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Effect of pH on enzyme activity independent variable

How Does pH Level Affect Enzyme Activity? Sciencin

A pH environment has a significant effect on an enzymes. It can affect the intramolecular forces and change the enzyme's shape -- potentially to the point where it is rendered ineffective. With these effects in mind, typical enzymes have a pH range in which they perform optimally Independent variable - pH level Dependent variable - Time taken for starch to be broken down. Control variables - Temperature, volume and concentrations of enzyme solution and starch solution The effect and rate of enzyme activity on potato cells and pH levels can be measured by the thickness of the foam layer produced in a test tube. The independent variables in this lab are temperature and pH and the dependent variable is the thickness of foam being measured

The rates of enzyme-catalysed reactions vary with pH and often pass through a maximum as the pH is varied. If the enzyme obeys Michaelis-Menten kinetics the kinetic parameters k 0 and k A often behave similarly Sketch Graph to show the expected effect of differing pH levels on the activity of the enzyme catalase. Independent Variable. The independent variable is the value of the pH buffer (from 1-7) which was used in each beaker of H 2 O 2. 15ml was added each time using a graduated syringe. Dependent Variable Variables:Dependent variable:Rate of catalase reaction when dropped into a clear vial containing 20ml of hydrogen peroxide at three different pH levels. Independent variable:The pH of a 20ml clear vial of hydrogen peroxide. Controlled variable:Temperature All tests were taken in the same room, at room temperature Extremely high or low pH values generally result in complete loss of activity for most enzymes. pH is also a factor in the stability of enzymes.nAs with activity, for each enzyme, there is also a region of pH optimal stability. I will also be measuring the rate at which oxygen is evolved and how it reflects the activity of the enzyme catalase

Investigating the effect of pH on amylase activity Class practical Measure the time taken for amylase to completely break down starch , by withdrawing samples at 10 second intervals and noting the time at which the solution no longer gives a blue-black colour with iodine solution (but the iodine solution remains orange) Factors Affecting Enzyme Activity by John Eed (Biology 1151) Abstract: e studied the effect of temperature, enzyme concentration and pH on enzyme activity. The enzyme we studied was hydrogen peroxidase from a cow. The reaction converted hydrogen peroxide to water and oxygen and oxygen production was used as a measure of enzyme activity The results from the experiment determining the effects of pH on enzyme activity show that as the independent variable, pH, increases the dependent variable, percentage transmission, decreases. This is shown in the results as at the lowest pH, pH 4.0 the average percentage transmission is at its highest at 97% Enzyme Activity. The effect of pH on sucrase activity in sucrose solutions with varying pH values from 3.0 to 9.0 will be assessed. Now determine the dependent, independent, and controlled variables for each experiment in this laboratory activity by clicking on the appropriate answers

When testing the effect of pH on enzyme activity, vary only the pH while holding other factors constant. These other factors include enzyme concentration, substrate concentration and temperature. The factors that remain constant are called the control variables Understanding: Temperature, pH and substrate concentration affect the rate of activity of enzymes. Extremely high or low pH values generally result in complete loss of activity for most enzymes. pH is a factor in the chemical stability of enzyme structure. Draw a graph of depicting the effect of pH on the rate of enzyme activity Independent variable Dependent variable Controlled variables Does fertilizer make rate of enzyme activity? pH in each test tube. 1. The amount of enzyme activity. 2. The amount of substrate State a hypothesis regarding the effect of pH on the function of the digestive enzyme amylase. 18. Using any of the materials listed below, design.

Practical - pH and the rate of enzyme controlled reactions

Effects of pH and Temperature on Enzyme Catalyzed Reactio

to investigate the effect of pH on enzyme activity. what is the control variable? temperature - water bath. what are possible sources of error? different volumes of solution time errors. what is the independent variable? pH of solution. what is the dependant variable? time taken for starch to be broken down by amylase. how do you work out the. An Investigation into the Effect of Varying pH on Enzyme Activity Essay Sample. Protease is an enzyme that reacts with protein to break it down into its constituents. Enzyme activity can be affected by the change of pH, temperature and the concentration of substrate or enzyme in the solution

Experiment I: The effect of pH on lactase activity. Click on the Simulate tab. The standard condition settings are: lactose for 500 mg/dL , pH at 7.0 and temperature at 250C and 5mmol lactase enzyme solution. You will vary one of these conditions you wish to study in each experiment. The condition you are varying is the independent variable for that experiment. The outcome you measure for that. In this activity, you will study the effect of pH, temperature and lactose concentration on lactase activity. By the end of this activity, you should be able to: design experiments to study the effects of pH, temperature, and substrate concentration on enzyme activity. graph data related to enzyme activity. analyze data related to enzyme activity. identify the components of the scientific.

There will be one choice for Dependent and Independent Variables and multiple choices for Controlled Variables. When you are done, click the Submit button to save your responses to the laboratory report. Top of Form. Effect of pH on Enzyme Activity. Dependent Variable. amount of product (glucose and fructose) produced . Independent Variable. pH. So, you start really acidically, and so the pH is the independent, because that's the one you're manipulating. You completely control what pH your enzyme is, is at, but you don't control what the rate is. That's what you're trying to figure out Effect of pH to the Enzyme Activity Jackline Wairimu Intro to Biology Bio 101-51 4/28/2017 Introduction: There are millions of living organisms that have important uses for enzymes as catalytic proteins. Mixtures for Catecholase Experiment Independent variable in this experiment was the different pH values, while the dependent variable was. A change in pH to a mixture of hydrogen peroxide and catalase will cause the catalase to stop working properly because catalase is an enzyme and since they are very specific it can only function under certain pH and temperature conditions

An enzyme exhibits maximum activity over the narrow pH range in which a molecule exists in its properly charged form. The median value of this pH range is called the optimum pH of the enzyme (part (b) of Figure 18.6. 2) Independent Variable pH 3. Controlled Variables temperature, amount of substrate (sucrose) present, sucrase + sucrose incubation time Effect of Temperature on Enzyme Activity 1. Dependent Variable amount of product (glucose and fructose) produced 2. Independent Variable temperature 3 Since the aim of the experiment is to investigate the effect of pH on the activity of the lipase enzyme, the pH is, therefore, the independent variable. Thus, it must be controlled or varied in all the test tubes in order to see its effect on the activity of the enzyme, which, in this case, would be the dependent variable. New questions in Biolog The two independent variables in the investigation were ph and hydrogen peroxide. Each individual enzyme catalase has its own ph and substrate characteristics, this is as a result of the hydrogen and ionic bonds that make the unique primary structure of an enzyme

Similarly, because APase has an optimal pH (neutral), manipulating the pH to be more acidic or basic will cause the enzyme to decrease in functioning. The null hypothesis for week 2 is that pH and/or temperature will have no effect on enzyme functioning Effect of temperature on enzyme activity In this experiment Independent variable: Temperature of the amylase Dependent variable: Enzyme activity which is measured by the time for disappearance of starch Controlled variables: Volume of amylase; volume of starch solution; concentration of amylase; concentration of starch solutio Not only enzymes, the pH level may also affect the charge and shape of the substrate. Within a narrow pH range, changes in the structural shapes of the enzymes and substrates may be reversible. But for a significant change in pH levels, the enzyme and the substrate may undergo denaturation. In such cases, they cannot identify each other The Effect of pH on the Rate of Enzyme Catalysis of Catalase Objectives: The objective of this lab was to develop a protocol to investigate the effect of an environmental variable on the catalytic function of an enzyme. More specifically, the objective was to perform an experiment in order to.

10.7: The Effect of pH on Enzyme Kinetics - Chemistry ..

  1. ing the effects of pH on enzyme activity show that as the independent variable, pH, increases the dependent variable, percentage transmission, decreases. This is shown in the results as at the lowest pH, pH 4. 0 the average percentage transmission is at its highest at 97%
  2. Sketch a graph showing the effect of pH on enzyme activity. Explain why it has this shape. - IV: variable that affects rate of enzyme activity - just one independent variable if pH is independent variable, temperature would be control variable and must be kept at a suitable temperature using a water bat
  3. In order to discover the effect of pH levels on pepsin enzyme activity, the pH level will be the independent variable in the experiment. Varying pH values will be tested in order to gain a range of results and to highlight that pepsin has an optimal pH range in which it perform most effectively
  4. For both variables, our solution analyses the activated and deactivated phases of an enzyme as phenomena of different nature. The system is described with independent probability functions. The interactive effects between T and pH are introduced with simple auxiliary functions
  5. We suggest a new and general model to describe the effects of temperature (T) and pH on the catalytic activity of enzymes. Despite the abundance of models to describe those effects, the current proposals are unsatisfactory, except for specific experimental cases in which the interactive mechanism between the two variables does not exist
  6. explain why increasing enzyme concentration promotes enzyme activity; explain why the optimal pH of a particular enzyme promotes its activity Within the experimentation process it will be important to identify the independent variable, the dependent variable, and standardized variables for each experiment. What is the effect of.

[2] Convert enzyme concentrations of 2.5%, 5.0%, and 10% to ppt units. [3] For Procedure I/Table I, identify: Independent variable: Oxygen Concentration. Dependent variable: Enzyme Reaction Rate. Control variables: Elapsed Time [4] Draw a graph of the independent variable on the x-axis (abscissa) and the dependent variable on the y-axis (ordinate) Sucrase will have the greatest activity at 40 °C (104 °F) 3. Sucrase activity increases with increasing sucrose concentration until a plateau is reached. Materials and Methods Effect of pH on Enzyme Activity. 1. Dependent Variable. amount of product (glucose and fructose) produced 2. Independent Variable. H 3 Design an experiment in which you will test the effect of an acidic fluid on enzymatic activity. Recall: enzymes are proteins! To complete this project, it may be useful for you to first review the Scientific Method Tutorial, the OLI module about pH and enzymes, Lab 1 (Introduction to Science) and Lab 4 (Enzymes) The entire method is then repeated for the other pH buffer solutions (e.g. pH5, pH6, pH7, pH8). For more detail on the set-up of this experiment, watch our high-quality required practical video on YouTube. Enzyme activity required practical variables: Independent variable: pH of the amylase's environmen The Effect of low pH on Enzyme Activity. Design an experiment in which you will test the effect of an acidic fluid on enzymatic activity. Recall: enzymes are proteins! Identify control and experimental samples, as well as independent and dependent variables. Also include the methods used for data collection and analysis (20 points). 4.

The purpose of my experiment is to determine the effect of hydrogen peroxide amount, temperature, pH, enzyme amount, and inhibitor on catalase activity. The independent variables are: substrate amount (ml), temperature (celsius), pH, enzyme amount (ml), and copper sulfate (mmoles). The dependent variable is rate of oxygen production (mmoles/sec)

The Effect of pH on Catalase Activity - AUEssays

  1. imise fluctuations) pH (acidic or alkaline solutions
  2. e its effect on enzyme activity. Your . dependent variable . is the rate or amount of oxygen production and you will need a number of . controlled variables
  3. This is due to the increased possibility of enzyme colliding with a substrate to form the enzyme-substrate complex (because there are more enzyme molecules present in a given value.).Independent variable in this investigation is the concentration of trypsin (2%, 1%, 0.5% and 0.25%) as that is what we will be changing, whereas the dependent.

Investigation of the Change of pH Affecting Enzyme Activit

  1. A researcher is interested in the function of enzymes that digest protein in different parts of the digestive system. He has isolated the enzymes pepsin and trypsin from two organs in the digestive system. the stomach has a pH level of 2 and the small intestine has a pH level of 8. To investigate the effect of pH of these enzymes, he sets up test tubes with each enzyme at different pH values
  2. Which variable has the least effect on enzyme activity? a. Temperature b. Light intensity c. pH d. Substrate concentratio
  3. Therefore, this investigation looks at the effect of one of these two factors, temperature, on the enzyme amylase. This is an enzyme found in the salivary glands. It is used to break down starch into maltose as part of digestion. To measure the activity, we see how long it takes for the starch to disappear, by testing for it with iodine. Ai
  4. The statistical analysis of polyphenol oxidase has shown that there was a negative significant effect of storage on enzyme activity, i.e., the activity was lower for stored samples. No interaction among the independent variables was detected. Operational time presented a slight negative linear effect i.e., activity dropped linearly with time
  5. Effect of pH on the enzyme activity Maximum activity of the enzyme was found when the substr ate concentrtion of 4.5 mL (Fig. 3). As substrte concentr ation incr eases, the r te of r eaction (enzyme acti vity) also incr eases up to cer tain point. An enzyme is sa tur ated w he
  6. The enzyme concentration also speed up the rate of enzyme activity, but if the enzyme reach on a certain level than it stay the same. (William D. Schraer Hert J.Stoltze 2010) There are four variables that affect enzyme activity: Temperature, pH, and Substrate/enzyme concentration

Investigating the Effect of Ph on the Activity of the

Example: Enzyme activity is affected by changes in pH. In this investigation, it was determined that the enzyme lactase ceases to function at a pH greater than 9 and less than 7, with optimal activity measured at a pH of approximately 8.0 In this research, an experiment was undertaken to test the effect of pH on the function of the enzyme lactase Enzymes are sensitive to environmental conditions. If the conditions deviate too much, enzymes may stop functioning. To examine the effects of environmental changes on enzymatic activity, we will work with the enzyme catalase. This is a very common enzyme that is present in most living organisms Explain properties of enzymes: Substrate specificity and Effect of temperature and pH on enzyme activity. Additionally, effect of enzyme concentration on enzyme activity. Plot required graphs using the correct independent and dependent variables. Introduction. Enzymes are proteins that catalyze chemical reactions in a cell. Enzymes speed up. How to measure the enzyme activity (i.e. the dependent variable) Choosing the Independent Variable. The main factors which will affect the activity of an enzyme on a given substrate are: Temperature (use water baths to minimise fluctuations) pH (acidic or alkaline solutions) Substrate concentration (choose range to avoid saturation Write an Introduction Section (1 or 2 paragraphs) State the purpose of the Effect of Temperature on Lactase Activity experiment. Write a hypothesis for the experiment. Identify the independent variable and dependent variable for the experiment. Background Research: Research your experiment. Write 2-3 paragraphs which give an overview of enzymes

Title (5 pts): The Effect of (A) on (B) Example: The Effect of pH on the Activity of the Enzyme Lactase. 2. Introduction (10 pts) a. Background Present a review of the topic. Place the research/experiment in the proper context of biology. Relate your experiment to the concepts learned in class pH - using buffers to maintain a pH (see also Investigating the effect of pH on amylase) comparing the effects of trypsin with the effects of other enzymes - lipase or amylase - to demonstrate the specificity of enzyme action. the inhibitory effects of heavy metal ions

Investigating the effect of pH on amylase activit

  1. e the effects of substrate concentration and pH on the rate of an enzyme-catalzyed reation. Background: Amylase is an enzyme that catalyses the hydrolysis of starch into sugars
  2. Allows scientist to decide if the effect is really due to the indepentent variable. Prediction can change the three-dimensional shape of the enzyme and alter its rate of activity enzymes in the human body are designed to work at pH 7 and about 37 o C Effect of pH on amylase activity Independent Variable Dependent Variable Result.
  3. Like all proteins, enzyme structure, and therefore its activity, can be modified by external factors, including pH and temperature. In particular, a higher temperature generally makes for higher rates of reaction, enzyme-catalyzed or otherwise. However, either increasing or decreasing the temperature outside of a tolerable range can affect.
  4. Design an experiment in which you will test the effect of an acidic fluid on enzymatic activity. Recall: enzymes are proteins! To complete this project, it may be useful for you to first review the Scientific Method Tutorial, information about pH and enzymes in the text book and course modules, Lab 1 (Introduction to Science) and Lab 4 (Enzymes)
  5. reported the effect of high pressure treatments on pectinesterase and peroxidase activity in model systems from mandarin juice. Neither enzyme was completely inactivated after pressurization from 100 to 400 MPa, although no recovery of enzyme activity was observed during storage. Similar behavior was observed for polyphenol oxidase activity

Question: What is the effect of temperature on catalase enzyme activity? Variables- Independent- Temperature Dependant- Amount of gas produced -Amount of liquid left in test tube Controlled -Amount of Hydrogen Peroxide -Amount of potato enzyme Materials -Hot temperature water bath (set at 90 degrees C) -Cold temperature water bath (set at . 5. 4 Read step 6 to determine whether the pH or foam height is the independent variable or the dependent variable. Label the independent variable and the dependent variable in the table below. Use this table to record your observations from step 6. TABLE 1. THE EFFECT OF pH ON ENZYMATIC ACTIVITY Independent Variable: Dependent Variable

For both variables, our solution analyses the activated and deactivated phases of an enzyme as phenomena of different nature. The system is described with independent probability functions. The interactive effects between T and pH are introduced with simple auxiliary functions. These functions describe the variations induced by each variable in. 5. Identify the control, independent variable, and dependent variable in this investigation and explain . why you identified each as this. Supplemental Activity Your instructor believes that enzyme controlled reactions will not function well in strong saline (salt) solutions Materials and Methods Effect of pH on Enzyme Activity. 1. Dependent Variable. amount of product (glucose and fructose) produced 2. Independent Variable. pH 3. Controlled Variables. temperature; amount of substrate (sucrose) present; sucrase + sucrose incubation time Effect of Temperature on Enzyme Activity. 1 How does pH effect the activity of the enzyme amylase and the hydrolysis of starch? Hypothesis: Amylase is an enzyme that acts on starch. pH is capable of altering the structure of the active site centre in the enzyme leading to denaturation. At each pH, the enzyme activity would be relatively different The dependent variable is the Molecules of Product Formed per minute. The Independent variable is the pH. Describe the relationship shown in your graph between pH and enzyme activity. At what pH did you see optimum enzyme activity (2 pts)? The more the pH level got away from being neutral the less product was created

Enzymes are affected by changes in pH. The most favorable pH value— the point where the enzyme is most active—is known as the optimum pH. This experiment was conducted to determine the effect of pH reaction rate on an enzyme, catalase, from yeast. The experimental results indicate that the catalase worked best at a neutral pH level of seven. The Effects of PH and Temperature on Enzyme Activity of Lactase on Lactose. Lactase is a digestive enzyme that catalyzes the break down of lactose, a sugar found in milk. Lactase functions best within limited ranges of both temperature and pH in its given environment, making it dependent on both factors for it to. The effects of temperature, PH and enzyme concentration on enzyme activity. such that increasing the substrate concentration will no longer increase the enzyme activity. Variables: Theindependent variableis the per centum concentration of the 3 % H peroxide in the aqueous solution. This will be measured by thining the H peroxide utilizing a.

Variables. In this experiment, the independent variable was the concentration of the trypsin enzyme. It was varied in stages of 0.1% concentration from 0.1% to 0.5% by diluting a 0.5% concentration sample with distilled water What is the effect of pH on enzyme activity? 4. What is the effect of temperature on enzyme activity? over-> ANALYSIS: For EACH variable, use the AVERAGE rates to construct a graph of the independent variable vs. the dependent variable. This means you will have four graphs: Enzyme concentration (x axis) vs. Rate (y axis Factor to monitor (independent variable) - pH: pH is one of the most important factors affecting catalase and all enzyme activity, by analysing reaction rates over a range of pH levels (pH3 - pH11), this investigation will show at what pH catalase activity will be at its optimum The Effects of an Enzyme Catalyst on H 2 O 2 and inhibitors can affect the activity of the catalase. pH would have an effect on the catalase because of how acidic or basic the substrate is. Temperature affects the catalase by affecting the speed at which it works. The independent variable is: Time in Seconds (x-axis) b.. For every enzyme, there is an optimum pH value, at which the specific enzyme functions most actively. Any change in this pH significantly affects the enzyme activity and/or the rate of reaction. To know more about the relation between pH and enzymes, and/or the effect of pH on enzymes, go through this write-up

By changing the concentration of Hydrogen Peroxide, I expected that the rate of the enzyme activity would increase as the concentration increases, thus the circular filter disc floating faster up to the surface. Although, there is always a possibility for the rate of enzyme activity to get manipulated by the temperature, pH etc ml, then the enzyme activity is: 32 ml/1 min = 32 ml/min. For each part of A-F, you will chart enzyme activity on the Y axis (dependent variable) and independent variable (parts A-F) on the X axis. Protocol Work as team 4 at the table to conduct the experiment. Each group will be assigned one or more specific experiments in the laboratory to examine the effect of either pH or temperature on peroxidase activity. There is a set of buffers of pH 4, 7, and 10 and temperature treatments of 4, 20, and 80°C. The first step in this exercise is for your group to decide which variable (pH or temperature) you will test. Remember you should only vary one factor all others should remain. 5. Compare the rate of the pepsin-catalyzed reaction at pH 8 with the rate of the lipase-catalyzed reaction at pH 8. 6. Using your knowledge of protein structure, explain in detail the effect of exposing an enzyme to a pH outside of its optimal range. Include the effect on both enzyme structure and function. 7

Factors Affecting Enzyme Activit

Effect of enzyme concentration. To test the effect of enzyme concentration, dilutions have been changed so that a variable amount of enzyme is added to a fixed amount of substrate. The cell-wall stock solution is 0.25 mg m1-1 cell-wall material suspended in a 0.05 M sodium phosphate buffer pH 6.2 pH, but stopped increasing, even began decreasing at a certain variable level. And the other two variables did not have such an obvious effect on RR. Fig. 2. Interactive effects of enzyme dosage (chitosan-to-enzyme ratio) and pH on RROther parameters: pH 6.0 andglutaraldehyde concentration 0.17%. IV II. Effect of pH 1. In the activity, how do you measure the bubble volume? 2. What is your hypothesis for this experiment? 3. What is your strategy to test your hypothesis? 4. What was the dependent variable in the pH experiment? What was the independent variable in the pH experiment? 5. How will HCl affect the pH of the solution? 6 The rates do increase in the beginning, but continues to rise after the pH of 9. This is inconsistent with how catalase works because the enzyme denatures in solutions above a pH of 7. <br />This experiment was conducted within a range of pH 3 to pH of 11, so this investigation is valid

13 In the Effect of pH on Enzyme Activity virtual lab what

Investigating how pH effects the enzyme trypsin acting on

Factors affecting Enzyme Activity. The activity of an Enzyme is affected by its environmental conditions.Changing these alter the rate of reaction caused by the enzyme. In nature, organisms adjust the conditions of their enzymes to produce an Optimum rate of reaction, where necessary, or they may have enzymes which are adapted to function well in extreme conditions where they live This variable must be controlled as temperature like pH can also effect the action of amylase. If the temperature is too low the enzyme cannot function well, and if it is too high it gets denatured then cannot function at all. pH (pH) (± 0.05) of the salivary amylase solutions How does an enzyme's activity change with increasing concentration of substrate? The enzyme's activity increases as pH increases 5.0 to 9.0. The enzyme's activity is greater around pH of 8.0 . What is the dependant variable in testing the effect of temperature on enzyme activity? answer choices . enzyme AND ESTIMATION OF COMBINED EFFECT OF SOME CHEMICALS ON ENZYME ACTIVITY USING the enzyme activity at pH values ranging from 4.0 to between dependent and independent variables is no

Pre-Lab Reporting - Wile

If the amount of O 2 produced after one minute of reaction time is 32 mL, then the enzyme activity is: 32 mL/1 min= 32 mL/min. For each parts A-F, you will be graphing enzyme activity on the Y-axis (the dependent variable) and the independent variable (parts A-F) on the X-axis Effect of pH on Enzyme Activity. The pH scale measures the numbers of hydrogen ions (each with a +1 charge) present in solution. The scale in biological systems runs from 0 (strongly acidic) to 14 (strongly basic). 7, the neutral point, is the pH of pure water. Recall that the folded structure of protein molecules is in large part due to. Effect of different pH on Enzyme Activity. EEI: 2011- Year 11 Biology. Written by: Donnet, Luke. The independent variable was the difference of pH in the different test tubes, it was the only.

IB Biology Standard 2

The Effect of pH on Catalase Activity - UKEssays

In this experiment the observations that were made are consistent with the hypothesis made. During the experiment it was observed that the pH levels affect the activity of lactase enzyme. The enzymes denatures if the pH present is too high or too low. The pH 7 is optimal pH for lactase enzyme. At 7 the pH enzyme is the most active To determine the effect of substrate concentration on the initial rate of an enzyme-controlled reaction. You will be able to test enzyme activity at pH 3, 5, 7, 9, and 11. Run the following tests: What is the independent variable for the first graph (reaction rate vs pH)? For the second graph (reaction rate vs substrate amount) Aim. Investigate the effect of substrate concentration on the rate of activity of the enzyme catalase. Hypothesis. I believe that as the concentration of the hydrogen peroxide (substrate) decreases, the rate of reaction will decrease as well

What Is Varied When Testing the Effect of pH on Enzyme

activity when the enzyme's temperature is changed from room temperature below. _____ _____ Variables: Determine the independent and dependent variable. The independent variable is the variable that is manipulated by the experimenter. The dependent variable is the responding variable to that change. Independent variable: ____ Students identify the independent and dependent Students plan and conduct investigations to test how temperature and pH affect enzyme function. Students are supported in developing their protocols through the use of a 'steps' activity where all the steps of the investigation are written on separate pieces of paper Afterwards, I labeled the beakers 1) pH 13, 2) pH 10, 3) pH 7, 4) pH 4, and 5) pH 1, and then added the pH solutions accordingly. The positive control was the pH 4 test tube, and the negative control was the pH 13 test tube. The independent variables were time and pH levels, and the dependent variable was the amount of eaction that occurred Investigation the effect of the temperature on the activity of amylase Aim: The aim of the experiment is to detect how different ranges of temperatures as a significant factor on the rate of the reaction has impact on the prosperities of enzyme amylase and carbohydrate as starch under independent variable which is time required for reaction and. The aim of the investigation was to explore the effects of changing the concentrate of a substrate called hydrogen peroxide on the activity of the enzyme catalase in yeast. The independent variable was the concentration of the hydrogen peroxide used

iv Independent variable Temperature v Dependent variableHow does the pH affect the activity of amylase - A-LevelThe effect of pH on the reaction between pepsin and eggWhat is the objective of this exercise To determine the

This enzyme breaks down hydrogen peroxide, which is a harmful by-product of the process of cellular respiration if it builds up in concentration in the cells. If we use potato or other tissue containing this enzyme, we can use this to measure the relative influence of varying several different factors on the activity of enzymes in living tissue Introduction: Week 2: Enzyme Lab. In this activity, you will study the effect of pH, temperature and lactose concentration on lactase activity. By the end of this activity, you should be able to: design experiments to study the effects of pH, temperature, and substrate concentration on enzyme activity. graph data related to enzyme activity Independent Variable: Dependent Variable: Constant (or Control Variable) Measure the enzyme activity at 22 C (room temperature): CLEAN OUT ALL TEST TUBES TO BEGIN THE NEXT PART OF THE LAB. Part 3: Testing the Effects of pH on Enzymatic Activity 19. Place three clean test tubes in a rack and label them pH 4, pH 7, and pH 10 Independent variables: reaction temperature (0°C, room temperature during the experiment, 40°C, 60°C, 80°C). Controlled variables Significance/effect if not controlledMethod of control Volume of amylase solution in each test tubeThe volume of amylase solution in each test tube needs to be a constant number, because we do not know if this.

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