(a)[3]
Use letter P or letter Q from Fig. 6.1 to complete Table 6.1 and indicate the location of the structures and the place where the compounds are used.
(b(i))[1]
Calculate the mean number of mitochondria per $\mu\text{m}^3$ for the liver cell. Record your answer in Table 6.2.
(b(ii))[2]
Suggest reasons for the difference in mean number of mitochondria per $\mu\text{m}^3$ between the fat cell and the heart cell.
(b(iii))[1]
Suggest why it is hard to compare the ability of the three types of cell to respire aerobically using only the mean number of mitochondria per cell.