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LS1AFET 20121 | P a g eFACULTY OF SCIENCE/ WETENSKAP FAKULTEITDEPARTMENT OF BOTANY/ PLANTKUNDE DEPARTEMENTLS1AFETLIFE SCIE...
LS1AFET 20122 | P a g eQUESTION/VRAAG 1 [8]Choose the alternative that best completes the statement or answers the questio...
LS1AFET 20123 | P a g eacids./ een (1) gliserolmolekule veerbind aan een (1) fosfaatgroep en twee (2)vetsure.1.4 Mitosis o...
LS1AFET 20124 | P a g eQUESTION 2/ VRAAG 2 [10]Give the correct biological term for each of the following statements. Only...
LS1AFET 20125 | P a g e3.3 Sickle cell disease/ SekelselanemieAn inherited blood disorder, results from a single amino aci...
LS1AFET 20126 | P a g e4.2.2 List four (4) main properties of the molecule represented in the diagram above./ Lysdie vier ...
LS1AFET 20127 | P a g e 3. Expansion upon freezingWater is less dense as a solid than it is as a liquid, therefore ice fl...
LS1AFET 20128 | P a g e6.3 Draw and label an enlarged version of structure 4./ Teken en benoem ‘n vergrootteweergawe van s...
LS1AFET 20129 | P a g e7.1 Name the process that the cell in the diagram is undergoing./ Noem die proses watdie sel in die...
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Ls1 afet semester test 1 memo 2012

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Ls1 afet semester test 1 memo 2012

  1. 1. LS1AFET 20121 | P a g eFACULTY OF SCIENCE/ WETENSKAP FAKULTEITDEPARTMENT OF BOTANY/ PLANTKUNDE DEPARTEMENTLS1AFETLIFE SCIENCE 1A FET/ LEWENSWETENSKAP 1A FETAPK CAMPUS/ KAMPUSSEMESTER TEST 1/ SEMESTER TOETS 1 MEMORANDUM23 MARCH 2012/ 23 MAART 2012DATE/DATUM: 23 MARCH/MAART 2012SESSION/SESSIE: 08H00 – 09H35ASSESSOR: DR. M. COCHRANEINTERNAL/INTERNA MODERATOR MRS. J. WILLIAMSONDR. A. NELDURATION/TYD: 1½ HOURSTOTAL MARKS/TOTAAL: 90NUMBER OF PAGES: 6 PAGES/ AANTAL BLADSYE: 6 BLADSYEPlease read the following instructions carefully/ Lees asb. die volgende instruksiesversigtig deur:1. Answer all the questions in the question paper. / Beantwoord al die vrae in dievraestel.2. Answer ALL of the questions in the test book./ Beantwoord AL die vrae in dietoetsboek.3. Work neatly./ Werk netjies.4. Read your questions carefully./ Lees die vrae sorgvuldig deur.5. Good Luck./ Sterkte.
  2. 2. LS1AFET 20122 | P a g eQUESTION/VRAAG 1 [8]Choose the alternative that best completes the statement or answers the question. Onlywrite down the correct letter next to the appropriate question number in your answerbook./ Kies die alternatief wat die stelling die beste voltooi of die vraag beantwoord. Skryfslegs die korrekte letter langs die toepaslike vraagnommer op jou antwoordblad neer.1.1 Chitin ___________./Chitien _________A. forms part of the cell wall of woody plants./ vorm deel van die selwand van houtagtigeplante.B. has glucose monomers that contain a nitrogen containing appendage./ hetglukose monomere wat stikstof aanhangsels bevat.C. forms a subcutaneous (below skin) insulation layer to heat up animals in cold areas./vorm ‘n onderhuidse insulasie vetlaag om die diere in koue areas warm te hou.D. consists of polypeptides and range in length from a few to more than a thousand(1000) monomers./ bestaan uit polipeptiede en verskil in lengte vanaf ‘n paar tot meeras ‘n duisend (1000) monomere.1.2 Which one (1)of the following statements is not true about enzymes?/ Watter een (1)van die volgende stellings is nie waar aangaande ensieme nie?A. Enzymes are biological catalysts of metabolic processes./ Ensieme is biologiesekatalisators van metaboliese prosesse.B. Most enzymes are proteins./ Meeste ensieme is proteiene.C. Enzymes increase the speed of chemical reactions by lowering the activation energy./Ensieme verhoog die spoed van die chemiese reaksies deur die aktiverings energiete verlaag.D. Enzymes are inactivated and denatured by low temperatures./ Ensieme wordgeinaktiveel en gedenatureer by lae temperature.1.3 A phospholipid is composed of ___________./ ‘n Fosfolipied bestaan uit_____A. one (1) fatty acid molecule linked to three (3) glycerol molecules./ een (1)vetsuurmolekule wat gebind word aan drie (3) gliserolmolekules.B. one (1) glycerol molecule linked to three (3) phosphate groups./ een (1) gliserolverbind aan drie (3) fosfaatgroepe.C. one (1) fatty acid molecule linked to one (1) glycerol molecule and two (2) phosphategroups./ een (1) vetsuurmolekule verbind aan een (1) gliserolmolekule en twee (2)fosfaatmolekules.D. one (1) glycerol molecule linked to one (1) phosphate group and two (2) fatty
  3. 3. LS1AFET 20123 | P a g eacids./ een (1) gliserolmolekule veerbind aan een (1) fosfaatgroep en twee (2)vetsure.1.4 Mitosis occurs in ___________./ Mitose vind in _________________A. all somatic cells of plants./ alle somatiese selle van plante plaas.B. gametes./ gamete plaas.C. sperm cells./ spermselle plaas.D. all meristematic cells in plants./ alle meristematiese selle in plante plaas.1.5 The centrosome ___________./ Die sentrosoom __________A. connects the chromatids./ verbind die chromatiedes.B. is found in the chromatin./ word in die chromatien gevind.C. helps with mitosis in plant cells./ help met mitose in plantselle.D. consists of two (2) centriole./ bestaan uit twee (2) sentrioli.1.6 A deficiency of this vitamin causes Pellagra./ ‘n Te kort aan hierdie vitamienveroorsaak Pellagra.A. Vitamin/ Vitamien B1B. Vitamin/ Vitamien B2C. Vitamin/ Vitamien B3D. Vitamin/ Vitamien C1.7 A deficiency of which nutrient can cause prostate cancer?/ ‘n Te kort aan wattervoedingstof kan prostaatkanker veroorsaak?A. Zink/ SinkB. Sodium/ NatriumC. Iron/ YsterD. Calcium/ Kalsium1.8 Which nutrient is required for the proper functioning of the thyroid gland?/ Watttervoedingstof word benodig vir die behoorlike funksionering van die tiroiedklier?A. Zinc/ SinkB. Iodine/ JodiumC. Fluorine/ FluoorD. Magnesium
  4. 4. LS1AFET 20124 | P a g eQUESTION 2/ VRAAG 2 [10]Give the correct biological term for each of the following statements. Only write down thecorrect term next to the appropriate question number on the answer sheet./ Gee diekorrekte biologiese term vir elk van die volgende stellings. Skryf slegs die korrekte termlangs die toepaslike vraagnommer op die antwoordblad neer.2.1 Monomers of carbohydrates./ Monomere van koolhidrate. Monosaccharides2.2 The symptoms of this disease include a distended abdomen and an enlarged liver./Die simptome van hierdie siekte sluit ‘n opgeswelde abdomen en vergrote lewer in.Kwashiorkor2.3 Photograph of a cell taken under a microscope./ Foto wat onder ‘n mikroskoopgeneem is. Photomicrograph2.4 Structure in eukaryotic cells that produces rRNA./ Struktuur in ‘n eukariotiese sel watrRNA produseer. Nucleolus2.5 The process to form a disaccharide./ Die proses wat ‘n disakkaried vorm.Dehydration synthesis2.6 A condition caused by high levels of cholesterol in the blood./ ‘n Toestand watveroorsaak word deur hoë cholesterolvlakke in die bloed. Artherosclerosis2.7 A fibrous protein consisting of three (3) polypeptides coiled like a rope./’n Veselagtigeproteien wat uit drie (3) polipeptiede bestaan wat opgerol is soos ‘n tou. Collagen2.8 This scientist developed a microscope with one (1) lens./ Hierdie wetenskaplike het ‘nmikroskoop met een (1) lens ontwikkel. Anton van Leeuwenhoek2.9 The scientist who said that all cells can be traced back to their origin./ Hierdiewetenskaplike wat gesê het dat alle selle tot hul oorsprong terug gevind kan word.August Weismann2.10 The structure connecting the duplicated chromosome./ Die struktuur wat diegedupliseerde chromosome verbind. CentromereQUESTION 3/ VRAAG 3 [8]Provide a short definition for each of the following:/ Verskaf ‘n kort definisie vir elk van dievolgende:3.1 Hydrolysis/ HidroliseThe chemical breakdown of a compound by adding (or reaction with) water e.g.when starch is broken down by the process of hydrolysis (adding water) itforms several glucose molecules used for energy production.3.2 Adipose cells/ AdiposeselleFor cushioning around vital organs (shock absorption) - protection.
  5. 5. LS1AFET 20125 | P a g e3.3 Sickle cell disease/ SekelselanemieAn inherited blood disorder, results from a single amino acid substitution in theprotein hemoglobin.3.4 Activation energy/ AktiveringsenergieThe energy that must be added to molecules, to cause the molecules to reactwith one another.3.5 Substrates/ SubstrateAre the reactants which the enzyme must either help break up or help to bondtogether.3.6 Rickets/ RagitisDeforming of the bones in children due to a deficiency of calcium (Ca) andphosphorous (P).3.7 Prokaryotic cells/ Prokariotiese selleCells without a membrane bound nucleus e.g. bacteria, archaea.3.8 Metastasize/ MetastaseerExporting cancer cells to other parts of the body, where they may formsecondary tumors.QUESTION 4/ VRAAG 4 [18]4.1 Distinguish between glucose and glycogen./ Onderskei tussen glukose englikogeen. (4)GlycogenIs glucose stored in animals – storage in liver and muscle cellsIs a polysaccharideGlucoseIs a direct form of energy supplyIs a monosaccharide4.2 Study the diagram below and answer the questions that follow./ Bestudeer diediagram hieronder en beantwoord die vrae wat volg.4.2.1 What molecule is represented in the diagram above?/ Watter molekule word in diediagram hierbo voorgestel? (1)Saturated fat
  6. 6. LS1AFET 20126 | P a g e4.2.2 List four (4) main properties of the molecule represented in the diagram above./ Lysdie vier (4) eienskappe van die molekule wat in die diagram hierbo voorgestelword. (4)ANY 4 Solid/ hard fats at room temperature From animals like butter No double bonds between C-atoms – all carbons attached to hydrogens No kinks in carbon chains Cause atherosclerosis – cardiovascular complications4.3 Name three (3) components of nucleotides./ Noem drie (3) komponente vannukleotiedes. (3)Each nucleotide consists of a nitrogenous base, a pentose sugar, and a phosphate group4.4 Briefly describe a DNA molecule./ Beskryf die DNA molekule kortliks. (6) Has 2 polynucleotide chains Spiraling around an imaginary axis, forming a double helix Bases in DNA pair up Form hydrogen bonds: Adenine (A) always with thymine (T) Guanine (G) always with cytosine (C)QUESTION 5/ VRAAG 5 [8]5.1 List and describe the properties of water that contribute to Earth’s fitness for life./ Lysen beskryf die eienskappe van water wat daartoe bydrae dat lewe op Aarde moontlikis. 1. Cohesive behaviorContributes to upward water transport in plants by holding the watercolumn together. 2. Ability to moderate temperatureWater resists temperature changes when it absorbs or releases heat. Asa result water keeps temperature fluctuations within a range suitable forlife.
  7. 7. LS1AFET 20127 | P a g e 3. Expansion upon freezingWater is less dense as a solid than it is as a liquid, therefore ice floats.Prevents deep bodies of water from freezing solid from the bottom up.As water freezes it releases heat to the water below and insulates it.Makes the transitions between seasons less abrupt. 4. Versatility as a solventAble to dissolve a large variety of solutesQUESTION 6/ VRAAG 6 [22]Study the following diagram and answer the questions that follow./Bestudeer die volgendediagram en beantwoord die vrae wat volg.6.1 Is this a plant or animal cell? Give two reasons for your answer./ Is hierdie ‘n plant- ofdiersel? (3)Animal – no cell wall, no chloroplasts, no large central vacuole, centrosomepresent6.2 Provide a label and a function for structures numbered 1 – 5./ Verskaf ‘n byskrif en ‘nfunksie vir al die strukture wat 1-5 genommer is. (10)1: Nucleus – genetic information2: Plasma membrane – encloses cell3: Rough ER – membrane synthesis and metabolic processes4: Mitochondrion – respiration and ATP generation5: Golgi apparatus – active in synthesis & secretion of cell products
  8. 8. LS1AFET 20128 | P a g e6.3 Draw and label an enlarged version of structure 4./ Teken en benoem ‘n vergrootteweergawe van struktuur 4. (4)Heading: 1 markLabels: 3 marksFigure: Drawing of a mitochondrion6.4 Describe how oxygen and water would enter the cell above./ Beskryf hoe water ensuurstof die sel binne kan gaan. (5) Oxygen is a non-polar molecule It can dissolve in the lipid bilayer of the membrane and can cross without theaid of membrane proteins. Water is a polar molecule, needs the aid of proteins to get across themembrane. Hydrophyllic substances can avoid contact with the hydrophobic lipid bilayerby passing through transport proteins Aquaporins – channel proteins for the transport of waterQUESTION 7 [16]Study the following diagram and answer the questions that follow./ Bestudeer die volgendediagram en beantwoord die vrae wat volg.
  9. 9. LS1AFET 20129 | P a g e7.1 Name the process that the cell in the diagram is undergoing./ Noem die proses watdie sel in die diagram ondergaan. (1)Mitosis7.2 Which phase of the process in question 7.1 is depicted in the diagram?/ Watter fasevan die proses in vraag 7.1 word in die diagram voorgestel? (2)Teleophase7.3 Draw and label the phase that precedes the phase in the diagram. / Teken enbenoem die fase wat die fase in die diagram voorafgaan. (5)Heading: 1 markLabels: 2 marksDrawing: 2 marksFigure: Anaphase7.4 How many homologous chromosomes do humans have?/ Hoeveel homoloëchromosome het ‘n mens? (1)237.5 Describe what happens during interphase of the cell cycle. / Beskryf wat gebeurtydens interfase van die selsiklus. (4)Interphase includes:G1: growthS: DNA synthesis – chromosomes copiedG2: growth & prep for cell division7.6 Briefly discuss malignant tumours./ Bespreek kwaadaardige tumors kortliks. (3) Invade surrounding tissues and can metastasize Exporting cancer cells to other parts of the body, where they may formsecondary tumors. They do not exhibit anchorage dependence or density dependent inhibition.TOTAL/ TOTAAL: 90daughter chromosomekinetochore microtubule

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