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9700/22

Biology 9700/22 — May/June 2011

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

6
questions
60
marks
75
minutes

Topics The Mitotic Cell Cycle · (outdated) Ecology · Transport in Mammals · Infectious Diseases · Cell Structure · Nucleic Acids and Protein Synthesis · +4 more

Q1The Mitotic Cell CycleFree sample

Fig. 1.1 is a photomicrograph of a root tip of onion, Allium cepa, showing cells in interphase and in stages of mitosis.

(a)

Name the stages of mitosis shown in cells A, B and C.

A ______

B ______

C ______

3M
(b)

Suggest why the cells labelled D are smaller than most of the other cells in Fig. 1.1.

1M
(c)

Interphase is often described as a ‘resting stage’.

Explain why the term ‘resting stage’ is not an appropriate description for cells in interphase.

2M

The rest of this paper

5 more questions
  • Q2(outdated) Ecology8M
  • Q3Transport in Mammals13M
  • Q4Infectious Diseases · Cell Structure · Nucleic Acids and Protein Synthesis13M
  • Q5Biological Molecules · Cell Membranes and Transport · Enzymes15M
  • Q6Gas Exchange5M
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