(a(i))[1]
The structures labelled A and B in Fig. 1.1 are cross-sections of two mitochondria. Suggest why A and B have different shapes.
(a(ii))[2]
The structure labelled D in Fig. 1.1 is a mitochondrion that is about to divide. Explain why division of mitochondria is important for the cell shown in Fig. 1.1 and for cells in the root tips of thale cress.
(b)[2]
Within a cell, substances move between the nucleus and the cytoplasm. The area labelled C in Fig. 1.1 shows where this exchange takes place. Make a large, labelled drawing of area C to show the site of this exchange.
(c)[4]
Outline the roles of the nucleus in non-dividing cells, such as the cell in Fig. 1.1.