life sciences Memo 1 (Afrikaans) version 2

Feb-March 2012 — Grade 12 / Matric — life sciences

Memo 2012 Grade 12 Afrikaans Life Sciences Hub →

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🎯 150 marks 📄 15 pages 📝 59 items found 📚 2 topics 🔑 1 key info

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Q1— Section header —

1.1

1.1.1During which ONE of the follo wing stages does replication of DNA

1.1.2

1.1.3A nitrogenous base found only in RNA is ...

1.1.4If an analysis of DNA from ce lls in a human body showed that thymine made up 15% of the nucl eotide bases, then the percentage

1.1.5

1.2.8The shape of a DNA molecule before DNA replication cells of the same organism The complete set of an organism's genes moving it into the cells of another organism

1.2

1.2.1Unspecialised cells which are capabl e of giving rise to any other The disease caused by uncontrolled division of cells The process of finding a desirabl e gene, isolating it and then An arrangement of DNA fragments

1.3Indicate whether each of the st atements in COLUMN I applies to A ONLY BOTH A and B or of the items in COLUMN II. Write A only B only both A and B next to the question num

1.3.1Have a single set of chromosomes A: Haploid

1.3.2The number, shape

1.3.3An individual that one recessive allele for a particular characteristic

1.3.4Sudden changes in the genetic make up of an B: Mutation

1.3.5Carry genetic material A: Genes B: Chromosomes

1.3.6The genotype of blood group AB A: I (6 x 2\ NSC body temperature.

1.4.4What was the temperature of the woman on day 15? occurred. Explain the importance of the hig 15 to day 20.

1.4The two graphs below show the changes in temperature in a woman's body and the levels of the hormones oestr ogen and progesterone during the menstrual cycle. The release of the ovum takes place when there is a rise in

1.4.1By how many degrees Celsius did her temperature vary between days 13 and 15? Show ALL working. From the graph, state TWO factors that indicate that ovulation her level of progesterone from day Oestrogen Progesterone

1.5.1and are not indicated.

1.5.2(4) (12)12

1.5It is possible to trace the inheritance of characteristics such as blood groups The pedigree diagram below shows the blood groups of individuals of a family. The blood groups are i ndicated inside the circle or the

Q2— Section header —

2.1.4and respectively.

Q2— Section header —

2.2(b) Transcription Translation

2.1The diagram below repr esents a process taking place during meiosis.

2.1.1Label parts Name the process in meiosis that is illustrated in the diagram During which phase of meiosis does the process named in The following questions are based on protein synthesis.

2.2.1Define each of the following: (a\ (2\ C B A D Diagram representing a process taking place during meiosis NSC

2.2.2The diagram below shows the sequence of nitrogenous bases of a strand of DNA which codes for part of a protein molecule. Write down the mRNA codon sequenc e that reads from left to right (3\

2.2.3The diagram below shows the ant icodons of nine different tRNA (transfer RNA\arrying a particular amino acid. From the diagram above select a nd write down the amino acids (in the correct sequence\ GLYCINE

2.3.4mouse and mouse respectively? If mice

2.4Explain:

2.4.2The principle of codominance Mendel's law of segregation (3) (6) [30]30

2.3Study the diagrams be low that show breeding experiments on mice. A single pair of alleles showing comple te dominance controls coat colour

2.3.1Which sex chromosomes would be present in the gametes of and had a second set of offspring, what is the t mouse born would be female? Which of the parent mice ( or

2.4.1(3\ Female FemaleMaleMale 1 2 3 NSC 10

Q3— Section header —

3.1.5Label and

Q3— Section header —

3.1Study the diagrams below and answ er the questions that follow.

3.1.1respectively. Write down the LETTER and NAME of the part where sperms are Explain why it is necessary for part to 'hang outside' the body of Name the following: (a\ The hormone that stimulates the development of secondary

3.1.6During a vasectomy, part is surgically cut. (a\ Will it be possible for a man who is HIV positive to pass the Human male reproductive system NSC 11

3.2regard to phenotypes: are taller than girls.

3.2.2considered in this investigation. below. (3)3

Q3— Section header —

3.3.2number of chromosomes. (2) (4)4

3.3Study the table below which shows the relationship between the age of a (years\ Risk of Down syndrome baby 25 35

3.3.1State the relationship between the mother's age and the chance of having a baby with Down syndrome. Explain why a person with Down syndrome has an abnormal NSC 13 SECTION C

Q4— Section header —

4.1.3Draw TWO line graphs on the same to 1998. diseases.

4.1Some sexually transmitted diseases The table below indicates the num ber of people infected with two common Year Number infected with syphilis Number infected with gonorrhoea 1986 50 150 1990 150 280

4.1.1system of axes to compare the number of people infected with sy philis and gonorrhoea from 1986 Describe the trends shown in the graph for EACH of the two All sexually active people should be compelled by law to get an

4.2.4What process takes place at the woman's uterus. Explain ONE advantage of pr oducing many embryos.

4.2The diagram below illustrates what happens during in vitro fertilisation (IVF\

4.2.1Give TWO reasons why a coupl e may not be able to have children normally. In IVF more embryos are produc ed than can be implanted in State ONE way in which IV F differs from cloning. (1\ Woman Man Embryo

4.3Write a mini-essay in which you explain how any THREE contraceptive methods prevent human pregnancy. You should also explain ONE way in Content: NOTE: NO marks will be awarded for answers in the form of flow

Topics Identified

Cell BiologyGenetics

Mark Allocation

Total150 marks

Sections30 + 30 = 60 marks

Per-question sum259 marks

Key Information

Contact Number0135140145 · 0155160165

Paper information

Subjectlife sciences

Year2012

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageAfrikaans

Pages15

Downloads6

Examination context

Decade2010s

Years ago14y

Season—

Start day—

Exam period—

Days since exam—

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.

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