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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...

    Price £3.00more info
  • 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...

    Price £3.00more info
  • 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...

    Price £3.00more info
  • 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...

    Price £3.00more info
  • 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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  • Biology Factsheet: 53. Parasites

    Biology Factsheet: 53. Parasites

      Parasitism is probably the commonest mode of existence on Earth, since nearly all organisms in nature have associated parasites. In most cases the association of parasite and host is well...

    Price £3.00more info
  • Biology Factsheet: 54. Water potential

    Biology Factsheet: 54. Water potential

      Water potential strikes fear into many students.  However, in reality there are only five typical questions:  1. Here are two cells with different water potentials.  Which w...

    Price £3.00more info
  • Biology Factsheet: 55. Effect of light on living organisms

    Biology Factsheet: 55. Effect of light on living organisms

    The effect of light on living organisms is a good example of a synoptic  topic, i.e. one which requires students to pull together information from  many different areas of the syllabus. &n...

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  • Biology Factsheet: 56. Autonomic nervous system

    Biology Factsheet: 56. Autonomic nervous system

    Prerequisite knowledge: Before studying this Factsheet the student should know about sensory, relay and motor neurones and their  structure, about myelinated and non myelinated fibres, and about...

    Price £3.00more info
  • Biology Factsheet: 57. Oestrous cycles

    Biology Factsheet: 57. Oestrous cycles

    Mature female mammals characteristically have oestrous cycles during which they become fertile, can conceive and become pregnant.  Though humans have oestrous (menstrual) cycles which follow one...

    Price £3.00more info
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