reactions it
catalyses are crucial to life. Catalase catalyses conversion of
Hydrogen Peroxide; a powerful and potentially harmful oxidizing agent
to water and molecular oxygen. Catalase also uses Hydrogen Peroxide to
oxidise toxins including Phenols, Formic Acid, Formaldehyde and
Alcohols.

Catalase like all enzymes has an optimum temperature and pH at which
it works best. This may differ according to the source of the catalase
- catalase from liver could have a higher optimum temperature than
catalase from potato. Experiments can be done to find out the optimum
for your catalase. The pH optimum of potato catalase is pH 7.6.

[IMAGE]

The pH is the measure of the acidity or alkalinity of a solution. An
acidic solution has many hydrogen ions (H+) and a pH below 7. An
alkaline, or basic, solution has very few hydrogen ions and a pH above
7. A neutral solution has a pH of 7.

An enzyme that is found in the cells of many living tissues is
catalase it speeds up a reaction which breaks down hydrogen peroxide,
a toxic chemical, into 2 harmless substances - water and oxygen. The
reaction is as follows:

2H2O2 ----> 2H2O + O2

This reaction is important to cells because hydrogen peroxide (H2O2)
is produced as a result of many normal cellular reactions. If the
cells don't break down the hydrogen peroxide, then they would be
poisonous and die.

There are three essential steps in the participation of the mechanism
of enzyme action:

[IMAGE]

1. The enzyme must attach itself to the substance(s) on which it
works. These substances are called the substrates of the enzyme.
Substrates attach to a particular part of the enzyme's surface; this
is called the active site. This is very much like a jigsaw puzzle, and
particular substrates attach and fit into the enzymes. This is called
enzyme recognition.

2. Internal rearrangement of the enzyme substrate forms the product.

3. The enzyme releases the product, showing the catalytic role of the
enzyme.

The process then continues again and again with the "free" enzyme to
locate its matching substrate(s). Enzymes can be found in every organ
of the body. For example, they can change starches, proteins, and
sugars into substances the body can digest. Blood clotting is an
example of enzymes at work. Enzymes exist in the mouth (saliva),
stomach (gastric juice), and intestines (pancreatic juice, intestinal
juice, and intestinal mucosa).

I believe the results I obtained showed precisely the higher the
temperature the quicker the reaction, but when the catalase is removed
no reaction occurs.

Reference:

Author:

Title:

Publisher:

Date of Publication:

www.bact.wisc.edu/microtextbook/dalton

2003

Marieb, Elaine N

Human Anatomy & Physiology, 3rd Edition

Holyoke Community College

1993

Wancke, J. H Christopher

Chemicals of Life

2003

Guyton, M. D Arthur

Basic Human Physiology: Normal Function & Mechanisms of Disease

Saunders

1977

www.biologylab.co. Stephen Fuller


CATALASE
Observing an enzyme

Kansas City, Missouri School

2003



Return to 123HelpMe.com