Life Sciences Grade 12 KZN March 2016 Paper & Memo

Basic Education REPUBLIC OF SOUTH AFRICA i LIFE SCIENCES i COMMON TEST aa MARCH 2016 KwaZulu-Natal Department of Basic Education NATIONAL SENIOR CERTIFICATE GRADE 12 MARKS: 60 TIME : 1 hour This question paper consists of 8 pages. Copyright Reserved M3 Please turn over

Downloaded from hlayiso.com NSC Life Sciences Common Test March 2016 INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions: 1. Answer ALL the questions. 2. Write ALL the answers in the ANSWER BOOK. 3. Start the answers to EACH question at the top of a NEW page. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Present your answers according to the instructions of each question. 6. Make ALL drawings in pencil and label them in blue or black ink. ( ) 7. Draw diagrams, flow charts or tables only when asked to do so. 8. The diagrams in this question paper are NOT necessarily drawn to scale. 9. Do NOT use graph paper. 10. You must use a non-programmable calculator, protractor and a compass where necessary. 11. Write neatly and legibly. Copyright Reserved Please turn over

Downloaded from hlayiso.com Life Sciences Common Test March 2016 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. The following statements may / may not occur when an mRNA strand is formed. (i) DNA replicates (ii) DNA unwinds (iii) | DNA acts as a template (iv) | MRNA is formed on the complementary strand of DNA (v) RNA nucleotides pair off with the DNA molecule Which of the following is correct when an mRNA strand is formed? A. (ii); (ili); (v) B. (i); (ii); (ii); (iv); (v) Cc. (ii); (iii); (iv) D. (i); (tii); (v) 1.1.2 Which ONE of the following is CORRECT with regard to the structure of DNA and RNA? RNA is double-stranded and DNA is single-stranded. DNA forms a double helix while RNA does not. RNA contains deoxyribose sugar while DNA contains ribose sugar. RNA is a very long molecule while DNA is a short molecule. GDOW>PY 1.1.3 How many amino acids make up a portion of a protein if the number of nitrogenous bases on the DNA molecule that codes for that portion of the protein is 120? A. 3 B. 20 Cc. 60 D. 420 Copyright Reserved Please turn over M3

Life Sciences NSC Downloaded from hlayiso.com 1.1.4. The DNA profiles shown below are from a family with four children. PARENT | PARENT | CHILD 1 | CHILD 2 | CHILD 3 | CHILD 4 1 2 been a al De | a | a a a eee 0 | Se bel a Leal bal a a a a [eel Le el be a mn a a | ] a — | enna! ee | a a ee Which ONE of the children in the family is adopted? GCoOWP NAR 1.1.5 The difference between spermatogenesis and oogenesis is that ... A. all 4 cells formed in both become haploid sperm and ova. only 1 haploid sperm and 4 haploid ova is / are formed, haploid ovum. B. Cc. 4 cells become haploid sperm cells and only 1 cell forms a D 4 diploid sperm cells and 1 diploid ovum is / are formed Copyright Reserved M3 (5 x 2) Common Test March 2016 (10) TOTAL QUESTION 1: [10] TOTAL SECTION A: [10] Please turn over

Downloaded from hlayiso.com Life Sciences Common Test March 2016 NSC SECTION B QUESTION 2 2.1. The diagram below represents a nucleic acid. Zz 2.1.1 Identify: ) (a) X (1) (b) Z (1) 2.1.2 Give TWO reasons why DNA replication is important in cells. (2) 2.1.3 During what phase of the cell cycle does DNA replication take place? (1) 2.1.4 Identify the nitrogenous base, labelled W, in the diagram. (1) 2.1.5 Describe the type of error at V on the diagram. (2) (8) Copyright Reserved Please turn over M3

Downloaded from hlayiso.com NSC Life Sciences Common Test March 2016 2.2. The diagrams below represent part of the process of protein synthesis. Arginine Lysine Leucine Valine Molecule X Organelle Y Part of process of protein synthesis 2.2.1 Name the process that is represented in the diagram (1) 2.2.2 Identify each of the following molecules: (a) X (1) (b) Z (1) 2.2.3. Give each of the following: (a) The codon for lysine. (1) (b) — The anticodon for valine. (1) (c) DNA base triplet for arginine if the anticodon for it is UCA. (1) 2.2.4 Ifthe next three bases (to the right) on molecule Z is UUC then what will the next amino acid in the chain be? (1) (7) TOTAL QUESTION 2: (15) Copyright Reserved Please turn over M3

Downloaded from hlayiso.com NSC Life Sciences Common Test March 2016 QUESTION 3 3.1. The diagram below represent a phase of the process of meiosis. 3.1.1 How many chromosomes will be present in this cell at the end of the cell division? (1) 3.1.2 (a) | Name the phase of meiosis that occurs immediately before the phase shown in the diagram. (1) (b) Describe events that take place in the phase of meiosis identified in QUESTION 3.1.2(a). (2) 3.1.3 State TWO ways in which genetic variation is introduced during meiosis. (2) 3.1.4. The process shown in the diagram produces male and female gametes in a human being. Describe the process involved when these gametes fuse during sexual reproduction. (4) (10) Copyright Reserved Please turn over M3

Downloaded from hlayiso.com Life Sciences Common Test March 2016 NSC 3.2. The information provided below explains how seahorses reproduce. The reproductive process begins when a male and a female seahorse do daily pre-dawn dances, intertwining their tails and swimming together. Eventually they engage in a true courtship dance, which can last as long as eight hours. It ends with the female depositing her eggs in the male's pouch which is on his stomach. The eggs are then fertilized in the dad's pouch. The eggs hatch in the pouch. The father cares for the young in his pouch as they grow, regulating the water salinity in the pouch to prepare them for life in the sea. When the tiny seahorses are ready to be born, the male undergoes muscular contractions to expel the young, known as "fry," from the pouch. The fry then swim away to live on their own. Adapted from :news.nationalgeographic.com 3.2.1 List THREE reproductive strategies used by seahorses. (3) 3.2.2 Explain ONE way how the seahorses improve the chances that the eggs will be successfully fertilized. ; (2) (5) TOTAL QUESTION 3: (15) SECTION C QUESTION 4 Describe the role of hormones in the ovarian and uterine cycles when a woman falls pregnant. NOTE: NO marks will be awarded for answers in the form of flow. charts or diagrams. Content: 17 Syntesis: 3 TOTAL QUESTION 4: (20) TOTAL SECTION C: (20) GRAND TOTAL: [60] Copyright Reserved M3

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LIFE SCIENCES Downloaded from hlayiso.com 5 NSC-MEMORANDUM March 2016 Common Test Marks for synthesis Criterion | Relevance (R) Logical sequence (L) | Comprehensive (C) Generally | All information provided | Ideas are arranged ina | All aspects required by is relevant to the topic _| logical/cause-effect the essay have been sequence sufficiently addressed In this Only information The role of hormones in | Information provided essay relevant tothe = the events of the should include correct foamones invowwed In ovarian and uterine content from each of e ovarian and uterine . oo cycles of the menstrual oveles and preanancy the following sections: cycle and pregnancy are described In a ; are discussed. There is | logical sequence. Ovarian cycle and NO irrelevant Uterine cycle 7/11 - information provided. Pregnancy 3/6 € ) | Mark 4 4 4 ak we * *Copyrigth reserved TOTAL QUESTION 4: — [20] TOTALSECTIONC: — [20] GRAND TOTAL: [60]

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