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  • Biology Factsheet: 133. Comparing Chemical Communication in Plants and Animals

    Biology Factsheet: 133. Comparing Chemical Communication in Plants and Animals

    Animals have two control systems for regulating body functions and behaviour. These are the nervous system and the endocrine system. The  endocrine system uses chemical communication and operate...

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  •  Biology Factsheet: 134. Cystic Fibrosis

    Biology Factsheet: 134. Cystic Fibrosis

      Cystic fibrosis(CF) is a common genetic disorder that occurs worldwide. It is the commonest inherited disease among white North Americans and Northern Europeans ...

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  • Biology Factsheet: 135. Transport Across the Placenta

    Biology Factsheet: 135. Transport Across the Placenta

    The placenta is the life support system of the mammalian fetus within the  uterus, prior to birth. It enables the blood capillary systems (and some  surrounding tissues) of the mother and ...

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  • Biology Factsheet: 136. Practical Investigations for Photosynthesis

    Biology Factsheet: 136. Practical Investigations for Photosynthesis

    Photosynthesis is a favourite topic for:  1. Coursework and in-class practicals  2. Exam questions – in the exam, photosynthesis investigations can be  used to test your unders...

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  • Biology Factsheet: 137. GM Farm Scale Evaluation Trials

    Biology Factsheet: 137. GM Farm Scale Evaluation Trials

    In October 2003 the government announced the long-awaited results of its  controversial farm scale investigations into whether GM crops were  harmless or harmful for the environment. These...

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  • Biology Factsheet: 138. Biological Oxygen Demand

    Biology Factsheet: 138. Biological Oxygen Demand

    What is it?  It is the amount of oxygen used by organisms in a body of water over a  specified time period. By definition, aerobic organisms use oxygen in  respiration. The more orga...

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  • Biology Factsheet: 139. Answering Exam Questions on the Heart

    Biology Factsheet: 139. Answering Exam Questions on the Heart

    When answering most exam questions on the heart it is essential that you know the basic anatomy of the heart, the cardiac cycle and how  the heart beat is controlled. You will be able to interpr...

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  • Biology Factsheet: 140. Absorption in the Small Intestine

    Biology Factsheet: 140. Absorption in the Small Intestine

    This topic appears regularly in exams of all the Boards. This is not because  it is particularly difficult – in fact it’s pretty straightforward -  but because:  1. it can...

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  • Biology Factsheet: 141. Forests and Energy Cycles

    Biology Factsheet: 141. Forests and Energy Cycles

    Examiners commonly set questions which test students ability to apply  their knowledge of the C and N cycle to forest ecosystems. Examiners like  these questions because students often:&nb...

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  • Biology Factsheet: 142. Modern Examples of Evolution in Action

    Biology Factsheet: 142. Modern Examples of Evolution in Action

    Natural selection was proposed by Darwin and by Wallace as being the mechanism by which new species arise from pre-existing species. ...

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