is this correct

Question

A researcher wanted to test the effectiveness of a new antibiotic on Streptococcus pyrogenes, the species of bacteria that causes strep throat. Bacteria were added to dish 1, dish 2, and dish 3. A disk soaked in the new antibiotic was then placed in dish 2. Dish 3 was set up as the
control. The dishes are shown in the diagram below.


59 State one appropriate hypothesis for this experiment. [1]

One appropriate hypothesis for this experiment could be: The new antibiotic will inhibit the growth of Streptococcus pyrogenes in dish 2, resulting in a zone of inhibition around the antibiotic disk.

60 All three dishes were placed in an incubator at 37°C for 24 hours. The results for dish 1 are shown to the right.

Complete (color in) the diagram of dish 2 below to represent an example of experimental results that would support your hypothesis. (Use the “Draw” tab in Microsoft Word)

Explain how your diagram supports your hypothesis. [1]

*The clear zone (zone of inhibition) around the antibiotic disk in dish 2 indicates that the antibiotic is effective in killing or inhibiting the bacteria, thus supporting the hypothesis that the new antibiotic can inhibit the growth of Streptococcus pyrogenes.

61 Describe how the disk in dish 3 should be prepared so it can serve as the control for
this experiment. [1]
*The disk in dish 3 should be prepared by soaking it in a solution that does not contain the new antibiotic, such as sterile water or a different type of non-antibiotic substance (example, saline ). This will allow dish 3 to serve as a control to compare the effects of the antibiotic in dish 2 with the natural growth of bacteria in the absence of the antibiotic.

Answer 1

Your responses to the questions are well articulated and appropriate for the context of the experiment. Let's review each component:

59. Hypothesis: Your proposed hypothesis is clear and concise: "The new antibiotic will inhibit the growth of Streptococcus pyrogenes in dish 2, resulting in a zone of inhibition around the antibiotic disk." This hypothesis is relevant as it predicts the expected outcome when the antibiotic is tested against the bacteria.

60. Diagram Explanation: The explanation of how the diagram supports the hypothesis is also correct: The clear zone (zone of inhibition) around the antibiotic disk in dish 2 indicates that the antibiotic is effective in killing or inhibiting the bacteria, thus supporting the hypothesis that the new antibiotic can inhibit the growth of Streptococcus pyrogenes. This explanation correctly interprets the results you would expect if the hypothesis is supported.

61. Control Disk Preparation: Your response detailing how the disk in dish 3 should be prepared is accurate: The disk in dish 3 should be prepared by soaking it in a solution that does not contain the new antibiotic, such as sterile water or a different type of non-antibiotic substance (for example, saline). This will allow dish 3 to serve as a control to compare the effects of the antibiotic in dish 2 with the natural growth of bacteria in the absence of the antibiotic. This correctly identifies the purpose of the control and ensures a valid comparison.

Overall, your responses demonstrate a solid understanding of the experimental design and the concepts involved. Well done!