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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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  • Biology Factsheet: 49. Protein synthesis II - mechanisms

    Biology Factsheet: 49. Protein synthesis II - mechanisms

        This Factsheet summarises the key aspects of the mechanisms of protein synthesis.  1. The nature of the genetic code. 2. The relationships of transfer RNA (tRNA) to amino ac...

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  • Biology Factsheet: 50. Sources of genetic variation

    Biology Factsheet: 50. Sources of genetic variation

      Prerequisite knowledge: Before studying this Factsheet the student should know about the nature of DNA, RNA, chromosomes, and genes. Details of these can be found in Factsheet Number...

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  • Biology Factsheet: 51. Gene therapy

    Biology Factsheet: 51. Gene therapy

      This Factsheet will describe in simple terms the process of gene therapy and review some of the most serious conditions which may be treated by this method in future.  Gene therapy c...

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  • Biology Factsheet: 52. Data interpretation questions: temperature regulation

    Biology Factsheet: 52. Data interpretation questions: temperature regulation

      Temperature regulation is one form of homeostasis. Birds and animals are endothermic, that is, they are able to maintain a high body temperature by internal heat production. In contr...

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