undergo co-translational glycosylation on selected asparagine residues. To unite the alpha and beta polypeptide chains, intrapolypeptide disulfide bonds form; these events result in the formation of a catalytically active enzyme. In order to target the lysosome, where the enzyme operates, phosphomannosyl recognition markers need to be generated. They are formed by the sequential action of a phosphotransferase that add UDP-N-acetylglucosamine to selected mannose residues and a phoshpdiesterase a-N-acetylglucosaminidase
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Introduction Tyrosinase is an enzyme that controls the production of melanin, which is a pigment found in plants, animals, bacteria and fungi. Both tyrosinase and melanin is found in nearly all cells. Melanin is especially important in determining the skin and hair color of mammalians. It is synthesized by an array of oxidative reactions of the amino acid tyrosine when tyrosinase is present (Kim, Y. & Uyama, H., 2005). Tyrosine is first hydroxylated into dihydroxyphenylalanine (DOPA), which is then
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specifically listing the criteria by which you believe a substance may be considered “natural” as opposed to “unnatural.” A: I would say that HFCS is “unnatural” because HFCS is produced by using an enzyme (Alpha-amylase) to break down corn-starch. This leads me to ask why must we need the enzyme if it were “nature” Q: Both “natural” and genetically modified (GM) forms of corn are available in the United States. Based on the criteria that you have listed for Question 2, does your answer to
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Unit One: Biochemistry Organic chemistry: chemistry of carbon based molecules * Life on our planet is carbon based * All life is carbon based, so to understand how biological processes occur we need to consider organic chemistry Hydrocarbons: molecules that are entirely made from carbon and hydrogen * Carbon you can get a lot of shape (rings etc) * Mostly non-metals (hydrogen, carbon, oxygen etc) make up molecules in our cells * Hydrogen, carbon, nitrogen, oxygen
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Reducing Sugars Purpose: To better understand the biochemical composition of reducing sugars through qualitative observations and to determine if there is any presence of reducing sugars in the solution. Scientific Hypothesis: When reacting with Benedict’s reagent, reducing sugars will turn from blue to green, orange, or red-brown. Null Hypothesis: Reducing sugars and non-reducing sugars will not react with Benedict’s reagent. Predictions: 1. If water reacts with Benedicts reagent, then the
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dough to digest sugars that are resultant from starches in dough and produce carbon dioxide, causing the dough to rise. When making different cheeses milk bacteria gets digested with the milk sugar lactose and produces lactic acid, which acts with the enzyme rennet to curdle the milk. The whey then gets drained off and the curds get compressed together, which a variety of microbes then develop into actual cheese. Microorganisms used in cultured dairy products
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1. Which of the following is the characteristic of the living thing? A. have specific shape B. have regular shape C. have organized body D. none of the above 2. Which of the followings includes in homeostasis? a. To maintain the shaped of the body b. To maintain the balance of the body c. To maintain the temperature of the body d. To keep the animal away from the body 3. Your hearts starts beating before seven month of your birth. The study of your body at this stage comes within: (a)
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An enzyme is a globular protein functioning as a biological catalyst. An active site is the place on the surface of an enzyme to which substrate or substrates bind. 3.6.2 Explain enzyme–substrate specificity. The active site has a particular three-dimensional structure that corresponds to a specific substrate rather like a lock and key. 3.6.3 Explain the effects of temperature, pH and substrate concentration on enzyme activity. For all enzymes, there is an optimum temperature at which the
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Mark scheme January 2002 GCE Biology B Unit BYB1 The Assessment and Qualifications Alliance (AQA) is a company limited by guarantee registered in England and Wales 3644723 and a registered charity number 1073334 Registered address: Addleshaw Booth & Co., Sovereign House, PO Box 8, Sovereign Street, Leeds LS1 1HQ Kathleen Tattersall: Director General www.XtremePapers.net klm Question 1 (a) GCE: Biology B – BYB1 January 2002 Biuret reagent / Add NaOH and CuSO4; (ignore heated)
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consisting of sacs and vesicles that processes, packages, and distributes molecules about or from the cell Lysosomes- are membrane bounded vesicles produced by the golgi apparatus. Peroxisomes- a membrane bound vesicles that enclose enzymes. Vacuoles- membrane bround sacs 5. Energy related organelles: Mitochondria and Chloroplast. Basic idea about Photosynthesis. 6. The Cytoskeleton: names of different structures and their brief functions. Chapter 5 1. Membrane
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