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Catalase gcse coursework



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build essay fire - Jan 24,  · This website and its content is subject to our Terms and Conditions. Tes Global Ltd is registered in England (Company No ) with its registered office at 26 Red Lion Square London WC1R 4HQ. (Original post by lilixxx) Hi guys, I was wondering if anyone could help me out with my bio coursework? Originally my experiment was going to be adding hydrogen peroxide to pieces of liver from different animals (e.g. pig, sheep, cow) as a way of measuring catalase activity. Apr 30,  · Catalase is an enzyme which is found in most living organisms. It catalyses the decomposition of hydrogen peroxide into water and oxygen. 2H 2 O 2 + Catalase >>> 2H 2 O + O 2 Catalase dramatically reduces the activation energy needed for the reaction. ap biology essay 2010 rubric

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aspects of contract and business law essays - What are the best conditions for catalase enzyme? What happens when an enzyme or living tissue is put in hydrogen peroxide? Find out in this video. Rates of Reaction. What is a Catalyst?. A catalyst is a substance that will change the rate of a reaction. A catalyst is often used to make a reaction go faster.. The catalyst does not take part in the reaction as a reactant. It is not changed by the reaction or used up during the reaction. It is still there in the same form when the reaction is complete.. A catalyst can be a transition metal. Miss Nichol shows you how to do the catalase rates of reaction coursework. malcolm x pilgrimage mecca essay

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role beauty therapist essay - Category, GCSE Chemistry Coursework Investigation, Title, Effect of temperature on rate of reaction Effect Of temperature On Rate Of Reaction Factors. Extracts from this document Introduction The Effect of pH on Catalase Hypothesis, The rate at which catalase catalyses the decomposition of hydrogen peroxide/5(). Dec 10,  · Catalase example tables. pptx, KB. Investigating Catalase. About this resource. Info. Created: Dec 10, xlsx, 12 KB. Catalase example tables. pptx, KB. Investigating Catalase. Report a problem. This resource is designed for UK teachers. NEW AQA GCSE Biology - 'Homeostasis' lessons. Activity of the enzyme, catalase [which catalyzes the reaction 2H 2 O 2 (l) → 2H 2 O (l) + O 2 (g)], is then studied using a simple assay for O 2. To conduct the assay, a filter is soaked in crude potato extract, then transferred to the bottom of a beaker containing hydrogen peroxide. can you use the same college essay twice

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essay on greek river - Besides, the enzyme catalase is known to be one of the enzymes that possess a high turnover number. Its turnover number can be up to whereby one molecule of enzyme catalase can catalyse the decomposition of molecules of hydrogen peroxide to oxygen and water at body temperature. AQA A-level Biology Autumn Exam Paper 1,2,3 12/16/20 Oct - Exam Discussion Stonebridge Access to Nursing - Unit 5 Cell Biology. Catalase, an enzyme that brings about (catalyzes) the reaction by which hydrogen peroxide is decomposed to water and bellavistagovpy.gearhostpreview.com extensively in organisms that live in the presence of oxygen, catalase prevents the accumulation of and protects cellular organelles and tissues from damage by peroxide, which is continuously produced by numerous metabolic reactions. recommendation letter for college application

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scott paper towel research - thank goodness. i thought i was the only one here doing AS coursework on enzymes. i am really stuck as my coursework is on the effect of the inhibitor ammonia on enzyme catalase in liver. I need to know if ANY one else has done a coursework like this as i am completely stuck. If you have please let me use it as a guide. A Customer Service Essay: the Art Coursework On Catalase of Writing. Properly accessing a customer service essay will help you in understanding the essentials needed in creating a college paper that will offer a great result. Read more. How to . Revise for your A-levels & GCSEs from latest past papers, revision notes, marking schemes & get answers to your questions on revision, exams or student life on our forums. essay prize competition

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causal analysis essay topics - Mar 09,  · Anthony Matthews from Fort Wayne was looking for catalase coursework Nickolas Lee found the answer to a search query catalase coursework write my paper catalase coursework catalase coursework a level catalase enzyme coursework catalase gcse coursework catalase hydrogen peroxide coursework catalase hydrogen peroxide experiment coursework. GCSE Coursework. Extracts from this document Introduction The Effect of pH on Catalase Hypothesis, The rate at which catalase catalyses the decomposition of hydrogen peroxide. GCSE, Resources - Teach PE GCSE. A secondary school revision resource for GCSE Maths about foundation and higher level data handling. Similarly jul 17, economics papers will help assist with us. Gcse. Catalase coursework. I am going to eat and essay on autism enough information. Too raw and low quality essay. G. Using sample responses grade. Mar 24, simple essay and a student essay site: poorly written, he or lack of your topic, ethics vs. R register/formality. Thescrewjack. oded maron thesis

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andalou essay - Catalase is said to be a common enzyme which is found almost in all living organisms that are exposed to oxygen. For example: animals, fruits or vegetables. Catalase catalyzes the. 4 Catalase Liver and yeast are used to decompose hydrogen peroxide Catalase Discussion Catalase - preparation All zipped. 5 Effect of enzyme concentration Increasing strengths of urease are used to produce ammonia from urea. Effect of enzyme concentration Discussion Discussion - answers. Effect of temperature, substrate concentration and pH on reaction rate. The rate of an enzyme-catalysed reaction is calculated by measuring the rate . art and the bible two essays

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mfa design thesis - Catalase is an enzyme that converts hydrogen peroxide into water and oxygen gas. Enzymes are protein molecules that are composed of subunits called amino acids. GCSE science specifications. By carrying out carefully considered practical work, students will enhance their investigative thinking, improve their mastery of techniques and consolidate their understanding of key scientific concepts. The assessment of practical skills is changing, so we are creating documents to help you and your. Different cells build different types of catalase. Many are available for study in the PDB. The catalase that protects our red blood cells, shown on the left from PDB entry 1qqw, is composed of four identical subunits and uses a heme/iron group to perform the bellavistagovpy.gearhostpreview.com bacteria scavenge hydrogen peroxide with a larger catalase, shown in the center from PDB entry 1iph, . mla papers research style

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aqa gcse english coursework original writing - According to the structure and sequence, catalases can be divided into three classes (Fig. ): monofunc­tional catalase or typical catalase, catalase-peroxidase, and pseudocatalase or Mn-catalasee (Zhang et al., ). Out staff of freelance writers includes over experts proficient in -GCSE Coursework-Hydrogen Peroxide Experiment, therefore you can rest assured that your assignment will be handled by only top rated specialists. Order your -GCSE Coursework-Hydrogen Peroxide Experiment paper at affordable prices with bellavistagovpy.gearhostpreview.com! PLANNING METHOD 1. Catalase works to speed up the decomposition of hydrogen peroxide into oxygen and water. We will also test how this process is affected by changes in the temperature of the potato. Is the process faster or slower when compared to the control experiment conducted at . cover letter for hr internship resume

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antithesis boat - The Effect of pH on Catalase GCSE Science Marked by. Catalase Wikipedia. Experiment the effect of pH on catalase activity. Catalase in potatoes Science and Plants for Schools. MAY 4TH, - I M DOING MY BIOLOGY COURSEWORK ON POTATO CATALASE AND DID MY EXPERIMENT TODAY MY EXPERIMENTS SHOWED THAT THE OPTIMUM PH FOR POTATO CATALASE . GCSE. Edexcel. Enzymes. Enzymes are biological catalysts which speed up reactions. They are specific for their substrate. The lock and key hypothesis models . José Marín-García M.D., in Post-Genomic Cardiology (Second Edition), Catalase. CAT is a tetrameric enzyme, which promotes the reduction of H 2 O 2 to H 2 O and O 2 (Figure B).Mammalian CAT is exclusively located in the peroxisomes and utilizes H 2 O 2 generated during fatty acid oxidation (FAO) in these organelles. Treatment of cells with H 2 O 2 activates . mother sacrifices essay

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essay technology in education - View Catalase Research Papers on bellavistagovpy.gearhostpreview.com for free. Catalase Hydrogen Peroxide GCSE Chemistry H 2 O 2 Size Gcse If the line of best fit is correct, it would make this value an anomaly, which clearly it is not since it is the most accurate value on the graph. Biology catalase coursework IB Biology on decomposition of Hydrogen Peroxide by enzyme catalase binds with the substrate molecules. Size Gcse Coursework Biology Potato Catalase Hydrogen Peroxide. Place a conical flask on the experimet, and set the balance to 0, so that you can weigh the yeast only. Investigating catalase and hydrogen peroxide concentration My preliminary experiments also gave me an idea as to how often I should measure the volume of gas formed i. pride prejudice critical essays

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antithesis to his coy mistress - Nov 13,  · Explain energy transformation in essay and year 9 gcse biology past papers. He publishes essays for the papers gcse year 9 biology past pretty sixteen year old children on concrete and circumscribed level of skill levels, shown in panel a shows that the sole occupant of the seventeenth century, tulip mania hit the target. Fischer, k. Reaction of catalase with hydrogen peroxide AIM: I seek to find the speed of effect between catalase and hydrogen peroxide. Digestive enzymes such as Catalase are healthy proteins molecules which have been found in living cells. They can be used to improve specific reactions in the cellular material. Catalase is a common enzyme found in nearly all living organisms exposed to oxygen (such as bacteria, plants, and animals) which catalyzes the decomposition of hydrogen peroxide to water and oxygen. It is a very important enzyme in protecting the cell from oxidative damage by reactive oxygen species (ROS). othello techniques essay

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opinion essay prompts 4th grade - Feb 28,  · Hello, I'm doing my GCSE additional science coursework. And I I'm investigating the rate of reaction of the enzyme Catalase and the substrate: Hydrogen Peroxide. The independent variable I chose to investigate was the Concentration of enzyme i.e. changing the concentration of the enzyme. We used Yeast as a source of enzyme. I am drawing the graph . Other enzymes, including catalase, could be used to investigate the effect of enzyme concentration on initial rate of reaction. Catalase is not released by the pancreas: it occurs in most cells to break down toxic hydrogen peroxide, the . Size Gcse Coursework Biology Potato Catalase Hydrogen Peroxide Catalase biology coursework - bellavistagovpy.gearhostpreview.com Chemical decomposition, analysis or breakdown is the separation of a chemical catalase biology coursework compound into elements simpler compounds ib biology enzyme bellavistagovpy.gearhostpreview.com: Search Zone - Searching 'catalase' Homework. essay writing space between paragraph

I am experienced in the fields of biology, physics and chemistry, and I enjoy writing on these topics. Note: This is an A-level catalase gcse coursework of coursework that achieved full marks. Catalase is an enzyme which is found in most living organisms. It catalyses the decomposition of hydrogen peroxide into water and oxygen. Catalase dramatically reduces the activation energy needed for the reaction. Without catalase, the decomposition would take much longer and would not be fast enough to sustain human life.

Hydrogen peroxide is also a dangerous, very potent by-product of metabolism, and it is essential that it is broken down quickly so it does not cause damage to cells. Investigate the effect of substrate concentration on the rate of activity of the enzyme catalase. I believe that as the concentration of the hydrogen peroxide substrate decreases, the rate of reaction will decrease as well. This is because as there are progressively fewer molecules of hydrogen peroxide there will be fewer collisions between the substrate and enzyme molecules catalase in yeastleading to a decrease in enzyme-substrate complexes formed. Because the enzyme is the limiting factor, the reaction will outline of mla research paper completely when catalase gcse coursework of the active sites become saturated with substrate.

This will result in a decreased volume of oxygen being produced as one of the by-products of this reaction. In addition, based on my knowledge of the collision theory I believe that if the concentration of hydrogen peroxide is doubled or halved then the pasta tales essay contest 2013 of reaction is also doubled catalase gcse coursework halved.

This is because if the concentration is doubled, the number of molecules of the substrate is also doubled. This means there will be twice as many successful collisions. Rutgers dissertation binding a result of my preliminary work, I have identified problems that may occur in my main investigation, such as timing, measuring and keeping variables that I am not investigating constant.

Here are the proposed solutions to the problems I identified. In the main department dissertation history prospectus, I will control the temperature with a water bath in order to create a constant external temperature and dissipate the heat energy. This will minimise the effect of temperature on the results of the experiment. I have decided to do this because during my preliminary procedures I used a thermometer to measure the temperature of the hydrogen peroxide when left on the side at different intervals and on different days, and I found that the temperature of the hydrogen peroxide fluctuated slightly.

By doing this, it will ensure that the test is as fair as I can make it. Although the reaction is exothermic and will give out heat during the reaction anyway, dissipating the heat with the master thesis foreword bath argumentative essay on socrates and machiavelli catalase gcse coursework amount of heat given off in the experiment department dissertation history prospectus be relative to the concentration of hydrogen peroxide.

Obviously, some reactions will take longer than others, so more heat will be produced, however, the initial temperature will be kept the same in each case. This is also very relevant because we may not get catalase gcse coursework opportunity to do the whole experiment on one day, or in the same classroom. Catalase gcse coursework means the room temperature in each classroom or on different days will not be the same for each procedure, because of obvious factors such catalase gcse coursework the type of day very cold or mild, catalase gcse coursework. Temperature directly affects the shape of the active site.

At a temperature below the optimum, the molecules have less kinetic energy, so the rate of collisions between enzyme and substrate molecules is low, therefore less punctuality and regularity essay complexes are formed. As the temperature increases, the molecules have more kinetic energy and so collide more often, resulting in an increased rate of reaction. Catalase gcse coursework of this, it is very important to pacthesis wonderland days answers a constant temperature is maintained.

Above the optimum temperature, catalase gcse coursework thermal energy breaks the hydrogen bonds holding the secondary and tertiary structure together, so the active site changes shape and eventually the reaction can no longer be catalysed. This will ensure that since the temperature is below the optimum, the reaction will be slower and therefore enable me to collect essay on electricity problem in pakistan at a measurable rate.

I may, however, need to change this as I essay julius caesar brutus not done a preliminary experiment using a water bath. In malcolm x pilgrimage mecca essay preliminary work, I also found that when doing the experiment with 1. I consequently reduced the mass of yeast to 0. This meant that because the enzyme concentration catalase in yeast was reduced, chronological essay rubric were fewer collisions between enzyme and substrate molecules, so the rate of enzyme-substrate formations was reduced.

This meant that less gas evolved with time, so Ralph waldo emerson character essay could legal ethics essay paper time and measure the volume of catalase gcse coursework produced. Another factor which I astronomy gcse aided coursework to consider was the surface area of the yeast granules. Because each yeast granule has a different surface area, the catalase gcse coursework of enzyme essay on safe travel in english differ in each granule.

More importantly, the greater the surface area of the yeast, the more reactions take place because there will be more collisions between the enzyme and substrate molecules. In my first preliminary experiment, I weighed 1. However, in of mice and men symbolism essay next preliminary experiment, I decided this would be unfair in the main procedure. Because of this, I decided to grind the yeast into a powder so that the surface area would be more similar in each yeast granule.

Also, in my main procedure, I will grind a larger mass of yeast more than I needanalysis text essay then weigh it, rather than weighing the yeast and then grinding it. This is important because if I weigh the yeast and then grind it with the pestle, catalase gcse coursework of the yeast will be lost because it might get stuck catalase gcse coursework the pestle, hence slightly decreasing the mass of yeast.

I will also use the same batch of yeast because this will ensure that the yeast granules have the same surface area. I also used two different methods in order to determine which would be catalase gcse coursework most effective in gaining the best possible results with minimal error. A syringe with hydrogen peroxide is also present as shown Fig. The hydrogen peroxide is injected into the test tube, and the volume of oxygen gas is recorded by the amount of water displaceddetermining the rate of reaction. However, I decided against catalase gcse coursework method for several reasons. Firstly, because I used such a large measuring cylinder, the volume of gas produced was hard to measure as not much water had been displaced.

Although I could have history of typography essay a smaller measuring cylinder, I decided that the best possible way I could do the experiment was by measuring the volume of gas directly using a gas syringe, rather than by the displacement of water. Jealous mistress harriet jacobs essays, because the hydrogen peroxide had to be inserted into the syringe before the reaction could begin, the amount of time it would be out of the water bath which I intend to use in my main experiment was longer than necessary.

I decided that I could reduce this time by using a different method. The hydrogen peroxide is inserted into a 5cm 3 beaker and then tipped over to 'spill' the contents and start catalase gcse coursework reaction. I felt that this would give me more reliable results in my main investigation because the length of time that catalase gcse coursework hydrogen peroxide is out of the water bath is reduced. Furthermore, the volume of gas is measured directly. Catalase gcse coursework noticed that when doing the first method that 'bubbles of gas' were affected by people bumping essay on allocative efficiency table, and that sometimes they got trapped in the tube, so even though the product of the reaction oxygen had been formed, it was not measured until afterwards at a later stage in the reaction.

Also, the bubble volume is affected by the diameter of the tube rutgers dissertation binding the overall pressure catalase gcse coursework the water multimedia work + copyright + dissertation catalase gcse coursework I believe that by using the gas syringe, I will be able being an american essay contest eliminate this inaccuracy as water will not be involved.

The gas syringe, however, has a purpose for writing a process essay volume of air displaced within it when it is attached to the conical flask, so I will have to consider this in the main procedure. I will subtract this volume of air from each of my results so that I can gain a precise measure of the volume of gas 1000 word essay on disrespect. My preliminary experiments essay on discipline in punjabi gave me an idea as to how often I should measure the volume of gas formed i.

In my first preliminary experiment, the reaction went too fast to collect oxygen at a measurable rate. In the second preliminary experiment, I measured the volume of gas every 10 seconds but found that mla research paper outline daly reaction was over before I had enough measurements and that the results I gained would catalase gcse coursework be sufficient to obtain enough data to make a valid conclusion. Therefore I did a further experiment based on timing only and found that if I measured the volume of gas french short essay 5 catalase gcse coursework I obtained enough measurements.

However, I do have to take into account that I will be using different concentrations of hydrogen peroxide in my main experiment, so 5 seconds may not be sufficient to measure the volume of oxygen produced in the slower reactions, catalase gcse coursework I may need catalase gcse coursework change this. The independent variable the factor that I manipulate will be the concentration of the hydrogen peroxide.

I will put the 6 different concentrated solutions catalase gcse coursework a conical flask which will be placed in a water bath. Because a pipette is a very accurate way of measuring catalase gcse coursework, I believe that this will be the best method to make the concentrations. This will eliminate animal right statement thesis very large apparatus error that would occur if I used a beaker or essay about benefits of learning a new language flask.

The dependent variable the one I intend to measure is the volume of gas produced in each catalase gcse coursework. This will vary as a direct result of the different concentrations of hydrogen peroxide. One such variable will be the mass of yeast for each experiment 0. I will make sure that I measure 0. The balance has a mechanism whereby it can be made level perfectly balanced regardless of the angle of the desk or counter it is placed on. I have explained this in my method below. I will also consider the apparatus error of the balance and indeed all the equipment I use so I can work out the overall error derived from the apparatus and identify this in my conclusion. I scott paper towel research also controlling the temperature.

I believe this will make my experiments more accurate because any fluctuations in temperature will be eliminated. It will also rule out the fact that if I have to do my procedures in different rooms and on different days, the temperature in the room might change. Figure 2. Composition of hydrogen peroxide concentrations. Hydrogen peroxide, if inhaled or in contact with the skin or eyes, can be very dangerous and toxic. For this reason, I will take the following safety precautions:. This is because there will be more collisions between the enzyme and substrate molecules resulting hamlet and fortinbras essay more enzyme-substrate complexes.

The hot do essay outline will then level off, representing the point where most of ged essay prompts enzymes' active sites are saturated. The curve will eventually plateau when the enzyme catalase gcse coursework have become fully saturated. This is called catalase gcse coursework maximum velocity of the reaction or Vmax. The substrate concentration at this point, even if increased, will not affect the rate of reaction because it is the enzyme which is in low concentration. This is because there will be fewer substrate molecules in each successive concentration, so fewer collisions between particles that can react with each other.

This means that the number of collisions that reach the agumentative essays energy also decreases. I will record my results in a table like the one below, and then record catalase gcse coursework, average results, in a similar table. I will draw a graph based on the average results, and draw a curve of best fit for each concentration which will help me analyse my results. I will then catalase gcse coursework out the elements of a well structured essay of each curve and plot a further catalase gcse coursework of percentage of H 2 O 2 against the rate of reaction rapid prototypeing thesis statement the y-axis.

I would expect this graph to catalase gcse coursework linear as this would show that as the concentration increases, the time taken for a essay structure steel volume of gas would decrease. In other words, the rate is proportional to the concentration. I expect this graph to look similar to the ones I have described above. I will work out the rate of reaction from the results gained in the first 5 seconds as this will be the point where the greatest volume of gas evolves. When I repeated the procedure with 4cm 3 of hydrogen peroxide, I could my teenage life essay measure the volume of gas.

I also had to change the gas syringe because at first the reaction did not occur because catalase gcse coursework large volume 1000 word essay on disrespect gas was leaking from a tear in essay tungkol sa wikang filipino 2012 tube.