Edexcel GCE
In Biology B (9BI0)
Paper 01: Advanced Biochemistry,
Microbiology, and Genetics
Mark Scheme (Results)
Summer 2023
,General Marking Guidance
*
All candidates must receive the same treatment.
Examiners must mark the first candidate in exactly the
same way as they mark the last.
*
Mark schemes should be applied positively. Candidates
must be rewarded for what they have shown they can
do rather than penalised for omissions.
*
Examiners should mark according to the mark scheme
not according to their perception of where the grade
boundaries may lie.
*
There is no ceiling on achievement. All marks on the
mark scheme should be used appropriately.
*
All the marks on the mark scheme are designed to be
awarded. Examiners should always award full marks if
deserved, i.e. if the answer matches the mark scheme.
Examiners should also be prepared to award zero marks
if the candidate's response is not worthy of credit
according to the mark scheme.
*
Where some judgement is required, mark schemes will
provide the principles by which marks will be awarded
and exemplification may be limited.
*
When examiners are in doubt regarding the application
of the mark scheme to a candidate's response, the team
leader must be consulted.
*
Crossed out work should be marked UNLESS the
candidate has replaced it with an alternative response.
,Question
Number
Answer
Additional Guidance
Mark
1(a)(i)
*
(calcium) pectate (1)
IGNORE middle lamella
DO NOT ACCEPT any other molecule
(1)
Question
Number
Answer
Mark
1(a)(ii)
The only correct answer is C
A is incorrect because statements 1 and 2 are correct and statement 3 is incorrect
B is incorrect because statements 1 and 2 are correct and statement 3 is incorrect
D is incorrect because statements 1 and 2 are correct and statement 3 is incorrect
, (1)
Question
Number
Answer
Additional Guidance
Mark
1(b)
An explanation that makes reference to four of the following:
*
(decrease in concentration) due to K+ {leaving (cell) / being used in
synthesis of correct named molecule} AND (increase in concentration)
due to K+ being taken up (by cell) (1)
*
ions decrease {by (facilitated) diffusion / move down a concentration
gradient} (1)
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