Biology 9700/21 — May/June 2021
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · Biological Molecules · Cell Membranes and Transport · Nucleic Acids and Protein Synthesis · Transport in Plants · Enzymes · +3 more
Fig. 1.1 is a transmission electron micrograph of cells from duckweed, Spirodela oligorrhiza.
Calculate the actual width of the cell labelled X.
Write down the formula you will use to make your calculation.
Show your working and give your answer in micrometres to one decimal place.
actual width = ______
Table 1.1 lists some biological molecules found in plant cells.
Complete Table 1.1 by choosing one letter from Fig. 1.1 that indicates a cell structure where each biological molecule is found.
Table 1.1
| biological molecule | letter from Fig. 1.1 |
|---|---|
| DNA | |
| cellulose | |
| phospholipid | |
| histone proteins |
State the name of a cell structure, visible in Fig. 1.1, where ATP is synthesised.
Name a cell structure that produces mRNA.
Describe the evidence from Fig. 1.1 that shows that the image is a transmission electron micrograph.
The rest of this paper
5 more questions- Q2Biological Molecules · Transport in Plants9M
- Q3Cell Membranes and Transport7M
- Q4Enzymes · Transport in Mammals11M
- Q5Infectious Diseases · Immunity13M
- Q6Cell Structure · Cell Membranes and Transport9M