Life Sciences Memo 1 (English)

November 2013 — Grade 12 / Matric — Life Sciences

Memo 2013 Grade 12 English Life Sciences Hub →

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1.1Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D\ next to the question number (1.1.1 to 1.1.10\ in the ANSWER BOOK, for example

1.1.1

1.1.2hich ONE of the following CORRECTLY describes the cells produced by meiosis CELLS PRODUCED BY MEIOSIS Chromosom omplement

1.1.3Study the following statements (i\ (ii\ (iii\ (iv\ rganisms in a population show a great deal of variation Characteristics are passed on from parents to offspring

1.1.4Study the following list of molecules (i\ (ii\ (iii\ (iv\ Sugar Phosphate Nitrogenous base Amino acid

1.1.5

1.1In humans, brown eye colour is dominant over blue eye colour. A mother with blue eyes had two children, a boy with brown eyes and a girl with blue eyes. The eye colour of the father is ... brown, b ecause the allele for brown eye colour is sex

1.1at i approximate RF value for i nse cticide

1.1Which ONE of the insecticides has the fastest killing action given that the same quantity of each insecticide was used? Insecticide A Insecticide B Insecticide C All the

1.1

1.1.10ers below refer to four populations of frogs. These populations are represented diagrammatically by circles. Overlapping circles show populations that are capable of interbreeding to produce fertile offspring

1.2Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.8\ in the ANSWER BOOK.

1.2.3The triplet of bases found in a tRNA molecule The condition where an organism has more than two complete sets of chromosomes in a cell A genetic disorder characterised by the absence of a blood clotting

1.2.6Organisms that have different alleles at a given locus The p hysical and/or functiona l expression of a gene An arrangement of black bars representing DNA fragments that can be use to determine whether people are related

1.2.8All the chromosomes found in a cell except the sex chromosomes The biotechnological production of ge netically identical offspring (8\ 2013

1.3Indicate whether each of the statements in COLUMN I applies to A ONLY B ONLY BOTH A AND B or NONE of the items in COLUMN II. Write only B only

1.3.1A trait such as height in humans that has a range of intermediate phenotypes Polygeni c inheritance Cod ominance

1.3.2Alternative forms of the same gene in a populatio Allele Chromosome

1.3.3A type of gene mutation in which adenine is lost/deleted from a DNA base triplet Frame shift muta nt muta

1.3.4The structure that moves chromosomes/chromatids to the poles during cell division entromer pind

1.3.5Inheritance of acquired characteristics Lamarck Darwin

1.3.6Influence the inheritance of blood groups ultiple a llele odominan

1.3.7haracteristic that humans share with other primates Opposable thumb Bin r visi

1.3.8A characteristic that is only expressed when in the homozygous state essi Dominant 8 x 2 (16\

1.4.1Using the letters and to represent the dominant and recessive alleles respectively, state the genotype of individual: (a\ (b\ (1\ (1\

1.4.3What is the percentage chance of individual having a genetic disorder? If individual marries an unaffected male, state the possible notype of their offspring.

2.1Study the diagram below which shows a section of a DNA molecule during a process taking place in a cell.

2.1.2ame the proc represented in th e diagram. hen exactly will this process take pla in (1\ (1\

2.1.4Give l s for State TWO ways in which the stru tur e of RNA differs from the DNA

2.2.1ame the stage of protein synthesis represented in the diagram above (1\

2.2.2Identif (a\ (b\ Mole ule Molec ule Struct (1\

2.2.3The tabl below shows the DNA base triple s that code for different amino acids found in human proteins AMINO ACID BASE TRIPLET IN DNA

2.3e diagram below show chromosom r 21 in leus of a cell of the ovary of a woman. The chromosome

2.3.2Give l s for Rearrange the letters to show the correct sequence in which the events take place in this phase. (2\ (1\ .3.4

2.4When flies with grey bodies were crossed with flies with black bodies, all the offspring in the F had grey bodies. Use the letters and to represent a genetic cross to show the F genotypes

3.1Read the extract below Genetic engineering involves a process whereby a gene is isolated from one organism and transferred into another organism . This gene can become part of the new host s genome. Usually

3.1.2What is meant by the term genome referred to in the extract State ONE way in which the genetic engineering described in the extract differs from selective breeding. (1\

3.1.3Give ONE reason why the products of genetic engineering must undergo many tests be fore they can be sold. (1\

3.1.5Explain the value of growing herbicide resistant crops. State THREE advantages of genetic engineering in crop production other than those mentioned in the extract above (3\ (3\ .1. a reason why se

4.1Although copper is an essential nutrient for the growth of plants, it is toxic and may kill the plants if present in very high amo unts. High amounts of copper in the soil may be a result of ore deposits from old

4.1.1Draw a line graph to represent the results obtained for the number of seedlings surviving in Group 1 (7\

4.1.2.1.3 Identify the dependent variable in the investigation. Identify TWO independent variables in this investigation. (2\ (2\ 15

4.1.4In terms of natural selection, explain why seedlings from seeds collected closer to the mine for Group 1 had a h igh survival rate. (17

4.2Describe how a study of the chromoso provides evidence for the Afri (3\ Describe the st uctural changes to the skull that characterise the evolution of modern humans from their

Topics Identified

Cell BiologyGeneticsEvolution

Mark Allocation

Total150 marks

Sections30 = 30 marks

Paper information

SubjectLife Sciences

Year2013

SessionNovember

TypeMemo

PaperPaper 1

LanguageEnglish

Pages15

Downloads4

Examination context

Decade2010s

Years ago13y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2013

Days since exam4,737

About Life Sciences examination preparation

Grade 12 Life Sciences combines biological knowledge with interpretation and scientific reasoning. Paper 1 covers molecular biology, genetics, and cell biology, while Paper 2 tests human physiology, ecology, and evolution.

Every available Grade 12 Life Sciences past paper and memorandum is collected in the Life Sciences hub at life-sciences.freemode.co.za — browse all years, sessions and languages in one place.

How to use this resource for revision

A past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

recalling biological concepts

applying knowledge to unfamiliar situations

interpreting diagrams and information

using scientific terminology

constructing precise written responses

A practical revision approach

Life Sciences rewards exact biological terminology — examiners deduct marks for paraphrased definitions. Create a glossary of key terms and practice using them in context.

Grade 12 subject hubs

Each matric subject has its own dedicated hub on Freemode with every past paper and marking memorandum we have archived for that subject.

➗ Mathematics View papers → 📊 Mathematical Literacy View papers → ⚗️ Physical Sciences View papers → 🧬 Life Sciences 📍 You are here 📒 Accounting View papers → 💼 Business Studies View papers → 📈 Economics View papers → 🌍 Geography View papers → 🏛️ History View papers → 📖 English View papers → 🇿🇦 Afrikaans View papers → 🗣️ IsiNdebele View papers → 🗣️ IsiXhosa View papers → 🗣️ IsiZulu View papers → 🗣️ Sepedi View papers → 🗣️ Sesotho View papers → 🗣️ Setswana View papers → 🌾 Agricultural Sciences View papers →

Corresponding examination paper

Examination paper available

Open the corresponding examination paper to practise the questions before reviewing the marking memorandum on this page. Attempt every question under timed conditions for the most realistic preparation.

Life Sciences Paper 1 (English) →

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