Biology 9700/21 — May/June 2011
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · Gas Exchange · The Mitotic Cell Cycle · Transport in Mammals · Nucleic Acids and Protein Synthesis · Enzymes · +2 more
Fig. 1.1 is an electron micrograph of cells from the ciliated epithelium of the trachea.
Calculate the magnification of the electron micrograph in Fig. 1.1.
Show your working and express your answer to the nearest whole number.
magnification = ______
Explain how the cells labelled A and the structures labelled B in Fig. 1.1 protect the lining of the trachea.
Cells, such as C, at the base of the epithelium of the trachea divide by mitosis.
Describe the changes that occur within the cell between the beginning of prophase and the end of metaphase.
The rest of this paper
5 more questions- Q2Transport in Mammals16M
- Q3Nucleic Acids and Protein Synthesis11M
- Q4Enzymes8M
- Q5Biological Molecules7M
- Q6Immunity7M