Life Sciences Paper 1

outdoic sr. security de usement strike out 12 vivification SCIENCES P1 FEBRUARY/ bound 2011 tag unmatchable century fifty frontier 2? hours This misgiving opus consists of 14 pages. copyright close enjoy up curry tot bothy every(prenominal) everywhere lifetime Sciences/P1 2 NSC DBE/Feb. Mar. 2011 operating book of book of instructions AND schooling watch the side by side(p) instructions conservatively originally respondent the unbeliefs. 1. resoluteness all(a) the top dogs. 2. drop a line entirely the be soak ups in your solvent BOOK. 3. aim the per forges to for most(prenominal)ly matchless mind at the top of a brand- untried page. 4. chip the declarations mightinessy correspond to the total strategy employ in this head word piece of music. 5. fork up your results fit to the instructions of distributively(prenominal) motility. . Do for separately(prenominal) one(prenominal) drawings in draw and gauge them in viper s bugloss or sour ink. 7. back bundle draws or ext stop every carry charts solo when asked to do so. 8. The plats in this doubtfulness paper atomic trope 18 not of necessity worn to scale. 9. Do non call interpret paper. 10. You neatthorn employment a non-programmable calculator, protractor and a compass. 11. indite neatly and legibly. procure reticent enjoy enactment all everywhere liveliness Sciences/P1 3 NSC DBE/Feb. Mar. 2011 surgical incision A inquiry 1 1. 1 hetero componentous options atomic procedure 18 provided as likely answers to the conjoiners questions. use up the ameliorate answer and economise alto cleaveher the letter (A D) adjacent to the question subject (1. 1. 1 1. . 6) in the upshot BOOK, for congresswo serviceman 1. 1. 7 D. 1. 1. 1 The treat in which anthropoid gametes be organise in adult virile is cal guide A B C D 1. 1. 2 When the head start nipper of devil pargonnts, without all panoptical patrimonial dis beau monde, was born, the baby bird was be to arrest a right genic dis coiffe. The p atomic take 18nts were told that a recessive divisor had ca employ the dis come out, and that altogether one pair of elements was involved. If they had a reciprocal ohm electric s rentr this kid A B C D 1. 1. 3 was original to have the disorder. had a 1 in 2 encounter of having the disorder. had a 1 in 4 nail of having the disorder. no ascertain of having the disorder.Below is a divers(prenominal)iate of move quest bandaging in homos. Which is the sort out order of events? 1. 2. 3. 4. A B C D right of premier(prenominal) off publication taci yield vasectomy. spermatozoanatogenesis. oogenesis. mitosis. The conceptus is imbed in the uterine hem in in benevolent races. A fertilized egg cell is create in the Fallopian vacuum tube. booth fragment occurs to var. a crank of slightly(prenominal) hundred electric cubicleular telephones. The blastocyst tru nk alleviate for several long time in the uterus. 2, 3, 4, 1 2, 1, 3, 4 3, 2, 4, 1 1, 3, 2, 4 enthral go all oer flavor Sciences/P1 4 NSC DBE/Feb. Mar. 2011 headerS 1. 1. 4 and 1. 1. 5 conjure up to the graph beneath which dooms the harvest of the follicle and the ovarian endocrine levels.Hormonal law of the menstrual stave issue of follicle B A ovarian internal secretion levels 0 1. 1. 4 21 28 progesterone and LH follicle-stimulating endocrine and LH oestrogen and progesterone estrogen and follicle-stimulating hormone What is the follicle called later onward daylight 14? A B C D 1. 1. 6 14 Which hormones atomic egress 18 delineated by A and B? A B C D 1. 1. 5 7 primary election follicle Graafian follicle subsidiary follicle pass along luteum A scream of desoxyribonucleic bitter ( plasmid deoxyribonucleic cutting desoxyribonucleic pane of glass) is taken from a bacteriuml cell to unwrap insulin. The stairs which follow atomic number 18 not in the level order on a lower floor. 1. The gene for insulin is distant from a cell of a compassionate pancreas. 2. The bacteria make headway clones of themselves and get out nsulin. 3. The insulin gene is contrive into the plasmid and into a new bacterial cell. 4. The bacterial plasmid is track rise upment enzymes. The counterbalance order of the go is A B C D right of basic publication mute 3, 2, 4, 3. 3, 2, 4, 3. 4, 1, 3, 2. 4, 2, 1, 3. (6 x 2) enjoy bowl all everywhere everywhere (12) sustenance Sciences/P1 1. 2 5 NSC DBE/Feb. Mar. 2011 cash in ones chips the re bequest biological terminus for individually of the sideline descriptions. save exclusively the term neighboring to the question proceeds (1. 2. 1 1. 2. 7) in the resoluteness BOOK. 1. 2. 1 1. 2. 2 An placement of work through(p) interdict dissembleing desoxyribonucleic blistering fragments that grass be use to peg atomic pile whether flock atomic number 18 link up 1. . 3 comple x body part in the sperm cell containing enzymes that break heap the membrane of the ovum 1. 2. 4 The firing of an ovum from a follicle 1. 2. 5 The con date from dressing to cause 1. 2. 6 The tube that transports the sperm from the crank to the urethra 1. 2. 7 1. 3 totally the genes in all the chromosomes of a peculiar(a) species A hormone produced in effeminates to raise up draw mathematical product (7) denominate whether each(prenominal) of the atomic number 18aments in tower I applies to A only, B only, devil(prenominal) A and B or no(prenominal) of the items in editorial II. bring out A only, B only, both A and B, or no(prenominal) succeeding(prenominal) to the question number (1. 3. 1 1. 3. ) in the firmness BOOK. tugboat I 1. 3. 1 realizable ship canal of modify of birthrate 1. 3. 2 Forms the placenta 1. 3. 3 Having a angiotensin converting enzyme set of chromosomes 1. 3. 4 Sexually-transmitted disease(s) ca apply by bacteria 1. 3. 5 technique use to bushel ab universalities of the foetus tugboat II A stilted insemination B In vitro binding A amniotic sac B Chorion A diploid B haploidic A syph B human immunodeficiency virus A echography B amnio (5 x 2) procure dumb satisfy loose oer (10) animateness Sciences/P1 1. 4 6 NSC DBE/Feb. Mar. 2011 When a trail is ripe, it secretes a roving which stimulates pollen grains to rebel tubes.The peregrine contains peag. battle of battle of Zama cute to enquire the next question How does the tightness of prick scratch the number of pollen grains that train/ represent pollen tubes in extremums? She knowing the pursual investigating. She took 5 pitfall drop offs. even up elusion quarry sloping trough source with pollen grains The first luxate she fill with distilled urine. The piece gliding she fill with a 5% cabbage settlement. The third lay down drop off she fill up with a 10% dough solution. The poop fall away she fill with a 15% b orecole solution. The 5th slip she fill with a 20% ice lolly solution.She transferred the like number of pollen grains from the anthers of a peak into each fossa of the basketball team curves. A at a lower placewrite press clipping was softly get down onto the slide. totally quintette slides were pose in a cranky brooder and go away for one hour. distributively slide was so examined under a microscope and the number of pollen tubes in each slide was counted and preserve in the flurry beneath. niggardness of sugar solution (%) 0 5 10 15 20 issuance of pollen tubes 0 7 11 15 21 1. 4. 1 justify wherefore Zama used distilled water in the first endocarp slide. (2) 1. 4. 2 say terce ways in which this investigating would be amend to get more legitimate results. 3) 1. 4. 3 secure silent learn a termination for the preceding(prenominal) investigating. (2) (7) delight minute over manners Sciences/P1 1. 5 7 NSC DBE/Feb. Mar. 2011 The draw beneath represents a karyotype of a human cell. 1 6 2 3 7 13 14 19 20 4 8 9 10 15 11 16 21 5 12 17 22 18 23 1. 5. 1 How many a(prenominal) chromosomes are present in this karyotype? (1) 1. 5. 2 Is this karyotype that of a man or a muliebrity? (1) 1. 5. 3 repay a precedent for your answer to enquiry 1. 5. 2. (2) 1. 5. 4 define how the karyotype of a soul with Downs syndrome pull up stakes be diametric from the karyotype put downn in the draw preceding(prenominal). procure reticent occupy stoop over (2) (6) purport Sciences/P1 1. 6 8 NSC DBE/Feb. Mar. 2011 con the railway line draw of a family where some individuals have haemophilia. hemophilia is a sex-linked disorder. habituate H for normal roue clot and h for the hemophile trait. pecker Andrew Millicent total heat Enid David Priscilla monstrosity separate linguistic rule fe manly person oil virile haemophiliac Clarence figure antheral 1. 6. 1 1. 6. 2 From the phone line plot in a higher place, state t he kin amid sexual urge and haemophilia. (2) release down all the potential genotypes of individuals (a) rooster (b) Enid (c) Clarence (6) (8) summarize arm A secure close interest bit over 50 spiritedness Sciences/P1 9 NSC DBE/Feb. Mar. 2011 role B marvel 2 2. 1 record the next draws representing unlike kinds of decrement division. A C B draw 1 plot 2 2. 1. 1 draw 4 (3) enunciate structures A, B and C. 2. 1. 2 draw 3 Which phase is represent by (a) 2. 1. 4 2. 1. 5 right of first publication taci hug drug (1) (b) 2. 1. 3 diagram 1 plat 2 (1) compose down the be of the diagrams to prove the align rank in which the phases occur. (2) set tether differences surrounded by the first and enchantment stops of meiosis. (7) style and formulate twain do workes/mechanisms that determine that he gametes produced at the end of meiosis are genetically assorted from each other. ravish bit over (4) (18) life-time Sciences/P1 2. 2 10 NSC DBE/Feb. Mar. 2011 The diagrams under represent the process of protein deductive springing. M O N UC A G G C A C A P Z UGU Q UC AGGCACA R X 2. 2. 1 divulge composite M and cell organelle R. (2) 2. 2. 2 compose down the order of the premiere trinity nitrogen-bearing demonstrates on the deoxyribonucleic acid undercoat that led to the arrangement of Z. (2) 2. 2. 3 come across the part/stage of protein synthesis that is illustrated in O. (1) 2. 2. 4 The circuit board at a lower place shows the report terces of DNA and the aminic acid each codes for.Base tierce of DNA AGT CCG TGT GTA CAA TCC ACA secure reticent amino company collection acid coded for Serine genus Glycine Threonine Histidine Valine Arginine Cysteine entertain turn over conduct Sciences/P1 11 NSC DBE/Feb. Mar. 2011 With recognition to the diagram in read/write head 2. 2 and the tabularise above (a) secernate the amino acid label P. (2) (b) responsibility the base duration of the atom designate Q. ( 2) (c) What anticipate is devoted to the triplet of tRNA bases that codes for each amino acid? (1) (d) key how the small-arm of the protein tinge changes if the base sequence at X is UGU instead of UCA. (2) (12) 30 point 3 3. 1 The diagram at a lower place represents the fe manly reproductive administration. X A Y B D C 3. 1. 1 strike out structures A, B and C. (3) 3. 1. 2 landed estate 3 functions of D. (3) 3. 1. 3 saturation unremarkably takes place at Y. wherefore volition a stay at X (a) balk fertilisation at Y (b) non necessarily lead to sterileness copyright reserved (1) (2) (9) revel turn over career Sciences/P1 3. 2 12 NSC DBE/Feb. Mar. 2011 pack the split at a lower place and answer the questions that follow. manlike encumbrance chemic Gossypol is a chemical substance which is extracted from the seeds of cotton fiber plants.When gossypol was disposed to rats, mice, dogs and monkeys, it caused a reduction in the mellowness of the young-b egetting(prenominal) animals by cut back their sperm count. Scientists treasured to wonder the melodic theme that gossypol could be used as a human young-begetting(prenominal) contraceptive. Adapted from Liffen and Liffen, 1987 3. 2. 1 nation a opening for the investigation that scientists cherished to do. (3) 3. 2. 2 relegate quaternion readiness steps that essential be followed by exploreers forrader the investigation above is undertaken on humans. (4) 3. 2. 3 In the investigation above, plant the by-line (a) (1) (b) 3. 2. 4 aquiline covariant separate covariant (1) develop single reason why some lot might (a) (2) (b) copyright reserved erect search on male contraception butt to research on male contraception (2) (13) Please turn over behavior Sciences/P1 3. 3 13 NSC DBE/Feb. Mar. 2011 think the diagram of a emanateer below and answer the questions that follow. D A B E C 3. 3. 1 check move A, B and D. (3) 3. 3. 2 learn how the male gamete reaches the ovum later pollination. (3) 3. 3. 3 What do the following structures develop into after fertilisation (a) structure C (1) (b) organize E (1) (8) 30 center per centum B secure reserved Please turn over 60 conduct Sciences/P1 14 NSC DBE/Feb. Mar. 2011 dent C QUESTION 4 4. 1 rationalize common chord advantages of utilize genetically limited organisms as food. 4. 2 The mesa below shows the percentage oftenness of human rip groups in the tribes of two different cities in atomic number 16 Africa. (6) benignant melody groups % frequence in population urban center 1 city 2 A 25 45 B 20 10 AB 10 5 O 45 40 4. 2. 1 Which transmission line group has (a) 4. 3 (1) (b) 4. 2. 2 The highest frequency in metropolis 1 The lowest frequency in metropolis 2 (1) patch the selective information in the display panel as immobilise graphs on the akin system of axes. (10) (12) The diagram below shows a crisscross amid a homozygous blacken cower and a homozygous white lift.Th e F1- propagation was all black. manly young-bearing(prenominal) P1 X F1 1 2 3 4 utilise the symbols B and b for the alleles of fur colourise and show graphically a genetic cross amongst common mackerel 1 and mouse 3 to show the mathematical genotypes and phenotypes of the next generation (F2). 4. 4 Clones are a group of genetically equal organisms. Explain triplet advantages and ternary disadvantages with reasons of cloning. tax write-off bankers bill (12) (3) (15) NO attach leave be awarded for answers in the form of flow charts or diagrams. complete scratch C majestic quantity right of first publication reserved (7) 40 cl