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  • Biology Factsheet: 154. Zonation and Succession

    Biology Factsheet: 154. Zonation and Succession

    Students commonly confuse the terms zonation and succession. This may be because both processes involve a change in species.  However, they are very different processes. This Factsheet explains ...

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  • Biology Factsheet: 155. Answering Exam Questions on Neurones and Synapses

    Biology Factsheet: 155. Answering Exam Questions on Neurones and Synapses

    You must know the structure (histology) of a neurone, the functions of its component parts and be able to distinguish between different types of neurone.   ...

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  • Biology Factsheet: 156. Dominant and Recessive Alleles

    Biology Factsheet: 156. Dominant and Recessive Alleles

    Remember the following fact about genes.  • A  gene is a unit of inheritance which codes for the development of a particular characteristic in an organism. ...

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  • Biology Factsheet: 157. Diabetes - Management or Cure?

    Biology Factsheet: 157. Diabetes - Management or Cure?

    This Factsheet:  • Summarises how glucose concentration are maintained within  narrow limits in the body.  • Outlines the causes of diabetes.  • Summarises how d...

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  • Biology Factsheet: 158. Answering Questions: Growth of Organisms

    Biology Factsheet: 158. Answering Questions: Growth of Organisms

    Even if microbiology is not on your specification, you may still face a question about the growth of bacteria/yeast/algae etc in the exam!  Why? Because the examiners aren’t really testing...

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  • Biology Factsheet: 159. The Structure and Function of Polysaccharides

    Biology Factsheet: 159. The Structure and Function of Polysaccharides

    This Factsheet summarises:  • The structure of the polysaccharides starch, glycogen and  cellulose.  • The functions of polysaccharides.  • How structure is rela...

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  • Biology Factsheet: 160. Countercurrent Flow in Biology

    Biology Factsheet: 160. Countercurrent Flow in Biology

    Countercurrent flow is a mechanism which maintains diffusion  gradients across membranes. In turn, this means that transport or  exchange of substances across the membrane can be fast and&...

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  • Biology Factsheet: 161. Negative Feedback Mechanisms

    Biology Factsheet: 161. Negative Feedback Mechanisms

    This Factsheet summarises the most important examples of negative  feedback in living organisms....

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  • Biology Factsheet: 162. The Biology of HIV

    Biology Factsheet: 162. The Biology of HIV

    HIV is on all A level specifications. Exam questions are common  and relatively straightforward. You simply need to learn a few facts  and then practice applying this knowledge to the type...

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  • Biology Factsheet: 163. Answering Questions: enzyme activity

    Biology Factsheet: 163. Answering Questions: enzyme activity

    This Factsheet summarises the most common questions about enzyme activity that have appeared over the 5 years on all the Boards. ...

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