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    Does anyone happen to know if I need to remember the average sizes of the aformentioned cells for the EDEXCEL exam board.

    I checked the spec and found the following quote:

    'Be able to compare the structure of bacteria and viruses.'

    And similar quoting in reference to eukaryotic cells. Now in all the revision guides i've seen they mention the sizes of the cells too, but never have i seen it in a markscheme or exam question.

    So should i learn their sizes or not?

    Many thanks
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    (Original post by Yme2day)
    Does anyone happen to know if I need to remember the average sizes of the aformentioned cells for the EDEXCEL exam board.

    I checked the spec and found the following quote:

    'Be able to compare the structure of bacteria and viruses.'

    And similar quoting in reference to eukaryotic cells. Now in all the revision guides i've seen they mention the sizes of the cells too, but never have i seen it in a markscheme or exam question.

    So should i learn their sizes or not?

    Many thanks
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    Sizes of both prokaryotic organisms as well as of eukaryotic cells of different e.g. human tissues vary widely, so it is just worth remembering a few classical examples.

    A normal human erythrocyte is about 7u (7 micrometres) in diameter.

    A squid axon is nearly a millimetre in diameter and therefore is useful in researching neurons. A human pyramidal tract neuron (motor neuron that supplies muscles) can have an axon up to a metre long (extending from the brain to the first synapse).

    Even these figures are probs not in the syllabus, but there is no stipulation anywhere that suggests that it is illegal to learn more than the syllabus requires.

    M
 
 
 

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