Life Sciences Memo 2 (English)

November 2019 — Grade 12 / Matric — Life Sciences

Memo 2019 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 11 pages 📝 37 items found 📚 3 topics

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Q1— Section header —

1.1.9x 2\

1.2.8Uracil Punctuated equilibrium Extinction Australopithecus Ribosome Locus ibose Biotechnology x 1\

1.3.3Both A and B None B only 3 x 2\ (6\

1.4.1(a\ (b\ (c\ Centriole /centrosome Chromosome Cell membrane /plasma membrane/plasmalemma (1\

1.4.2(a\ (b\ (c\ Metaphase Prophase Anaphase (2\ (2\

1.4.3(a\ (b\ (c\ / 3 and 1

1.5.1(1\

1.5.2Normal leaf normal shape One seed per pod (2\

1.5(a\ (b\ PpLl x PpLl /PpLl ; PpLl (1\ TOTAL SECTION A:

Q2— Section header —

2.1.1(a\ (b\ tRNA /transfer RNA Anticodon (1\

2.1.2(a\ (b\ (in correct order\ TGG (in correct order\ (2\ (6\

2.2The double helix DNA unwinds and unzips /weak hydrogen bonds break to form two separate st One strand is used as a template to form mRNA using free RNA nucleotides from the nucleoplasm

2.3.1dominance he phenotypes /alleles of the parents are equally dominant (orange and yellow\ are both

2.3.2Black (1\

2.3.3In cross 1 both parents are yellow none of the parents are black but black appears in the phenotype of the offspring In cross 3 both parents are orange none of the parents are black

2.4Phenotype otted No ots Genotype Meiosis /gametes Fertilisation Genotype

2.4.1otted back (1\

2.4.2Spotted frogs produced offspring without spots The spotted offspring were three times more than offspring without spots / ratio of spotted offspring to offspring without spots is 3:1 (2\ 2019

2.5.1Type of antibiotic (1\

2.5.2Same: Environmental conditions /example mount of antibiotic oncentration of antibiotic ime of initial injection of antibiotics ge of the pig lets

2.5.3nvestigation was done over a period of six months Took many measurements alculated the average resistance Used a large sample size

2.5.4Antibiotic (1\

2.5.5The average percentage resistance of E.coli to antibiotic is lower than its resistance to antibiotic therefore more coli

2.5.6There was variation in the population of coli bacteria Some were resistant to antibiotic others were not resistant Those coli bacteria which were not resistant to antibiotic

3.1Skull 1 Skull 2 Brow ridges pronounced Brow ridges less pronounced More protruding jaws /prognathous Less protruding jaws

3.1Freely rotating arms Long upper arms Rotation around elbow joints Rotation around the wrists Opposable thumbs Bare fingertips / nails instead of claws Five fingers /pentadactyl limb

3.1Since the cranium houses the brain large cranial volume indicates a larger brain /more brain cells which suggests greater intelligence (3\ (14\

3.2.1alking on two legs (2\

3.2.2(a\ (b\ (c\ Foramen magnum moved to a more forward position to allow the spinal cord to

Q3— Section header —

3.4.1rossing over andom arrangement of chromosomes Random mating Random fertilisation Chromosomal mutation (Mark first THREE only\ (3\

3.4.2(a\ (b\ Mutant gene /Inherited from their ancestors Influenced by altitude level of oxygen (1\

3.4.3More haemoglobin present to allow for maximum absorption of the available oxygen More oxygen will be available to meet their energy needs (2\

3.4.4Originally the amount of red blood cells was similar in all humans /the Tibetans did not produce a large number of red blood cells As a result of the

Q4— Section header —

Topics Identified

Cell BiologyGeneticsEvolution

Mark Allocation

Total150 marks

Sections40 + 40 = 80 marks

Paper information

SubjectLife Sciences

Year2019

SessionNovember

TypeMemo

PaperPaper 2

LanguageEnglish

Pages11

Downloads5

Examination context

Decade2010s

Years ago7y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2019

Days since exam2,546

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 2 (English) →

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