To prepare a temporary mount of aleaf peel to show stomata. B) Materials required:- Fresh leaves of plant‚ compound microscope‚ glass slides‚ cover slips‚ water‚ glycerine‚ safranine‚ blotting paper‚ needles‚ brush etc. C) Theory :- i) Stomata are minutepore present on the surface of the leaves. ii) Though they are found on both the upper and lower epidermis of the leaf‚ they are more in number on the lower epidermis. iii) Each stoma has two bean shaped
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results. For example‚ provide genetic and biochemical explanations to explain your results. Important: Students are required to hand-in their worksheets before leaving the class. Ensure that your name/ ID no. and sample number are recorded. The report should be written according to the sample problem provided in the handout. Question: Seeds of the F1 generation derived from a cross between two different yellow-seeded varieties of corn were collected as Sample F1. The F1 plants were selfed
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Introduction Enzymes are catalytic proteins. The purpose of a catalyst is to speed up metabolic reactions by lowering the free energy of activation or activation energy. Activation energy is known as the amount of energy needed to push the reactants over an energy barrier‚ so that the downhill part of the reaction can begin (Campbell 151). In an enzyme catalyzed reaction‚ the enzyme binds to its substrate‚ which is the reactant an enzyme acts on. In the reactions‚ the enzymes are very specific
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Figure 3 Superoxide radical scavenging activity. Values are mean ± SEM (n = 3). ABL‚ lyophilized aqueous extract of A. bilimbi fruits; ABP‚ petroleum ether fraction of ABL; ABE‚ ethyl acetate fraction of ABL; ABB‚ butanol fraction of ABL; ABW‚ aqueous fraction of ABL; QU‚ quercetin. 3.3.5 Nitric oxide radical scavenging activity Lyophilized aqueous extract of Averrhoa bilimbi fruits (ABL) and its different solvent fractions exhibited a dose dependent inhibition of nitric oxide radicals. The IC50
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Ayaan Nadeem SBI 4UO-A Tuesday‚ February 27‚ 2013 Ms. Balmer Pineapple Jelly Enzyme Lab Discussion After completing the Pineapple Jell-O Enzyme lab‚ the final results were that the canned pineapple formed the jelly while the fresh pineapple did not. Pineapple In order for this to have occurred‚ there has to be a comparison between fresh and canned pineapple in terms of their physical and chemical properties. The physical properties of fresh pineapple are that it is sweet‚ ripe and raw.
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How is pH affecting catalase activity? Hypothesis The catalase activity is assumed to be the most active in pH7. The higher or lower concentration away from the optimum pH of catalase‚ the slower the rate of activity is. Data Collection & Processing I collected the results of pH4‚ pH7‚ pH10 and pH13 after 2 minutes‚ and I repeated the experiment 3 times. Below is a table to show the results‚ their averages and standard deviations: | 1st time (sec) | 2nd time (sec) | 3rd time (sec)
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regular hydrogen peroxide 1%‚ 25%‚ 50%‚ 75%‚ and 100% substrate concentration tweezers timer permanent marker pen/pencil paper for data PROCEDURE: The experiment begins with five beakers full of various substrate concentrations. To begin the lab‚ gather five plastic‚ Solo cups and label them 1%‚ 25%‚ 50%‚ 75%‚ and 100% with the permanent marker. Then‚ fill each cup with 75 mL of regular hydrogen peroxide. After‚ lightly dip the filter paper into the 1% substrate concentration till it is completely
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Lab Report: Toothpickase and Enzymes September 19‚ 2012 Olivia DePhillips Lab Partner: Joy Morgan Meyers Signature: Introduction Enzymes are biological molecules that catalyze chemical reactions. In enzymatic reactions‚ the molecules at the beginning of the process‚ called substrates‚ are converted into different molecules‚ called products. Almost all chemical reactions in a biological cell need enzymes in order to occur at rates sufficient for life. Like all catalysts‚ enzymes work
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TEMPERATURE ON CATALASE ACTIVITY AIM The aim of this experiment is to find out the effect of temperature on catalase or hydrogen peroxide. This will enable us to tell at what temperature hydrogen peroxide is most efficient. This (degradation) reaction will help us determine some of the catalase’s different attributes. HYPOTHESIS In this experiment it would be safe to hypothesise that no activity would take place at 1 to 20 degrees. It would be probable that a little activity would take place around
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Year 11 IB Biology IA Report 2011 5/31/2011 Enzyme Activity Experiment Introduction 3 AIM 3 Materials 3 Method 4 Result 5 Table 1: 5 Table 2: 5 Graph 1 6 Discussion 6 Conclusion 8 Bibliography 9 Appendix 1 (Test tube 3- 45 degrees) 9 Appendix 2 (Test tube 1- 5 degrees) 9 Appendix 3 (Test tube 2- 20 degrees) 9 Introduction Phenolphthalein is an indicator that is pink in alkaline solutions of about pH10. When the pH drops below pH 8.3 phenolphthalein will
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