Exercise Biochemistry (08PEB022) June 2009 2 Hours PART A: SHORT ANSWER QUESTIONS (allow 60 minutes for this section) Answer all the questions in this section 50 marks are available for this section 1. Briefly state the role of the following proteins in skeletal muscle: (5 marks): (a) myosin (b) hexokinase (c) lactate dehydrogenase (d) carnitine acyl transferase (e) creatine kinase 2. Explain why the contribution of anaerobic metabolism to energy supply increases with increasing
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1. Use the information in the table and your own knowledge to answer the questions below. (a) (i) Where was protein broken down? .......................................................................................................................... (1) (ii) Where was fat broken down? .........................................................................................................................
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Experiment 1. The test for starch (a) Label four test-tubes 1-4. 10% glucose solution into tube 1 1% starch solution into tube 2 (b) Put about 20 mm (depth) of 1% albumen solution into tube 3 water into tube 4 (c) To each tube, using a dropping pipette
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kinase is an enzyme that catalyse the transfer of a phosphate group from phosphoenolpyruvate to adenosine diphosphate during glycolysis. i) Define the term “enzyme” and state its function. (2 marks) ii) Explain why pyruvate kinase can only catalyse this reaction but not other reactions. (3 marks) (b) Figure 1.1 shows the result of an investigation using enzyme sucrose to break
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Outline * Name of the enzyme: Catalase found in chicken liver. * The name of the organism is chicken (liver). * The substrate is hydrogen peroxide (H2O2)|. * Hypothesis: If the catalase in the chicken liver is exposed to hydrogen peroxide, it will cause a chemical reaction. This reaction will result in the destruction of hydrogen peroxide in the chicken liver, which is harmful to the cells; the enzyme catalase works best in acidic solutions and enzymes are denatured in very high
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and pH take role inactivating the enzymes. To explain how this happens, the rates of enzymatic activity of salivaryamylase in varying temperatures and pHs were measured and compared. A plot in the end showsthe results and comparison. I. Introduction Enzymes are natural biological catalysts that speed up the reactions occurring in livingorganisms, both animals and plants. The use of a specific enzyme makes a typical metabolicreaction a million times faster. Enzymes are being designed specifically
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Unit 15 P5 PH report Hypothesis: the aim of this experiment was to see the effects that different levels of PH values has upon amylase enzyme activity. Apparatus: * Stirring rod * Dimple tray * Five pipettes * Syringe * Starch solution * Amylase * Iodine * Buffer of PH4, 7 and 10 * Test tube holder * Stopwatch Procedure: the first thing to do would be to ensure that you have all of the equipment needs for the experiment. The first step is to get a
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describe the special role of ATP in biological energy exchanges. Consider the importance of oxidation-reduction reactions in living cells, the energetic of electron-transfer reactions, and the electron carriers commonly employed as cofactors of the enzymes that catalyze these reactions. Reference Books 1. Lehninger, PPls of Biochemistry Fourth Edition David L Nelson and 2. Elementary Biophysics. An introduction. PK. Srivastave Alpha Science Oxford, UK 2005 3. Biophysics. V. Pattabhi
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Enzymes are biological catalysts. There are about 40,000 different enzymes in human cells, each controlling a different chemical reaction. They increase the rate of reactions by a factor of between 106 to 1012 times, allowing the chemical reactions that make life possible to take place at normal temperatures. They were discovered in fermenting yeast in 1900 by Buchner, and the name enzyme means "in yeast". As well as catalysing all the metabolic reactions of cells (such as respiration, photosynthesis
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Lab Report #2 Name: Lab: #9 Enzymes – Experiment #4 Due date: Purpose The purpose of the experiment is to compare and examine the effect of substrate concentration on catalase activity. Introduction All chemical reactions require a catalyst. A type of catalyst that exists is an enzyme, which acts to bring out a specific biochemical reaction. At all times, all work inside a cell is being performed by enzymes (Brian, 2000). The purpose of an enzyme is to help the cell carry out reactions
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