Biology 9700/22 — October/November 2013
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Transport in Mammals · Cell Structure · The Mitotic Cell Cycle · Biological Molecules · Enzymes · Transport in Plants · +4 more
Fig. 1.1 is a diagram of a transverse section through a vein.
Fig. 1.1
Calculate the actual diameter of the vein marked by the line X–Y.
Show your working and give your answer in millimetres (mm).
answer = ______
The presence of a valve would help to confirm that the blood vessel in Fig. 1.1 is a vein and not an artery.
Describe three structural features of the blood vessel shown in Fig. 1.1 that would help to identify it as a vein and not as an artery.
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Explain how the following structural features of a capillary are related to its function.
The capillary wall is composed of a single layer of squamous epithelial cells.
The diameter of the capillary lumen is approximately .
The inner lining of arteries and veins is composed of a layer of epithelial cells supported by a layer of elastic and connective tissue. The epithelial cells are capable of cell division by mitosis.
State the role of mitosis in cell division of epithelial cells.
Explain why the epithelial cells undergo mitosis and not meiosis.
Fig. 1.2 is a diagram of a cell in late prophase of mitosis.
Fig. 1.2
Complete Fig. 1.3 to show the same cell in the anaphase stage of mitosis.
Fig. 1.3
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