Fig. 5.1 is a photomicrograph showing a structure present in both animal cells and plant cells. The structure marked A is shown.
(a)[2]
State the name of the cell structure labelled A in Fig. 5.1, and give its function.
(b)[1]
State the two items of information required to work out the actual length of cell structure A in Fig. 5.1.
(c)[1]
Change this value into micrometres ($\mu$m).
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