A laboratory is testing a medicine designed to slow the division of cancer cells. Fig. 1 shows two microscope fields from the same type of cultured cell aft...
Question 1 Report
A laboratory is testing a medicine designed to slow the division of cancer cells. Fig. 1 shows two microscope fields from the same type of cultured cell after 24 hours. Dish A received no medicine. Dish B received the medicine. Cells with visible condensed chromosomes are counted as dividing cells. Both dishes had the same starting number of cells, volume of nutrient solution, temperature and oxygen supply.
(a) Use Fig. 1 to identify which dish has more cells in mitosis. [1]
(b) Calculate the difference in the number of dividing cells between the two dishes, using Fig. 1. [1]
(c) Explain why the scientist kept temperature the same for both dishes. [2]
Answer Details
(a) Dish A [1] (b) Correct subtraction of the numbers shown in Fig. 1 [1] (c) Temperature could affect the rate of cell division [1]; keeping it constant makes this a fair test so any difference is due to the medicine [1]
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