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  • Biology Factsheet: 39. Carbohydrates: revision summary

    Biology Factsheet: 39. Carbohydrates: revision summary

    Carbohydrates contain 3 elements: Carbon (C), Hydrogen (H) and Oxygen (O). Thus, if we remove water from carbohydrates, all that remains is carbon. Carbohydrates can be divided into 3 categories; mon...

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  • Biology Factsheet: 40. Disease and defence

    Biology Factsheet: 40. Disease and defence

    This Factsheet summarises:  l. The immunological response in humans and the structure of antigens and antibodies. 2. T-lymphocytes and cell mediated immunity. 3. B-lymphocytes and humo...

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  • Biology Factsheet: 41. The role of the liver in homoeostasis

    Biology Factsheet: 41. The role of the liver in homoeostasis

    The liver helps to regulate the composition of the blood and is, therefore, a major homeostatic organ....

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  • Biology Factsheet: 42. The structure and function of lipids

    Biology Factsheet: 42. The structure and function of lipids

      This Factsheet summarises the structure and function of lipids. Lipids are organic compounds found in every type of plant and animal cell. They always contain the elements carbon, hydroge...

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  • Biology Factsheet: 43. Factors affecting enzyme activity

    Biology Factsheet: 43. Factors affecting enzyme activity

      Enzymes are globular proteins which act as biological catalysts. This means that they speed up the rate of reaction by lowering the activation energy, that is the energy required to break bond...

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  • Biology Factsheet: 44. Evolution

    Biology Factsheet: 44. Evolution

    In order to understand evolution you have to understand 4 key principles:  1. Variation - what it is and how it is produced 2. Excess offspring means competition 3. The effects of...

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  • Biology Factsheet: 45. Gene expression

    Biology Factsheet: 45. Gene expression

      It is through gene expression that the phenotypes of organisms are assembled.  This Factsheet will summarise the nature of gene expression and will explain some of the mechanisms by ...

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  • Biology Factsheet: 46. Muscles

    Biology Factsheet: 46. Muscles

    This Factsheet summarises;    1. The distribution and functions of striated, smooth and cardiac muscle 2. The anatomy and histology of striated muscle including electron...

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  • Biology Factsheet: 47. The economic importance of enzymes

    Biology Factsheet: 47. The economic importance of enzymes

      Enzymes are important in commercial processes because they accelerate specific chemical reactions to produce a useful product or effect.  Enzymes are sometimes used when still r...

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  • Biology Factsheet: 48. Tackling exam questions: plant growth substances

    Biology Factsheet: 48. Tackling exam questions: plant growth substances

      The amount of information which students need on this topic varies significantly between different A Level syllabuses. This Factsheet summarises:  1. Those aspects which are co...

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