(a(i))[1]
Give the names of the organelles described.
(a(ii))[1]
Suggest one reason why the organelles described do not always appear to have the same shape.
(b(i))[1]
Give the name of the cell structures described.
(b(ii))[1]
Choose the measurement that has the same value as $25\,\text{nm}$. The options are $0.00025\,\mu\text{m}$, $0.0025\,\mu\text{m}$, $0.025\,\mu\text{m}$, $0.25\,\mu\text{m}$, $2.5\,\mu\text{m}$.
(c(i))[1]
Give the name of the cell structures described.
(c(ii))[1]
Explain one advantage to the plant cell of having these structures.
(d)[1]
Fig. 1.1 shows a transmission electron micrograph of part of an epithelial cell from the small intestine of a mammal. Name the cell structures labelled $X$ in Fig. 1.1 and state their function.