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  • Biology Factsheet: 09. Oxygen dissociation curves

    Biology Factsheet: 09. Oxygen dissociation curves

    This Factsheet summarises: 1. The mechanisms of oxygen and carbon dioxide transport in blood 2. The interactions between the mechanisms of oxygen and carbon dioxide transport  and blood pH contro...

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  • Biology Factsheet: 10. Biology of freshwater pollution

    Biology Factsheet: 10. Biology of freshwater pollution

    Pollution can be defined as “The introduction by Man into the environment of substances or energy harmful to plant or animal life, or which damage amenity or structure”. This Factsheet con...

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  • Biology Factsheet: 11. Ecological succession

    Biology Factsheet: 11. Ecological succession

    Succession can be defined as the change in the structure and species composition of a community over time. It is very often confused with zonation - the change in species composition over an area....

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  • Biology Factsheet: 12. Respiration

    Biology Factsheet: 12. Respiration

    Cellular respiration is the process by which the energy contained in organic molecules  is made available for all of the active processes within a cell.  The usual substrate (the organic sub...

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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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