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June 2003

GCE A AND AS LEVEL

MARK SCHEME MAXIMUM MARK: 40

SYLLABUS/COMPONENT: 9700/01 BIOLOGY Paper 1 (Multiple Choice)

Page 1

Mark Scheme A/AS LEVEL EXAMINATIONS – JUNE 2003

Syllabus 9700

Paper 1

Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Key D A C C A C D A B A B C B C D A D A C C

Question Number 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Key D B B A C C B B C D A C C D B B D B B C

TOTAL 40

© University of Cambridge Local Examinations Syndicate 2003

June 2003

GCE A AND AS LEVEL

MARK SCHEME MAXIMUM MARK: 50

SYLLABUS/COMPONENT: 9700/02 BIOLOGY Paper 2 (Theory 1)

Page 1

Mark Scheme A/AS LEVEL EXAMINATIONS – JUNE 2003

Syllabus 9700

Paper 2

KEY a semi colon ; an oblique line / R A AW underlined with a straight line D L Q indicates a separation of marking points indicates alternative wording or acceptable alternative means reject means accept means 'alternative wording' accept this word only, no alternative word is acceptable represents quality mark(s) awarded for diagrams, as indicated on the Mark Scheme represents mark(s) awarded for labels on diagrams, as indicated on the Mark Scheme represents quality of expression and is used for marks awarded on free-response questions

© University of Cambridge Local Examinations Syndicate 2003

Page 2

Mark Scheme A/AS LEVEL EXAMINATIONS – JUNE 2003

Syllabus 9700

Paper 2

Question 1 (a) (b)

Expected Answers C, E, D, B; centromeres have divided/duplicated; R. split R. replicated (sister) chromatids/(daughter) chromosomes pulled/moved/ separate/migrate to (opposite) poles; ref. to the spindle/microtubules/spindle fibres; R. fibres replication/DNA synthesis; assembly of nucleotides/polynucleotide (chain) formed; (alongside) old/original/both strands, act as template; by base/complementary pairing/ A-T and G-C; quantity of DNA doubles/two new double helices formed; production of genetically identical cells/genetically uniform cells/ identical DNA/maintains genetic stability/same number and kind of c-somes/no genetic variation;

Marks 1

max 2

(c)

max 3

(d)

1

[Total 7]

2 (a)

Award one mark per column. No penalisation for complete lack of all crosses (or all ticks) unless mixture of x and ü missing as agreed emphysema x x x x ü tuberculosis x ü x x ü or x obesity x x ü x x rickets x x ü ü x smallpox ü ü or x x x x

statement eliminated by vaccination a worldwide infectious disease a form of malnutrition a deficiency disease involves degeneration of lung tissue

[Total 5]

© University of Cambridge Local Examinations Syndicate 2003

Page 3

Mark Scheme A/AS LEVEL EXAMINATIONS – JUNE 2003

Syllabus 9700

Paper 2

3 (a)

Correct letter order on Question Paper: A - nucleus; C - mitochondria; B - RER; D - Golgi apparatus; E - cell surface membrane; max 4 R. process statements instead of letters

(b)

secrete/release/produce/make antibodies; A. immunoglobulins R. memory cells unless linked to antibody production

1

(c)

nucleus/nuclear envelope/nuclear membranes/nucleolus; no cell wall; have organelles/named visible organelles; (golgi/mitochondrion/ RER) R. more organelles larger (cell); fixed ribosomes/ribosomes attached to E.R./no free ribosomes; max 2 [Total 7]

4 (a)

(i)

shade in xylem; (complete xylem star must be shaded)

1 1 1

(ii) shade in phloem; (A. shading of just one phloem group) (b) ref to bending/provide support/strength; R. lignin unqualified R. prevents collapsing

(c)

osmosis/diffusion; down water potential gradient/from high/less negative to low/more negative water potential/AW; (R. osmotic potential/conc. gradients/ less or more) through partially/selectively/differentially permeable membrane; R. semi-permeable max 2 transpiration pull/cohesion-tension/cohesion-adhesion/ mass flow in xylem; into spongy mesophyll (cells); many cell...
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