Biology paper 1&2 core evolution,chemestryof life, population, enzymes, adn, photosyntesis 11dp dic 2011
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This document contains information about a Biology Standard Level exam for a student, including: - The exam is divided into two papers, Paper I lasting 1 hour 30 minutes on Tuesday December 6th, 2011. - Paper I contains multiple choice questions about topics like the t-test, scatter graphs, molecular structures, DNA replication, and population genetics. - Paper II contains free response questions about topics like the effects of temperature on molluscs, population ecology, enzyme structure and function, and evidence for evolution.
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Biology paper 1&2 core evolution,chemestryof life, population, enzymes, adn, photosyntesis 11dp dic 2011
- 1. Name Student: Biology Standard Level Paper I& II 1 hour 30 minutes Tuesday 06 December 2011 INSTRUCTIONS TO CANDIDATES Do not open this examination paper until instructed to do so. Answer all the questions. Answer all in the spaces provided. Use pen only Use clear handwriting Paper I Puntos Nota 20-20 7 17-19 6 14-16 5 12-13 4 8-11 3 4-7 2 1-3 1 Paper II Puntos Nota 36-36 7 30-35 6 25-29 5 19-24 4 12-18 3 6-11 2 0-5 1 Paper I 1. The t-test is used to test the statistical significance of a difference. What is that difference? A. Between observed and expected results EJE 1 All statements baccalaureate international 2011 ©
- 2. B. Between the means of two samples C. Between the standard deviation of two samples D. Between the size of two samples 2. What does the following scatter graph show? A. No correlation between these variables B. Strong positive correlation between these variables C. Strong negative correlation between these variables D. Weak negative correlation between these variables 3. Which molecule is shown below? EJE 2 All statements baccalaureate international 2011 ©
- 3. A. Glucose B. Galactose C. Ribose D. Sucrose 4. What is replicated by a semi-conservative process? A. Messenger RNA (mRNA) only B. Messenger RNA (mRNA) and transfer RNA (tRNA) only C. Messenger RNA (mRNA), transfer RNA (tRNA) and DNA only D. DNA only 5. If 15 % of a sample of DNA is thymine, what percentage of the DNA is guanine? A. 15 % B. 30 % C. 35 % D. It cannot be determined from the information given. 6. On which molecule is a codon found? A. Polypeptide B. mRNA C. tRNA D. rRNA EJE 3 All statements baccalaureate international 2011 ©
- 4. 7. Which of the following processes produces CO2? I. Glycolysis II. Alcohol (ethanol) fermentation III. Lactic acid production A. I only B. II only C. I and II only D. I, II and III 8. The following diagram shows part of a food web from Yellowstone Park. What would be the short-term effects on the populations of the other species if the gray wolf were exterminated? 9. Which process tends to reduce variety within a population? A. Natural selection EJE 4 All statements baccalaureate international 2011 ©
- 5. B. Random fertilization C. Independent assortment D. Crossing over 10. The diagram below shows a population growth curve. At which time in the population growth curve does the population size begin to decline? A Between the time marked 1 and 2 B. During the time marked 2 C Between the time marked 2 and 3 D. The graph does not show a time when population size declines 11. Population growth, as shown by the curve below, is the result of changes in mortality, natality, EJE 5 All statements baccalaureate international 2011 ©
- 6. immigration and emigration. Which of the following statements about population growth is correct? A. In phase I there is no mortality. B. In phase II mortality equals natality and immigration equals emigration. C. In phase II mortality and emigration are less than natality and immigration. D. In phase III mortality and emigration are less than natality and immigration 12. Which process is used in polymerase chain reaction (PCR)? A. Transcription B. Translation C. Replication D. Mutation 13. Which enzymes are needed to incorporate genes into plasmids to create recombinant plasmids? A. DNA polymerase and ligase B. DNA polymerase and restriction enzymes C. Restriction enzymes and ligase D. Helicase and restriction enzymes 14. What could be achieved by DNA profiling using gel electrophoresis? A. The chromosome number of an organism could be counted. EJE 6 All statements baccalaureate international 2011 ©
- 7. B. It could be shown that human tissue found at the site of a crime did not come from a person suspected of having committed the crime. C. A karyotype could be produced. D. Extinct species of living organisms could be brought back to life. 15. Which of the following colours of light is absorbed the most by chlorophyll? A. Blue B. Green C. Yellow D. Orange 16. What is light energy used for during photosynthesis? A. To produce carbon dioxide B. To produce water molecules C. To produce ATP D. To break down sugar molecules 17. Which diagram represents the polarity of a water molecule? 18. Which of these molecules is a disaccharide? EJE 7 All statements baccalaureate international 2011 ©
- 8. A. Galactose B. Sucrose C. Cellulose D. Ribose 19. What is a codon? A. A sequence of nucleotides on rRNA that corresponds to an amino acid B. A sequence of nucleotides on mRNA that corresponds to an amino acid C. A sequence of nucleotides on tRNA that corresponds to an amino acid D. A sequence of nucleotides on DNA that corresponds to an amino acid 20. What happens as an enzyme becomes denatured? A. The enzyme works faster. B. The enzyme works slower. C. The enzyme can perform a new role. D. The enzyme can make the reverse reaction proceed faster Paper II EJE 8 All statements baccalaureate international 2011 ©
- 9. Models predict global warming will cause sea temperatures to rise by approximately 2 °C by 2100. An investigation was carried out to study the effect of slight increases in temperature on the ability of Antarctic marine molluscs to carry out basic activities essential for survival. The graph below shows the effect of temperature on the percentage of limpets (Nacellaconcinna) able to right themselves after being turned over. a. Outline what the two parts of the scientific name Nacellaconcinnarefer to. [1] ......................................................................... ......................................................................... b. State the relationship between temperature and the percentage righting in N. concinna[1] ......................................................................... ......................................................................... c. Estimate the percentage change of N. concinnaable to right themselves when the temperature is raised from 0 ºC to 2.5 ºC. [1] ......................................................................... ......................................................................... . (This question continues on the following page) (Question 1 continued) EJE 9 All statements baccalaureate international 2011 ©
- 10. d. At present, the maximum summer temperature in the normal Antarctic environment of this organism is 1ºC. Suggest what might be the effect on the survival of this organism ifthe predicted rise in sea temperature due to global warming occurs.[2] ......................................................................... ......................................................................... ......................................................................... ......................................................................... 2. a. Define population. [1] ......................................................................... ......................................................................... b. Draw a box diagram to show the effects of natality, mortality, immigration and emigration on a population [5] ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... c. State three factors that set limits to population growth. [3] ......................................................................... ......................................................................... ......................................................................... 3.a. Define enzyme and active site. [2] EJE 10 All statements baccalaureate international 2011 ©
- 11. ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... b. Explain enzyme–substrate specificity [3] ......................................................................... ......................................................................... ......................................................................... ......................................................................... c. State one role for each of the elements [5] Sulphur Calcium Iron Sodium Phosphorus EJE 11 All statements baccalaureate international 2011 ©
- 12. Section B 4. Explain two examples of evolution as a response to environmental change. [6] ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... 5. Outline the evidence for evolution provided by homologous structures. [6] ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... EJE 12 All statements baccalaureate international 2011 ©