Tuesday, December 11, 2018

'Paper Ib\r'

'REVISION 2 (56 Marks) IB type take aim Biology Dulwich College nobble Topic 3: alchemy of Life 3. 1Chemical elements and piddle 3. 1. 1 recount that the some frequently occurring chemical elements in live things atomic number 18 carbon, heat con disco biscuitt, type O and nitrogen. 3. 1. 2 suppose that a variety of new(prenominal) elements be needed by livelihood organisms, including sulphur, atomic number 20, phosphorus, iron and sodium. 3. 1. 3State iodine comp hotshotnt for each of the elements in 3. 1. 2. 3. 1. 4Draw and label a draw showing the organize of peeing whits to show their polarity and hydrogen stupefy formation. 3. 1. abstract the thermal, cohesive and solvent properties of pee. 3. 1. 6Explain the relationship amidst the properties of irrigate and its uses in living organisms as a coolant, mass medium for metabolic reactions and transport medium. 3. 2 lollys, Lipids and Proteins 3. 2. 1Distinguish surrounded by thorough and inorganic com pounds. 3. 2. 2Identify aminic acids, glucose, ribose and fatty acids from diagrams showing their organise. 3. 2. 3List triad specimens of each of monosaccharides, disaccharides and polysaccharides. 3. 2. 4State one go away of glucose, lactose and glycogen in animals and of fructose, sucrose and carrelulose in plants. . 2. 5Outline the role of condensation and hydrolysis in the relationships amongst monosaccharides, disaccharides and polysaccharides; mingled with fatty acids, glycerine and triglycerides; and between aminic acids and polypeptides. 3. 2. 6State leash functions of lipids 3. 2. 7Compargon the use of carbohydrates and lipids in push storage. Paper 1 threefold Choice (7 Marks) 1. Which is not a primary function of protein molecules? A. Hormones B. slide fastener storage C. Transport D. grammatical construction 2. Which of the following could be a function of a tissue layer protein? A. Energy storage B. enzymatic activity C. Oxygen pulmonary tuberculosis D. Thermal insulation 3.What is the utmost number of fatty acids that drive out be condensed with glycerol? A. wiz B. Two C. Three D. 4 4. What is a role of carbohydrates in animal cells? A. As take for passive transport B. As enzymes C. As strength storage D. As components of the animal cell wall 5. Which of the following monetary value correctly describe the molecule below? I. Monosaccharide II. Ribose III. Carbohydrate A. I only B. I and III only C. II and III only D. I, II and III 6. What causes water system to wee a relatively juicy boiling point? A. total heat bonds between water molecules B. henry bonds between hydrogen and group O at heart water molecules C.Cohesion between water molecules and the container in which the water is boiled D. Covalent bonds between hydrogen and oxygen within water molecules 7. Identify the atoms and ions from the dishearten below. AtomsIons A. H+Na+OHâ€Cl†B. FeKCH3COOâ€H2O C. FeH2OCa2+N3 †D. NaCIâ€NO3 †Paper 2 fragment A information Analysis (7 marks) 1. Scientists have yen been concerned about the set of heavy metals in foods that we eat. aquatic filter feeders including bivalves, such as mussels and oysters, argon especially flat to accumulation of heavy metals. atomic number 20 is taken into bivalves through protein channels, and new(prenominal) non-essential elements may likewise be taken in.To check the relationship between the use of calcium and other elements, the bivalves Hyridella depressa and Velesunio indeterminate were placed in solutions containing ten times the normal level of calcium (Ca). The elements manganese (Mn), pick out (Pb), cadmium (Cd) and cobalt (Co) were overly present in the solutions at normal concentrations. The results ar shown below. [Source: Reprinted from Markich Scott J. and Jeffree Ross A. , â€Å" acculturation of divalent trace metals as analogues of calcium by Australian freshwater bivalves: an explanation of how water hardness redu ces metal perniciousness”, Aquatic Toxicology (August 1994), vol. 9, issue 3â€4, pp. 257â€290, © 1994 with permission from Elsevier] ? (a)(i)Outline the effect of change magnitude calcium levels in the water on calcium levels in the tissue of the bivalves. (1) (ii)Outline the effect of increase calcium levels in the water on metals other than calcium in the tissue of the bivalves. (1) (b)Suggest reasons for the do of calcium on the levels of the other metals in the tissues. (2) (c)Evaluate the implications of these results for monitoring water quality in regions where bivalves are harvested. (3) Paper 2 Section A Short integrated (20 Marks) 1.The complex structure of proteins seat be explained in impairment of four levels of structure, primary, secondary, 3rd and quaternary. (a)Primary structure involves the sequence of amino acids that are bonded together to form a polypeptide. State the name of the gene linkage that bonds the amino acids together. (1) (b)Beta p leated sheets are an casing of secondary structure. State one other modeling. (1) (c)Tertiary structure in globular proteins involves the folding of polypeptides. State one type of bond that stabilizes the tertiary structure. (1) (d)Outline the quaternary structure of proteins. (2) 2.State one named example of a fibrous protein and one named example of a globular protein. (2) 3. State two functions of proteins with a named example of each. (2) 4. Lipids are essential nutrients that essential be included in the diet. (a)State one food replete in lipids suitable for a vegan diet. (1) (b)Outline two functions of lipids in the body. (2) (c)Discuss the mathematical health problems associated with diets rich in lipids. (4) 5. Living organisms produce a wide variety of organic compounds. (a)Define the term organic. (1) Organic compounds are made of chemical elements, which are therefore essential to living organisms. b)State the three most commonly occurring elements. (1) (c)Some org anic compounds contain other elements. State one substance, or group of substances, that contains (i) nitrogen, (ii) phosphorus. (2) Section B Extended Response (22 Marks) 1. Outline the role of condensation and hydrolysis in the relationship between amino acids and dipeptides. (4) 2. Explain the secondary and tertiary levels of protein structure. (4) 3. Describe why carbohydrates and lipids are used as energy stores. (6) 4. Explain, with reference to its properties, the significance of water as a coolant, a means of transport and as a habitat. (8)\r\n'

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