A-LevelBiologyCell structure9700/23 · Oct/Nov 2017 · Q17 Marks
Fig. 1.1 is a transmission electron micrograph of a part of an animal cell. [Figure 1.1]
- (a)Calculate the actual width of the organelle labelled A, as shown by line X-Y. State the formula that you will use and show your working. Give your answer in μm and to one decimal place.[3]
- (b)(i)Name the organelle A and state its role in cells. name role[2]
- (b)(ii)Name the cell structure labelled B and state one reason for your answer. name reason[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [1] actual length = image length/magnification ; A A = I/M M = I/A I = A × M or magnification triangle
- [2] 2.5 (μm) ;; for 40 mm X–Y length (A 2.6 (for 40/41 mm) A 2.4 (for 38/39mm))
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