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  • Biology Factsheet: 13. Genetic engineering

    Biology Factsheet: 13. Genetic engineering

    The sequence of nucleotide bases on a DNA molecule makes up the genetic code. Each triplet of three bases codes for a particular amino acid. Using this code, a cell can produce any one of the many pro...

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  • Biology Factsheet: 14. Bioaccumulation and biomagnification

    Biology Factsheet: 14. Bioaccumulation and biomagnification

    Biodegradable substances are those which can be broken down by microbes into harmless compounds.  Conservative pollutants are unable to be broken down and will build up in the soil or marine envi...

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  • Biology Factsheet: 15. The greenhouse effect

    Biology Factsheet: 15. The greenhouse effect

    Many people regard global warming or the greenhouse effect as the most serious environmental threat to our present way of life on earth....

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  • Biology Factsheet: 16. Flow of energy through ecosystems

    Biology Factsheet: 16. Flow of energy through ecosystems

    The sun is the ultimate source of energy on earth.  The process of nuclear fusion in the sun releases a huge amount of energy which reaches the earth in the form of electromagnetic radiation...

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  • Biology Factsheet: 17. The control of body temperature

    Biology Factsheet: 17. The control of body temperature

          There may be as many as 2000 different chemical reactions taking place inside a single living cell. Each of these is controlled by an enzyme and enzymes are very sensit...

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  • Biology Factsheet: 18. The nitrogen cycle

    Biology Factsheet: 18. The nitrogen cycle

      All living organisms need a source of nitrogen in order to synthesise molecules such as DNA and proteins. This Factsheet will summarise how plants and animals obtain that nitrogen. ...

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  • Biology Factsheet: 19. Plant tissues

    Biology Factsheet: 19. Plant tissues

    This Factsheet will summarise the structure and function of simple and complex plant tissues.  ...

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  • Biology Factsheet: 20. Nerves and synapses

    Biology Factsheet: 20. Nerves and synapses

      Nerve cells (neurones) are adapted for transmitting nerve impulses over long distances...

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  • Biology Factsheet: 21. Support in plants and animals

    Biology Factsheet: 21. Support in plants and animals

        Why is Support needed?  Animals and plants require support in order to maintain their shape.  Plants must support their above-ground structures so that they can:  ...

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  • Biology Factsheet: 22. Protein synthesis: I -nucleic acids

    Biology Factsheet: 22. Protein synthesis: I -nucleic acids

    Proteins are large, organic molecules which play a fundamental role in metabolic activities including nutrition, respiration, transport,  sensitivity, co-ordination and reproduction....

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