Life Sciences Grade 12 KZN March 2017 Paper & Memo

Education KwaZulu-Natal Department of Education REPUBLIC OF SOUTH AFRICA a A LIFE SCIENCES ; n COMMON TEST : f MARCH 2017 ‘ NATIONAL SENIOR CERTIFICATE MARKS: 60 TIME: 1 HOUR This question paper consists of 10 pages. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences 2 March 2017 Common Test NSC INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions: 10. 11. Answer ALL the questions. Write ALL the answers in the ANSWER BOOK. Start the answers to EACH question at the top of a NEW page. Number the answers correctly according to the numbering system used. in this question paper. Present your answers according to the instructions of each question. Make ALL drawings in pencil and label them in blue or black ink. Draw diagrams, flow charts or tables only when asked to do so. The diagrams in this question paper are NOT necessarily drawn to scale. Do NOT use graph paper. You must use a non-programmable calculator, protractor and a compass where necessary. Write neatly and legibly. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com | Life Sciences March 2017 Common Test Nsc SECTION A QUESTION 1 1.1. Various possible options are provided as answers to the following questions. Choose the correct answer and write only the letter (A - D) next to the question number (1.1.1 ~ 1.1.5) in the answer book, for e.g. 1.1.6 D. 1.1.1 A portion of DNA was found to have 120 guanine bases and 60 thymine bases. What is the total number of deoxyribose molecules in this portion of DNA? A 360 B 180 Cc 120 D 60 1.1.2 The diagram below represents a phase of meiosis. The next phase of meiosis will be ... A metaphase I. B metaphase II. Cc telophase l. D telophase Il. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences 4 NSC March 2017 Common Test Questions 1.1.3 and 1.1.4 refer to the graph below which shows the concentration of LH in the blood of a woman over a period of 28 days. Most fertile period Concentration of LH {arbitrary units) 0 = ee fe | 4 3 5 7 9 14 13 415 417 19 24 23 25 27 Time (days) 1.1.3. The process that occurs during the ‘most fertile period’ is ... A ovulation. B menstruation. Cc oogenesis. D implantation. 1.1.4 If the LH concentration reached its highest level on day 10 instead of day 13 then her most fertile period would be days ... A 12 to 14. B 11 to 13. c 10 to 12. D 9 to 11. Copyright Reserved Please Turn Over

Life Sciences Downloaded from hlayiso.com NSC March 2017 Common Test 1.1.5 The DNA profiles below show the DNA bands of a baby, the baby’s mother, the mother’s lover and her husband. baby mother | lover | husband | Us| cease cssuiaal el eae =e aE ot a] et a nn ae Ls] Ls] a | — ed a] = — ed Which ONE of the following statements is correct about who the father of the child is, with a corresponding correct reason? THE FATHER REASON A__| Husband All of baby's bands match his DNA profile B Husband Approximately 50% of the baby’s bands match his DNA profile Cc Lover Approximately 50% of the baby’s bands match his DNA profile D__| Lover All of the baby’s bands match his DNA profile Copyright Reserved (5 x 2)(10) TOTAL QUESTION 1: 10 TOTAL SECTION A: 10 Please Turn Over

Downloaded from hlayiso.com Life Sciences 6 March 2017 Common Test NSC SECTION B QUESTION 2 2.1 The diagram below represents a part of the process of protein synthesis. 2.1.1. Name the part of protein synthesis that is represented in the diagram. (1) 2.1.2 Tabulate TWO ways in which the process represented above differs from the process of DNA replication. (5) (6) Copyright Reserved : Please Tum Over

Downloaded from hlayiso.com Life Sciences 7 March 2017 Common Test NSC 2.2 The diagram below represents a process that occurs during meiosis. 2.2.1. Name the process represented in the diagram. (1) 2.2.2. Draw a diagram to show what the chromosome labelled B will look like at the end of this process. (3) (4) 2.3. The diagram below represents a bird with its chicks. wil 2.3.1. List TWO reproductive strategies visible in the diagram that are used by this species of bird. (2) 2.3.2 (a) Name the type of fertilization that occurs in this bird. (1) (b) — Explain why this type of fertilization allows for greater success in reproduction. (2) (5) TOTAL QUESTION 2: (15) Copyright Reserved Please Turn Over | i {|

Life Sciences QUESTION 3 Downloaded from hlayiso.com NSC March 2017 Common Test 3.1 The table below shows four amino acids and their corresponding anticodons. 3.1.1 Name the: AMINO ACID ANTICODON Leucine GAA Glycine ccu Glutamic acid - GUU Proline GGA (a) Molecule on which the anticodon is found (b) Process used to identify the amino acids required according to the sequence of codons on m-RNA 3.1.2 Give the codon for glutamic acid. (1) (1) 3.1.3 Use the DNA code provided below to determine the correct amino acid sequence from left to right. CCT-GGA-GAA (2) 3.1.4 Describe the effect on protein synthesis if the DNA code changed to the following: CCT-GGA-GGA Copyright Reserved (2) (7) Please Turn Over

Downloaded from hlayiso.com Life Sciences 9 March 2017 Common Test NSC 3.2 The diagram below shows several events that occur in the human female during reproduction. 3.2.1 Identify: (a) Structure A (1) (b) | The stage of embryo development represented by D (1) (c) | The process occurring at C (1) 3.2.2 (a) | Name the hormone produced by the structure labelled B. (1) (b) Describe the negative feedback mechanism between FSH and the hormone named in Question 3.2.2 (a). (2) 3.2.3 Explain ONE consequence if the level of the hormone named in Question 3.2.2 (a) decreases in a woman who is 7 weeks pregnant. (2) (8) TOTAL SECTION 3: (15) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences March 2017 Common Test NSC SECTION C QUESTION 4 Describe gametogenesis in human males, explain how the resulting cells are adapted to ensure successful fertilization and describe how abnormal meiosis can result in Down Syndrome. NOTE: NO marks will be awarded for answers in the form of flow charts or diagrams. Content (17) Synthesis: (3) TOTAL QUESTION 4: 20 TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright Reserved

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