Post on 12-Apr-2018
transcript
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Commentary on candidate evidence Candidate 1
The evidence for this candidate has achieved the following marks for each question of this Course Assessment component.
Question 1
The candidate was awarded 2 marks.
(a) 1 mark
(b) 0 marks – No mention is given of embryonic stem cells.
(c) (i) 1 mark
(ii) 0 marks
Question 2
The candidate was awarded 2 marks.
(a) 1 mark
(b) (i) 0 marks – Answer is wrong. A frameshift mutation involves a base or
nucleotide being inserted or deleted. It is a splice-site mutation that involves the
retention of introns.
(ii) 0 marks
(c) 0 marks
(d) 1 mark
Question 3
The candidate was awarded 5 marks.
(a) 1 mark – Quantity is too vague a term in comparison to volume, mass or
concentration.
(b) (i) 2 marks – One zero at the origin means candidate is not penalised for no
zero on the vertical axis scale.
(ii) 0 marks
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(iii) 1 mark – Use more dishes implies repeating the investigation.
(c) (i) 0 marks
(ii) 0 marks
(iii) 1 mark
Question 4
The candidate was awarded 2 marks.
(a) 1 mark
(b) 0 marks
(c) 1 mark
(d) 0 marks – The lack of ATP for the next stage is not what results in the
reaction going backwards. It is the increase in fructose-6-phosphate
concentration which causes this.
(e) 0 marks
Question 5
The candidate was awarded 5 marks.
(a) (i) 1 mark
(ii) 1 mark – ‘It’ must refer to creatine phosphate as this is what the question is
about and creatine phosphate is given in the stem of the question.
(b) 1 mark
(c) 2 marks – ‘Quick bursts of activity’ does not gain a mark as candidates need
to indicate ‘contraction’ over a short period.
Question 6
The candidate was awarded 1 mark.
(a)(i) 0 marks
(ii) 1 mark
(iii) 0 marks
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(b) 0 marks
Question 7
The candidate was awarded 5 marks.
(a) 1 mark
(b) 1 mark
(c) 1 mark
(d) 2 marks – ‘Fit and work out’ indicates that the celebrities promote exercise.
Question 8
The candidate was awarded 5 marks.
(a) 1 mark
(b) 1 mark
(c) 0 marks – Although the candidate has correctly worked out the answer, they
have entered the wrong figure in the answer line.
(d) (i) 1 mark
(ii) 1 mark
(iii) 1 mark
Question 9
The candidate was awarded 0 marks.
(a) 0 marks
(b) 0 marks
(c) 0 marks
Question 10
The candidate was awarded 1 mark.
(a) 1 mark – ‘two separate groups’ does not indicate related information
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being grouped together.
.
(b) 0 marks
(c) 0 marks
Question 11
The candidate was awarded 2 marks.
(a)(i) 2 marks – Candidate gives a description of vasodilation.
(ii) 0 marks
(b) 0 marks
Question 12
The candidate was awarded 2 marks.
(a) 1 mark
(b) 1 mark
(c) 0 marks
(d) 0 marks
Question 13
The candidate was awarded 2 marks.
(a)(i) 0 marks
(ii) 1 mark
(iii) 1 mark
(b) 0 marks
(c) 0 marks
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Question 14
The candidate was awarded 8 marks.
(B)(i) 3 marks for mentioning points 1, 3, and 4.
Note the mark for point 2 is not given as impulses at the AVN do not cause
the atria to contract. It is impulses from the SAN which do this.
(ii) 5 marks for mentioning points a, b, c, d, e and f.
Total mark
The evidence for this candidate has achieved an overall mark of 42 for the paper.
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Candidate 2
The evidence for this candidate has achieved the following marks for each question of this Course Assessment component.
Question 1
The candidate was awarded 3 marks.
(a) 1 mark
(b) 1 mark
(c) (i) 1 mark – Answer indicates that stem cells are grown (in a lab?) after being
taken from the patient’s muscle.
(ii) 0 marks
Question 2
The candidate was awarded 0 marks.
(a) 0 marks
(b) (i) 0 marks
(ii) 0 marks – Note candidate cannot be given credit for giving the correct
answer for part (i) here.
(c) 0 marks
(d) 0 marks
Question 3
The candidate was awarded 4 marks.
(a) 0 marks – Incubator set to same time is unclear. Answer should have said set
to same temperature or dishes left in incubator for the same time.
The yeast answer should specify mass, volume or concentration.
(b) (i) 1 mark – Candidate loses 1 mark as the label on the X-axis is not
identical to the table and the scale on this axis is incorrect as the distance
from the origin to 10 is half the size it should be. Points are correctly
plotted and the line correctly drawn.
(ii) 0 marks
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(iii) 0 marks
(c) (i) 1 mark
(ii) 1 mark – The wording conveys that there are more yeast cells when SPF
15 is used.
(iii) 1 mark
Question 4
The candidate was awarded 2 marks.
(a) 1 mark
(b) 0 marks – Answer does not indicate lowering of activation energy.
(c) 0 marks
(d) 1 mark
(e) 0 marks
Question 5
The candidate was awarded 4 marks.
(a)(i) 0 marks
(ii) 0 marks
(b) 1 mark
(c) 3 marks – ‘But for a long period of time’ refers to contraction.
Question 6
The candidate was awarded 2 marks.
(a)(i) 0 marks
(ii) 1 mark
(iii) 1 mark
(b) 0 marks
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Question 7
The candidate was awarded 3 marks.
(a) 1 mark
(b) 1 mark
(c) 0 marks
(d) 1 mark – The internalisation answer does not indicate either persuasion or the
source of persuasion.
Question 8
The candidate was awarded 2 marks.
(a) 1 mark
(b) 0 marks
(c) 1 mark
(d) (i) 0 marks
(ii) 0 marks
(iii) 0 marks
Question 9
The candidate was awarded 0 marks.
(a) 0 marks
(b) 0 marks
(c) 0 marks
Question 10
The candidate was awarded 2 marks.
(a) 1 mark
(b) 0 marks
(c) 1 mark
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Question 11
The candidate was awarded 2 marks.
(a)(i) 1 mark – Answer does not indicate that it is capillaries which become more
permeable. In addition capillaries do not vasodilate.
(ii) 0 mark – Pathogens do not undergo apoptosis. Answer must indicate that it
is the infected cell which does this.
(b) 1 mark
Question 12
The candidate was awarded 1 mark.
(a) 1 mark
(b) 0 marks
(c) 0 marks
(d) 0 marks – ‘great spike’ does not indicate the steepest part of the graph. It
suggests an increase followed by a decrease.
Question 13
The candidate was awarded 3 marks.
(a)(i) 0 marks – the answer does not convey an equal mix of genders in each
group.
(ii) 1 mark
(iii) 1 mark
(b) 0 marks
(c) 1 mark
Question 14
The candidate was awarded 10 marks.
(A)(i) 6 marks for mentioning points 1, 2, 3, 4, 6, 7 and 8.
(ii) 4 marks for mentioning points a, b, c, e, and f.
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Candidate 3
The evidence for this candidate has achieved the following marks for each question of this Course Assessment component.
Question 1
The candidate was awarded 4 marks.
(a) 1 mark
(b) 1 mark
(c) (i) 1 mark – The mark is awarded as placing stem cells into the area to repair
the tissue indicates that the area refers to the damaged muscle tissue.
(ii) 1 mark
Question 2
The candidate was awarded 5 marks.
(a) 1 mark
(b) (i) 1 mark
(ii) 1 mark – Note the additional guidance indicates that a ‘shortened
polypeptide chain’ is correct if linked to stop codon in part (b)(i).
(c) 0 marks
(d) 2 marks – The sex-linked answer implies that it is the carrier female who
passes the condition to her son.
Question 3
The candidate was awarded 5 marks.
(a) 1 mark – Quantity is too vague a term compared to volume, mass or
concentration of yeast. Type of UV used suggests using the same lamp.
(b) (i) 2 marks – Note the scale on the X-axis just uses half the graph paper.
(ii) 1 mark – Damage to a cell’s DNA indicates cell damage increasing.
(iii) 0 marks – Repeating the result is wrong. The answer must refer to
repeating the investigation / experiment.
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(c) (i) 0 marks
(ii) 0 marks
(iii) 1 mark
Question 4
The candidate was awarded 3 marks.
(a) 1 mark
(b) 0 marks
(c) 1 mark
(d) 0 marks
(e) 1 mark – ‘Excess ATP not produced’ implies the ATP is not required.
Question 5
The candidate was awarded 5 marks.
(a) (i) 1 mark
(ii) 0 marks
(b) 1 mark
(c) 3 marks
Question 6
The candidate was awarded 0 marks.
(a)(i) 0 marks
(ii) 0 marks
(iii) 0 marks
(b) 0 marks
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Question 7
The candidate was awarded 3 marks.
(a) 1 mark
(b) 1 mark
(c) 0 marks – candidate does not mention height squared.
(d) 1 mark – The marks for identification and internalisation are not awarded as
there is no mention in either answer of promoting or adopting a healthy lifestyle /
healthy diet / exercise. However, as indicated in the additional guidance, one
mark is awarded for correctly giving the idea of ‘people they admire’ and
‘reasoned arguments’.
Question 8
The candidate was awarded 5 marks.
(a) 2 marks
(b) 1 mark
(c) 1 mark
(d) (i) 1 mark
(ii) 0 marks – candidate has not entered the units.
(iii) 0 marks
Question 9
The candidate was awarded 1 mark.
(a) 0 marks
(b) 0 marks
(c) 1 mark – The first sentence is wrong. Cocaine does not inhibit breakdown
proteins, it inhibits reuptake proteins. The ‘build-up of dopamine at the
receptor site’ implies dopamine remains at the receptors.
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Question 10
The candidate was awarded 1 mark.
(a) 0 marks
.
(b) 0 marks
(c) 1 mark
Question 11
The candidate was awarded 4 marks.
(a)(i) 2 marks
(ii) 1 mark
(b) 1 mark – Phagocytes engaging pathogens by phagocytosis implies engulfing
pathogens.
Question 12
The candidate was awarded 3 marks.
(a) 1 mark
(b) 0 marks
(c) 1 mark
(d) 1 mark
Question 13
The candidate was awarded 3 marks.
(a)(i) 1 mark
(ii) 1 mark
(iii) 0 marks
(b) 0 marks – wrong answer continues at back of paper.
(c) 1 mark
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Question 14
The candidate was awarded 10 marks.
(B)(i) 5 marks for mentioning points 1, 2, 3, 5, 6 and 7.
(ii) 5 marks for mentioning points a, b, c, e, and g.
Total mark
The evidence for this candidate has achieved an overall mark of 52 for the paper.
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Candidate 4
The evidence for this candidate has achieved the following marks for each question of this Course Assessment component.
Question 1
The candidate was awarded 3 marks.
(a) 1 mark
(b) 1 mark
(c) (i) 1 mark
(ii) 0 marks
Question 2
The candidate was awarded 6 marks.
(a) 1 mark
(b) (i) 1 mark – Specific description of a gene mutation given (deletion).
(ii) 1 mark
(c) 1 mark
(d) 2 marks
Question 3
The candidate was awarded 9 marks.
(a) 2 marks
(b) (i) 2 marks –The cross at 0, 60 should be ignored as it is clearly part of a line
that the candidate has attempted to remove. Note – The candidate has also
drawn a graph at the end of the paper. However, this should be ignored
as the candidate has indicated not to use it.
(ii) 1 mark – Candidate gets this mark for clarifying the answer by saying ‘able
to grow from the surviving cells decreases’.
(iii) 1 mark
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(c) (i) 1 mark
(ii) 1 mark
(iii) 1 mark
Question 4
The candidate was awarded 4 marks.
(a) 1 mark
(b) 1 mark
(c) 1 mark
(d) 0 marks – Candidate cannot be awarded this mark as answer must indicate
fructose-6-phosphate.
(e) 1 mark
Question 5
The candidate was awarded 6 marks.
(a)(i) 2 marks
(ii) 1 mark
(b) 1 mark
(c) 2 marks – Marks awarded for ‘rapid contractions’ and ‘contains creatine
phosphate’. No mark is awarded for ‘short duration of activity’ as there is no
mention of contractions.
Question 6
The candidate was awarded 5 marks.
(a)(i) 1 mark
(ii) 2 mark – ‘Cells are cultivated’ is the equivalent of cells being cultured.
(iii) 1 mark
(b) 1 mark
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Question 7
The candidate was awarded 4 marks.
(a) 1 mark
(b) 1 mark
(c) 1 mark – Assume m = mass and h = height.
(d) 1 mark – No mark is awarded for identification as there is no indication that
the lifestyle is a healthy lifestyle.
Question 8
The candidate was awarded 6 marks.
(a) 2 marks
(b) 1 mark
(c) 1 mark
(d) (i) 0 marks – although candidate has calculated 4·5 they have entered 5 in the
answer line.
(ii) 1 mark
(iii) 1 mark
Question 9
The candidate was awarded 3 marks.
(a) 1 mark
(b) 1 mark
(c) 1 mark – There is no mention of proteins so candidate cannot get the cocaine
mark. Both correct statements refer to dopamine so candidate can only be
awarded one mark.
.
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Question 10
The candidate was awarded 3 marks.
(a) 2 marks
(b) 0 marks
(c) 1 mark
Question 11
The candidate was awarded 5 marks.
(a)(i) 2 marks – ‘Vasodilation of capillaries’ is wrong but candidate gains this
mark for indicating ‘enhanced capillary permeability’.
(ii) 1 mark
(b) 2 marks
Question 12
The candidate was awarded 4 marks.
(a) 1 mark
(b) 1 mark
(c) 1 mark
(d) 1 mark
Question 13
The candidate was awarded 4 marks.
(a)(i) 1 mark
(ii) 1 mark
(iii) 0 marks
(b) 1 mark
(c) 1 mark