AbstractThis investigation is a study on the distribution of vary cite in different whole shebang tissue papers. I looked at 7 different tissues and mea sealedd the summate of type O tote upicted morose to conceive the quantity of change state leave. I found vary tissues to apply vary issue forths acquaint. IntroductionCatalase is a widespread enzyme, found in nearly all aerobiotic cellular ph genius(a)s (animals, im full treatments and microbes). It protects the cell from the toxic do of henry peroxide, generated as a waste by-product of cell metabolism. It does this by catalysing the decomposition of atomic number 1 peroxide (a powerful and potentially stabbing oxidizing agent) into molecular atomic number 8 and water. The reaction reasoned deal be summarised by the equation:2H 0 2H 0 + 0Different localise materials check very different amounts of catalase occupation and this is what I provide be looking at. Catalase is located in a cell ce ll organelle called the peroxi near. Peroxisomes in plant cells be involved in photorespiration (the subr let onine of oxygen and production of ampere-second dioxide) and symbiotic newton retroersion (the breaking apart of the northward touch to reactive nitrogen atoms). atomic number 1 peroxide is produced during these chemical processes and must be distant to pr veritable(a)t damage to cellular structures. If hydrogen peroxide is added to tissue containing the enzyme turn bubbles ar produced, this is evidence of oxygen production and confirms that at that place was change state present. Catalase has one of the highest turnover rates for all enzymes: one molecule of catalase can convert 6 million molecules of hydrogen peroxide to water and oxygen all(prenominal) minute. AimsTo investigate the amount of catalyse in varying plant tissuesHypothesisThe more than a plant is respiring, the high the catalyse activity and the more oxygen draw off out be produced. Var iablesThere argon m both variables, which co! uld affect my results these are:?Temperature- the higher the temperature, the higher the rate of reaction up to a certain point. Whilst the optimum temperature of catalyse is probably higher than style temperature, about 20 degree Celsius, I shall and carry on my gustatory perception reacting at room temperature which is about 22 degrees Celsius. ?Surface area-the bigger the surface area the quicker the reaction for protrude exercise as the hydrogen peroxide reacts with the catalyse. I shall over get on with this by clipting all the tissues into 3 mm cubes. ?Time-I give leave the audition for 5 minutes in install to give ample time for the reaction to occur. ?The engrossment of Hydrogen Peroxide-In govern to make the try out a degenerate evidence I shall put on 10 gaudiness of the hydrogen peroxide. ? inwardness of tissue-the amount of tissue will table service determine the amount of catalyse that will be present, which in turn will affect the amount of oxy gen given off. In invest to keep the fair test I will use the same weights (3grams) from each one time. SafetyWhen running(a) with the hydrogen peroxide I harbor to be super careful as it can cause burns to flake or clothing as it is a corrosive. I will adopt to make sure that if I spill each or get each on me I swoosh it off using smoke of water and if severe assay medical attention. When working with it I shall use eye security system and gloves. PilotIn assemble to make sure my equipment and examine works I am going to examination it. The tissues I shall use will be:?Apple? white white potato vine? carrot?TurnipApparatusI will be using:?A 1 cm syringe?Glass pitch shot furnish? stop remain?Boiling thermionic thermionic valve?Clamp?Litre beaker?Inverted metal drum of a 20 cm syringe?Chopping board? bray?Weighing scalesMy rule is slackly adding hydrogen to different plant tissues which whitethorn or may not contain varying amounts of catalyse, I will measure the amount of catalyse present by the amount ! of oxygen produced. Below you can reassure a diagram of how it was set up. Pilot Method1)Prepare all tissues by chopping them up into 1cm³ squares and weighing them out to weigh 3grams. I heady on 3 grams as it wasn?t too unretentive to get a reaction and wasn?t too frequently for the hydrogen peroxide to react with. 2)Set up my apparatus as delegaten in diagram above, using clamps to support the boiling tube and the rubber tubing attached to the place of the 20 cm³ syringe. 3)Remove the 1cm³ plastic syringes, and hencely remove the bung from the boiling tube. 4)Insert 3 grams of the tissue into the boiling tube and replace the bung. 5)Open the screw verify to draw water into the barrel of the 20cm³ syringe, close the clip when the barrel is full. 6)Draw up 1cm of hydrogen peroxide into the syringe and indeed cut in it into the boiling tube. 7)Depress the plunger of the 1cm³ syringe to inject the hydrogen peroxide solution into the boiling tube. 8)Start the st opwatch, measure and record the intensity level of oxygen collected in the barrel of the 20cm³ syringe over a period of five minutes. Pilot resultsTissueAmount of oxygen produced (ml)Apple0Potato1Carrot0Turnip0Due to my voyage experiment not working as well as I had planned and hoped, I make up make some changes to the method and have added more varying tissues. I refractory that I would use:?Developing Bluebell?New suppuration leaves?Germinating free beansI decided to do this so that I would get results of tissues that should be respiring a lot. I also decided that in order to increase the surface area of the tissues I would expire it up in a blender. In order to belittle boastful chucks I had to add 10ml of water to make a solution, this then took the large chucks off the outside of the blender and thus made them get caught up in the blades, thereby pulping the be chucks of tissues completely. I did this for all of my tissues and mixed it for about 20 seconds each. As I got no reaction I decided to add more hydrogen pero! xide, I increased it from 1cm to 2 cm .
In order to try and keep the test tube with catalyse in it reacting at room temperature I hardened it in a water bath. This will help keep it a fair test and will stop whatsoever fluctuations in room temperature affecting my results. Everything else about the pilot experiment I did the same. Results123456AveragePotato1110998109.5Carrot10547656.1Bluebells5645475.1Beans4568475.6Apple0010000.16Leafs2531242.8Turnip3455654.6AnalysisWith reference to my graph above, I can listen that generally most plant tissues contain some catalyse, unless orchard apple tree seems to show sign s of having none or very little and potato having the most. Storage organs much(prenominal)(prenominal) as the potato are high in catalase activity as proven by my experiment as they gave off the most oxygen gas. similarly the tissues which are respiring a lot such as the germinating beans and bluebell buds are high. My results are fairly holy as they have been in a lab controlled part as so all variables are managed and so should be more accurate. My results show to me the apple does not have any catalyse activity present in its tissues; this means no respiration is occurring receivable to the plant not having to protect itself from the hurtful effects of hydrogen peroxide. ConclusionCatalyse activity is most present in tissues which are respiring rapidly such as new plant tissue or tissues which are being held as shop such as the potato. My experiment has proven that certain plant tissues do have more catalyse activity then others. EvaluationMy accuracy of my investigati on has to be criticised to analyze. I think there we! re a friction match of line of works with my results. Firstly there may have been errors in my equipment such as the bung and test tube may have been not tightly fitted enough and so my results would produce a domineering error producing the same biased result each time but it would have still been a fair test. The experiment produced me the exact measurements I requisiteed and generally I produced the results that I was expecting. There were errors in my experiment the main one was how enough oxygen had to be produced in order to even get a result as the oxygen had to be sufficient to travel round the delivery tube and into the up turned syringe, this would be a problem on tissues with a small amount of catalyse activity as I would think it didn?t react at all referable to no oxygen reaching the upside-down syringe, however on all the tissues that did react a systematic error would be produced as it would take the same amount of oxygen each time to reach the syringe. Overall I think my investigation was successful as I turn out my hypothesis to be correct and I got overall the results I would have predicted. BibliographyEncyclopaedia Britannicawww.catalase.com/catalinks.htm If you want to get a full essay, order it on our website:
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