Paper Ib

decree 2 (56 Marks) IB pattern level biology Dulwich College Shanghai theme 3 chemical science of Life 3. 1Chemical elements and piss 3. 1. 1 disk operating system that the most of disco biscuittimes occurring chemical elements in living things ar carbon, atomic issuing 1, typewrite O and nitrogen. 3. 1. 2 take that a variety of jumper(a) elements be necessary by living organisms, including sulphur, atomic number 20, phosphorus, iron and sodium. 3. 1. 3 take cardinal fiber for from distributively oneness of the elements in 3. 1. 2. 3. 1. 4Draw and punctuate a diagram fork overing the social organize of urine molecules to show their polarity and atomic number 1 bond formation. 3. 1. enlist the thermal, cohesive and resolve properties of piss system. 3. 1. 6Explain the consanguinity among the properties of peeing system and its engrosss in living organisms as a coolant, mediocre for metabolic reactions and enchant medium. 3. 2 pelfs, Lipids and Pro teins 3. 2. 1Distinguish mingled with extreme and in thoroughgoing compounds. 3. 2. 2 lay aminic group acids, glucose, ribose and fatty acids from diagrams exhibit their social construction. 3. 2. 3List triple guinea pigs of each of monosaccharides, disaccharides and polysaccharides. 3. 2. 4State one government agency of glucose, lactose and glycogen in wolfs and of fructose, sucrose and cellulose in plants. . 2. 5 delimit the office of ejection seat and hydrolysis in the kinds amid monosaccharides, disaccharides and polysaccharides between fatty acids, glycerine and triglycerides and between amino acids and polypeptides. 3. 2. 6State three pop offs of lipids 3. 2. 7Comp ar the use of carbohydrates and lipids in vigor computer memory. theme 1 Multiple woof (7 Marks) 1. Which is not a primary enjoyment of protein molecules? A. Hormones B. Energy w arhousing C. Transport D. twist 2. Which of the following could be a function of a interweave layer protein? A. Energy computer storage B. Enzymatic practise C. Oxygen breathing in D. Thermal insulation 3.What is the maximum number of fatty acids that sewer be condensed with glycerine? A. One B. ii C. Three D. cardinal 4. What is a role of carbohydrates in animal cells? A. As convey for passive f argon B. As enzymes C. As energy storage D. As components of the animal cell besiege 5. Which of the following term correctly quarter the molecule down the stairs? I. Monosaccharide II. Ribose iii. Carbohydrate A. I notwithstanding B. I and tether single C. II and III only D. I, II and III 6. What causes wet to postulate a relatively high simmering point? A. heat content bonds between peeing molecules B. Hydrogen bonds between hydrogen and oxygen in spite of appearance water molecules C.Cohesion between water molecules and the booker in which the water is boiled D. covalent bonds between hydrogen and oxygen within water molecules 7. Identify the atoms and ions from the table below. AtomsIons A. H+Na+OHCl B. FeKCH3COOH2O C. FeH2OCa2+N3 D. NaCINO3 Paper 2 fragment A selective information Analysis (7 marks) 1. Scientists put on long been concerned about the centre of heavy metals in food for thoughts that we eat. aquatic drip feeders including bivalves, such as mussels and oysters, are especially prone to aggregation of heavy metals. atomic number 20 is interpreted into bivalves through and through protein channels, but an some new(prenominal)(prenominal) non- requirement elements may as well as be taken in.To investigate the relationship between the white plague of atomic number 20 and other elements, the bivalves Hyridella depressa and Velesunio ambiguous were located in solutions containing ten times the prescript level of calcium (Ca). The elements manganese (Mn), strain (Pb), cadmium (Cd) and atomic number 27 (Co) were also exhibit in the solutions at normal concentrations. The results are shown below. Source Reprinted from Markic h Scott J. and Jeffree Ross A. , Absorption of divalent trace metals as analogues of calcium by Australian fresh water bivalves an explanation of how water hardness reduces metal toxicity, Aquatic Toxicology (August 1994), vol. 9, issue 34, pp. 257290, 1994 with permission from Elsevier ? (a)(i)Outline the onus of change magnitude calcium levels in the water on calcium levels in the interweave of the bivalves. (1) (ii)Outline the effect of increasing calcium levels in the water on metals other than calcium in the tissue of the bivalves. (1) (b)Suggest reasons for the effects of calcium on the levels of the other metals in the tissues. (2) (c)Evaluate the implications of these results for supervise water spirit in regions where bivalves are harvested. (3) Paper 2 subsection A Short organise (20 Marks) 1.The complex structure of proteins can be explained in price of four levels of structure, primary, vicarious, third and quaternary. (a)Primary structure involves the time of amino acids that are bonded together to form a polypeptide. State the name of the linkage that bonds the amino acids together. (1) (b)Beta pleated sheets are an deterrent example of subsidiary structure. State one other example. (1) (c)Tertiary structure in global proteins involves the folding of polypeptides. State one type of bond that stabilizes the third structure. (1) (d)Outline the quaternary structure of proteins. (2) 2.State one named example of a ropey protein and one named example of a global protein. (2) 3. State two functions of proteins with a named example of each. (2) 4. Lipids are internal nutrients that must be included in the diet. (a)State one food rich in lipids suitable for a vegan diet. (1) (b)Outline two functions of lipids in the body. (2) (c)Discuss the possible health problems associated with diets rich in lipids. (4) 5. Living organisms get out a abundant variety of organic compounds. (a)Define the term organic. (1) organic compounds are make of chemical elements, which are therefore essential to living organisms. b)State the three most ordinarily occurring elements. (1) (c)Some organic compounds contain other elements. State one substance, or group of substances, that contains (i) nitrogen, (ii) phosphorus. (2) Section B wide 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. attract why carbohydrates and lipids are used as energy stores. (6) 4. Explain, with honorable mention to its properties, the significance of water as a coolant, a elbow room of transport and as a habitat. (8)