Question

Scientists investigated the effect of bromelain on cancer cells. They took cells from skin cancers in mice and added them to a liquid growth medium in two dishes. Four hours later they added a solution of bromelain to one of the dishes. They left the other dish as a control. They also added a substance to both dishes that is turned purple by respiring cells. Both dishes were placed in an incubator. The scientists measured the intensity of the purple color at intervals over a period of 100 hours.

(a) The scientists put the same number of skin tumor cells in each dish at the start of this investigation. Explain why it was important to put the same number of cells in each dish.
a) To maintain consistency in the experiment
b) To observe the effects of bromelain accurately
c) To control the humidity in the incubator
d) To study cell respiration

Answer 1

The same number of cells were put in each dish in order to maintain consistency in the experiment and accurately observe the effects of bromelain.

Step-by-step explanation:

In this experiment, it was important to put the same number of skin tumor cells in each dish to maintain consistency in the experiment and to observe the effects of bromelain accurately. By starting with the same number of cells in both dishes, any difference in the intensity of the purple color can be attributed to the presence of bromelain rather than differences in the initial cell count. This ensures that the results are reliable and that any effect of bromelain can be properly evaluated.