Biology 9700 · AS & A Level · Transport mechanisms

Transport mechanisms — practice question

There are two kinds of cell: prokaryotic and eukaryotic. Bacterial cells are prokaryotic, whereas plant cells are eukaryotic.
(a)[3]

Finish Table 1.1 by stating one difference between a bacterial cell and a plant cell for each structural feature shown. The comparison for the cell surface membranes of the two cell types has already been done for you.

(b)[3]

One function of the cell surface membrane of bacterial cells and plant cells is moving substances into and out of cells. Explain how membrane carrier proteins and membrane channel proteins are involved in the movement of substances into and out of cells.

(c)[1]

Fig. 1.1 is a photomicrograph of chloroplasts in plant leaf cells. Explain why the chloroplasts are visible only around the periphery (edge) of each plant cell.

(d)[2]

Fig. 1.2 shows plant cells in a root tip where mitosis is occurring. Identify two cells in Fig. 1.2 that are at different stages of mitosis. Draw a label line to each cell and write the name of the mitosis stage shown by that cell.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: Cell surface membrane: present in both bacterial and plant cells; bacterial membranes contain hopanoids; plant membranes contain cholesterol.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI