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Key tips

Look at the essay titles at the start of the examination try to make a decision which one interests you. This means it is not a shock when you get there, but
most importantly, you can begin to think about it as you move through the paper, the…

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General Principles for marking the Essay:

Scientific Content (maximum 16 marks)
Category Mark Descriptor
16
Most of the material reflects a comprehensive
understanding of the principles involved and a knowledge
of factual detail fully in keeping with a programme of Alevel
Good 14 study. Some material, however, may be a…

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r
k
3 A balanced account making reference to most areas that might realistically be covered on
an Alevel course of study.
2 A number of aspects covered but a lack of balance. Some topics essential to an
understanding at this level not covered.
1 Unbalanced account with all or…

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style and terminology to express ideas.
0 Material entirely irrelevant or too limited in quantity to judge.

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1.Gene technology and its applications


Expect descriptions and discussion within all or most of the following areas.

Manipulation of DNA, the isolation of the required lengths of DNA
The role of restriction endonucleases to cut out desired gene, at palindromic sequences
Production and role of `sticky ends'
Use of mRNA…

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base pairs. These are inheritable and unique to an individual as it depends which combinations they inherit. Process described briefly, extraction,
digestion, separation (gel electrophoresis and then in alkali), hybridisation with probe.


Examples of pharmaceutical products from microorganisms e.g., human insulin
Use of genetically modified plants e.g., increased shelf life…

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