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Making real science accessible and interesting for all people. Monday, March 5, Easy Enzyme Experiment: Potato Catalase Catalase enzyme formed the bubbles in the two tubes on the right. The tubes contain extracts from beef muscle, kidney, and liver from left to right. In a post awhile back we discussed the enzyme catalase and its presence in animal tissues such as liver, kidney, and muscle.
Catalase was and is found to be extremely abundant in the liver, a reflection of the livers cleansing function. It is also present, but much less so, in the kidneys, also a reflection cleansing function. Muscle tissue however had no detectable catalase due to the fact that it is not a cleansing organ, waste products from the muscles are rather filtered and cleaned by the liver and kidneys.
Catalase also has been found in plants, where its presence is often mysterious. Plants of course are not producing waste products similar to what animals produce, so why would they need catalase?
We can discover the answer partially by simply understanding the function of catalase. This is what catalase does in general: Metals rust as they react with oxygen and oxidative molecules cause rusting to occur.
This is why anti-oxidants are such a big deal, they prevent tissue from oxidizing by getting rid of oxidizing molecules such as hydrogen peroxide. Catalase is such an anti-oxidant molecule. Catalase also converts reactive oxygen, which also oxidizes, into hydrogen peroxide and then into harmless water and oxygen.
Of course I have simplified these reactions, so chemists, refrain from complaint!
At the end of a reaction catalase is preserved and available to repeat the reaction over again with more oxidative molecules. Amazingly, one catalase enzyme can repeat these reaction up to 40 million times in one second!
So the presence of catalase makes sense. Plants do not eat, so why would they need catalase? If we study the process of photosynthesis we may come across a term called photorespiration.
Photorespiration simply is when a plant receives too much light and not enough water. As a result, the plant can produce large amounts of hydrogen peroxide which can kill the plant.
Fortunatly, catalase prevents the accumulation of hydrogen peroxide by converting it to water and oxygen, and so saves the plant from oxidative damage. Some plants such as potato and spinach have very high levels of catalase, far higher they they would likely ever need to prevent photorespiration damage.
Why that is, no one seems to know. Scientists have had many ideas and have researched the question for almost years but no one can figure it out.
But it makes isolating the catalase enzyme very inexpensive and easy if you want to run a simple experiment. The following is a simple enzyme experiment anyone can run. Test tube or other small container Hydrogen Peroxide 1.
Cut up a potato and mash it. Place the mashed potato in a test tube or other small container. If there is catalase present foam should be produced. The foam produced is a result of catalase converting hydrogen peroxide into water and oxygen, the bubbles are filled with this oxygen.
The more bubbles produced the faster catalase is carrying out this reaction, or the more catalase present. The above would be considered the control for the experiment and simply indicated the presence of catalase in the potato.
Tests can be preformed to determine the effects of different conditions on the enzyme function.Factors that Affect the Rate of Reaction of Peroxidase Purpose: To determine the effect of various factors on the rate of reaction between an enzyme and its substrate, and also to determine the optimal ranges under which the enzyme activity is maximized.
Do you think you can make Alka-Seltzer fizz faster or more loudly by changing the temperature of the water? How big of a difference in the rate of a chemical reaction can temperature make? Objective. To measure the effect of temperature on the rate of a chemical reaction.
Major Events And Timeline Of Indo Pak History From Mohammad Bin Qasim To Creation Of Pakistan Necessary Notes of Pak studies FOR nts ppsc fpsc css pms and all tests. The effect of temperature on rates of reaction Aim: The aim of this experiment is to find out if the reaction rate of sodium thiosulphate solution and hydrochloric acid will be affected by a temperature change. Chapter 1: Matter—Solids, Liquids, and Gases. Students are introduced to the idea that matter is composed of atoms and molecules that .
- in my experiment, the time Alka Seltzer tablet uses to dissolve in water decreases as the water becomes hotter and increase as the temperature becomes lower.
Temperature affects the rate of chemical reaction; the higher temperature the reactants have, the higher the rate of chemical reaction will be; the lower temperature the reactants have, the lower the rate of chemical reaction will be.
Lab Report: How Temperature affects Reaction Rate Aim: The Aim is to investigate how temperature can affect Reaction Rate. The experiment will be performed by heating equally sized and weighted lime stones with equal amounts and concentration of Hydrochloric acid at different temperatures.
The temperatures will be 35˚C and 40˚C.
It is reasonable to think that temperature will affect the rate of other chemical reactions because temperature affected this reaction. Explore Ask students how they could set up an experiment to find out if the temperature of the reactants affects the speed of the reaction.
Mar 05, · In a post awhile back we discussed the enzyme catalase and its presence in animal tissues such as liver, kidney, and muscle.
Catalase was and is found to be extremely abundant in the liver, a reflection of the livers cleansing function.