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  • Biology Factsheet: 129. ATP  What it is, what it does

    Biology Factsheet: 129. ATP What it is, what it does

    ATP is a nucleotide composed of adenine ( a nitrogenous base), ribose (the  5-carbon or pentose sugar found in RNA) and three phosphate groups. ...

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  • Biology Factsheet: 130. Investigating Catalase

    Biology Factsheet: 130. Investigating Catalase

    This Factsheet  • Outlines the importance of catalase;  • Describes how catalase can be used to investigate the general properties  of enzymes;  • Analyses commo...

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  • Biology Factsheet: 131. Niches

    Biology Factsheet: 131. Niches

    Students often lose easy marks in ecology because definitions aren’t learned  properly. Perhaps this is because terms such as habitat and community are  in everyday use and students ...

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  • Biology Factsheet: 132. Phloem

    Biology Factsheet: 132. Phloem

    This Factsheet describes the structure and function of phloem and  concentrates on typical exam questions such as:  1. Labelling xylem and phloem in ts root sections  2. Describing t...

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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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