Question

Bacterium "X" was grown in L-broth with shaking at 35°C to determine the growth rate (k) of that organism at that temperature. The growth rates of that bacterium grown at other temperatures were also determined, and all of the data was plotted in the graph shown below. Growth Rate (k) 15 20 25 30 35 40 45 50 Temperature (°C) The next graph shows just the exponential phase of growth of Bacterium "X" grown at 35°C, 40°C and 45°C. Note: the exponential growth indicated by the lines A, B and C, do not necessarily correspond to growth at 35°C, 40°C and 45°C, respectively. logo cells TTTTT Time B C Which line (A, B or C) represents growth of Bacterium "X" grown at 45°C? (1 point) W hich line (A, B or C) represents growth of Bacterium "X" grown at 40°C? (1 point) A Which line (A, B or C) represents growth of Bacterium "X" grown at 35°C? (1 point) Submit Answer Answer Submitted: Your final submission will be graded after the due date. Tries 3/99 Previous Tries

Answer 1

1. Line A represents the growth of Bacterium X at 45⁰ C. As the temperature is high, the growth of the bacteria is fastest at 45⁰ C and reaches the death phase faster.

2. Line B represents the growth of Bacterium X at 40⁰ C. As the temperature is lower than 45⁰ C but higher than 35⁰ C, the growth rate will be below 45⁰ C but higher than 35⁰ C.

3 Line C represents the growth of Bacterium X at 35⁰ C. As the temperature is low the growth of the bacteria will be slow and reach the stationary phase late.