Question

Use this graph to answer the questions below. The graph shows a bacterial culture in log phase (a flask of broth inoculated with bacteria growing at ideal temperature). An antimicrobial compound was added at time X. Number of cells (log scale) X Time Substance A Substance B 1. Identify whether each substance is bacteriostatic or bactericidal and explain how you know. (4 points) 2. Why does the number of cells not immediately drop to zero at time X? Identify three factors that affect bacterial death rate. (5 points) 3. Predict the appearance of the graph if Substance C was added to the culture at time X, but had no effect on the bacteria. Explain your prediction. (3 points)

          Use this graph to answer the questions below. The graph shows a bacterial culture in log phase (a flask of broth inoculated with bacteria growing at ideal temperature). An antimicrobial compound was added at time X.
Number of cells
(log scale)
X
Time
Substance A
Substance B
1. Identify whether each substance is bacteriostatic or bactericidal and explain how you know. (4 points)
2. Why does the number of cells not immediately drop to zero at time X? Identify three factors that affect bacterial death rate. (5 points)
3. Predict the appearance of the graph if Substance C was added to the culture at time X, but had no effect on the bacteria. Explain your prediction. (3 points)

Use this graph to answer the questions below. The graph shows a bacterial culture in log phase (a flask of broth inoculated with bacteria growing at ideal temperature). An antimicrobial compound was added at time X.
Number of cells
(log scale)
X
Time
Substance A
Substance B
1. Identify whether each substance is bacteriostatic or bactericidal and explain how you know. (4 points)
2. Why does the number of cells not immediately drop to zero at time X? Identify three factors that affect bacterial death rate. (5 points)
3. Predict the appearance of the graph if Substance C was added to the culture at time X, but had no effect on the bacteria. Explain your prediction. (3 points)

Added by Courtney H.

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