PO Box 8‚ Sovereign Street‚ Leeds LS1 1HQ Kathleen Tattersall: Director General klm SECTION A Question 1 (a) GCE: Biology B – BYB4 June 2002 X = grana/lamellae/thylakoid (membranes); Y = stroma; NADPH2/ NADPH/ reduced NADP/reduced coenzyme; ATP; carbon dioxide/CO2; stroma; NOT “Y” production/breakdown of starch (or equivalent); 2 (b) 2 1 1 1 (c) (d) (i) (ii) Total 7 __________________________________________________________________________________ Question 2 (a)
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health. Diagram 1.1 show structural formula of ascorbic acid. Vitamin C is one of the quite famous vitamins among the vitamins. Due to the presence of vitamin C content in majority of fruits such as lemons‚ oranges‚ limes. Vitamin C also known as Coenzyme Q10 (CoQ10) which is disturb the activity of the free radical. Free radical can affect the cell membrane by alter it and change the structure of DNA.Free radical can increase risk of many health problem such as cancer and
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AND INHIBITORS 1. DESCRIBE THE GENERAL ROLE OF COFACTORS IN ENZYME ACTIVITY. Some chemicals enhance an enzyme’s activity‚ which is what cofactors function to do. They are a non-protein component of an enzyme and may be organic molecules (called coenzymes) or inorganic ions. 2. (A) NAME FOUR HEAVY METALS THAT ARE TOXIC TO HUMANS. Four heavy metals that are toxic to humans are: 1. Cadmium (Cd) 2. Lead (Pb) 3. Mercury (Hg) 4. Arsenic (As) (B) EXPLAIN IN GENERAL TERMS WHY THESE HEAVY METALS ARE
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chemical reactions occur without themselves being permanently altered by the reaction. Then‚ they increase the rate of reaction without adjusting the equilibrium between reactants and products. Throughout this process‚ water-soluble vitamins act as coenzymes to help catalyze chemical reactions. Hence‚ enzymes react by compressing the activation energy‚ thereby
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Introduction All tissues have some capability for synthesis of the non-essential amino acids‚ amino acid remodeling‚ and conversion of non-amino acid carbon skeletons into amino acids and other derivatives that contain nitrogen. However‚ the liver is the major site of nitrogen metabolism in the body. In times of dietary surplus‚ the potentially toxic nitrogen of amino acids is eliminated via transaminations‚ deamination‚ and urea formation; the carbon skeletons are generally conserved as carbohydrate
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Questions 1 HKALE 1990 Biology Paper II 1 HKALE 1993 Biology Paper II 1 HKALE 1996 Biology Paper II 1 HKALE 1999 Biology Paper II 1 Suggested Solution 3 HKALE 1990 Biology Paper II 3 HKALE 1993 Biology Paper II 4 HKALE 1996 Biology Paper II 6 Questions HKALE 1990 Biology Paper II 5. (b) Discuss the importance of carbohydrates‚ lipids‚ proteins and roughage in the human diet. (8 marks) Suggested Solution… HKALE 1993 Biology Paper II 6. Based upon its properties‚ discuss
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Trying To Discover The Underlying Source Code Of Sega’s Program’s? Does A Company have A right To Reverse Engineer Any Product It wants? Q9) In Your View Unocal Morally Responsible For The Injuries Inflicted On Some Of The Karen People? Explain? Q10) In Your View‚ does Utilitarianism Provide A More Objectives For Determining Right And Wrong Than Moral rights Do? Explain Your Answer Fully? Does Utilitarianism Provide A More Objectives Standard Than Principles Of Justice?
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Cellular respiration is the process that mainly important in our daily life and supply energy to your body. The main purpose is to turn food into usable chemical energy called ATP. Your body can use ATP as a source of energy to function. Cellular respiration is also the procedure by which cells in plants and creatures separate sugar and transform it into energy‚ which is then used to perform work at the cell level. The reason for cell breath is straightforward: it gives cells the vitality they have
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MANAVA BHARATI INDIA INTERNATIONAL SCHOOL Panchsheel Park (South)‚ New Delhi - 110017 SUMMER VACATION ASSIGNMENT 2012 CLASS – XII ENGLISH 1. Revise the lessons and poems done in the textbook ‘Flamingo’ and ‘Vistas’ and complete the written assignments. 2. Advanced writing skills: (a) Write an article of about 200 words on ‘The future of Information Technology’. (b) Draft creative posters on ‘Your New School Canteen’ and ‘Advantage of the Summer Season’. (c) Read the newspaper daily and gather
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In eukaryotes the reactions take place in the mitochondria. 6. The mitochondrial matrix is the space inside the inner membrane of the mitochondrion. 7. When pyruvic acid enters the mitochondrial matrix‚ it reacts with a molecule called coenzyme. b. The Krebs Cycle 1. The Krebs Cycle is a biochemical pathway that breaks down acetyl CoA‚ producing CO2‚ hydrogen atoms and ATP. 2. In the first of the Krebs Cycle‚ a two-carbon molecule of acetyl CoA combines with a four-carbon
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