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INTRODUCTION
The marking schemes which follow were those used by WJEC for the January 2009
examination in GCE BIOLOGY/HUMAN BIOLOGY. They were finalised after detailed
discussion at examiners' conferences by all the examiners involved in the assessment. The
conferences were held shortly after the papers were taken so that reference could be made
to the full range of candidates' responses, with photocopied scripts forming the basis of
discussion.…read more

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AS MODULE BY1
Question Answers/Explanatory Notes Marks
Available
1. (a) F / calcium or G / phosphate
(b) I / sucrose
(c) A / magnesium
(d) D / cellulose
(e) G / phosphate
(f) H / water
(mark first answer) [1 mark each] [Total 6 marks]
2.…read more

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Question Answers/Explanatory Notes Marks
Available
3. (d) long chains cross linked by hydrogen bonds;
adjacent glucose molecules are rotated by 180º;
hydrogen bonds form between hydroxyl groups of adjacent parallel chains;
microfibrils. [2]
(not: fibres/fibrils) [Any 2]
[Total 6 marks]
4.…read more

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Question Answers/Explanatory Notes Marks
Available
5. (c) (i) P = diffusion Q = facilitated diffusion (must have both) [1]
(ii) facilitated diffusion causes more rapid movement of
molecules through a membrane than simple diffusion;
it relies on protein carriers / channel proteins;
and the rate is limited by the number of proteins in the membrane
i.e.…read more

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Question Answers/Explanatory Notes Marks
Available
6. (a) (i) A competitive [1]
B non competitive [1]
(ii) A [1]
(b) (i) 5°C kinetic energy is low / few collisions between the (active site)
of the enzyme and the substrate; [1]
Allow: ref. to increasing temp and kinetic energy i.e. assume 0 to 5o
70°C the hydrogen bonds are broken (as vibrations are strong) /
active site of the enzyme is denatured/ fewer ES complexes formed due
to denaturation. [1]
(ii) A.…read more

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Question Answers/Explanatory Notes Marks
Available
7.…read more

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Question Answers/Explanatory Notes Marks
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8.…read more

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Question Answers/Explanatory Notes Marks
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8.…read more

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WJEC
245 Western Avenue
Cardiff CF5 2YX
Tel No 029 2026 5000
Fax 029 2057 5994
E-mail: [email protected]
website: www.wjec.co.uk/exams.…read more

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