A level Biology 1.2 Cells as the basic units of living organisms – Exam style question – Paper 2

Fig. 1.1 is a diagram showing part of a cell surface membrane of an animal cell.

(a) (i) State the approximate thickness of the membrane as shown by the line G–H.

(ii) Complete Table 1.1 to show:

• the names and functions of the components of the cell surface membrane
• the letters of the labels in Fig. 1.1 that identify each component.

(b) Fig. 1.2 is a drawing of a transmission electron micrograph (TEM) of a cell from the palisade mesophyll of a leaf.
The drawing does not show all of the organelles visible in a transmission electron micrograph.

(i) Complete Fig. 1.2 by drawing and labelling:

• a mitochondrion
• rough endoplasmic reticulum
• smooth endoplasmic reticulum.

Your drawings should show the detail that can be seen in a transmission electron micrograph.

(ii) Identify the organelle labelled X and state one function of this organelle.