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  • Biology Factsheet: 28. Feedback control mechanisms

    Biology Factsheet: 28. Feedback control mechanisms

        This Factsheet summarises the processes of negative and positive feedback control mechanisms and illustrates how such mechanisms help to regulate blood concentration, blood glucos...

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  • Biology Factsheet: 29. Plant and animal adaptations to dry environments

    Biology Factsheet: 29. Plant and animal adaptations to dry environments

      Xerophytes are plants which are adapted to live in dry conditions. Xeromorphic features are those which minimise water loss from the plant.  The vast majority of the water which plants ab...

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  • Biology Factsheet: 30. The biological importance of water

    Biology Factsheet: 30. The biological importance of water

    Water (H2O) is the most abundant molecule in cells, whole organisms and on earth. This is a consequence of the unique physical and chemical properties of water. This Factsheet will briefly exp...

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  • Biology Factsheet: 31. Enzyme control of metabolic pathways

    Biology Factsheet: 31. Enzyme control of metabolic pathways

    It is essential that the various biochemical processes occurring within an organism are adaptable. This means that the rates of biochemical reactions need to vary in response to change. In hum...

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  • Biology Factsheet: 32. Viruses made simple

    Biology Factsheet: 32. Viruses made simple

    Viruses lack the mitochondria necessary to derive energy and they cannot reproduce on their own.  They are dependent on their host cells and are only classed as living organisms when they...

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  • Biology Factsheet: 33. Fermentation made simple

    Biology Factsheet: 33. Fermentation made simple

      Fermentation involves the culture of cells in aerobic and anaerobic conditions. Industrial fermentation usually uses the large-scale culture of micro-organisms to produce useful products....

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  • Biology Factsheet: 34. Species diversity

    Biology Factsheet: 34. Species diversity

    Species diversity is a very important ecological idea. It can be expressed mathematically and describes the number of individuals and the number of species in a community. It is estimated that...

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  • Biology Factsheet: 35. Structure and function of the mammalian heart

    Biology Factsheet: 35. Structure and function of the mammalian heart

      This Factsheet summarises:  l. The structure of the heart and the histology of cardiac muscle.  2. The cardiac cycle and its regulation by the heart itself.  3. The modificat...

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  • Biology Factsheet: 36. Structure and function of blood and lymph

    Biology Factsheet: 36. Structure and function of blood and lymph

      This Factsheet summarises: 1. The structure and function of blood plasma, red blood cells  and white blood cells.  2. The formation of lymph and tissue fluid from blood plasma.&nb...

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  • Biology Factsheet: 37. Ischaemic (Coronary) Heart disease

    Biology Factsheet: 37. Ischaemic (Coronary) Heart disease

      Ischaemia is the term used to describe the condition when there is a mismatch between the amount of oxygen which a cell needs and the amount which it receives.  Insufficient oxygen s...

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