Question

A student placed a disk of filter paper in each of the following solutions: disinfectant 1, disinfectant 2, disinfectant 3, and distilled water. While the four disks were soaking in their respective solutions, she streaked a sterile nutrient agar dish with a culture of E. coli bacteria. Then she placed each disk carefully onto the nutrient agar dish, placed the lid on the dish, taped it shut, and incubated the dish at 37°C for several days. Figure 20-5 shows how the nutrient agar dish looked on Day 1 and Day 4. 1.) Design an Experiment Based of figure 20-5, what is the student probably trying to test?
2.) Control Variables, What is the control in the experiment shown in figure 20-5?
3.) Draw conclusions,Based on Figure 20-5, how can the student measure the effectiveness of each disinfectant?
4.) Infer, Look at the dishes in figure 20-5. Which disinfectant was the most effective at controlling the growth of E. coli? how do you know?
5.) DRAW CONCLUSIONS, Look at the results of the experiment shown in figure 20-5. why do you think the different disinfectants are not equally effective against the E. coli bacteria?

Answer 1

Hey junky

Answer 2

hey can you help on this?

Answer 3

Yup

Answer 4

A student placed a disk of filter paper in each of the following
solutions: disinfectant 1, disinfectant 2, disinfectant 3, and distilled
water. While the four disks were soaking in their respective solutions,
she streaked a sterile nutrient agar dish with a culture of E. coli bacteria. Then, she placed each disk carefully onto the nutrient agar dish,
placed the lid on the dish, taped it shut, and incubated the dish at 37ºC
for several days. Figure 19-4 shows how the nutrient agar dish looked
on Day 1 and Day 4.

Answer 5

Way too much, ill pass... Thanks mr.forest grump,

Answer 6

i dont understand it... thanks anyways

Answer 7

Ask your teacher