Question

1. based on the results shown in figure 2, which of the following statements is true?

○ all three bacteria groups had the same fraction of survivors after 10 hours of exposure to antibiotics.
○ the persistent bacteria group had the highest fraction of survivors after 10 hours of exposure to antibiotics.
○ the susceptible bacteria group had the highest fraction of survivors after 10 hours of exposure to antibiotics.
○ the tolerant bacteria group had the highest fraction of survivors after 10 hours of exposure to antibiotics.

Explanation:

To determine the true statement, we analyze the options based on typical knowledge of bacterial responses to antibiotics (Natural Science - Biology subfield). Persistent bacteria are adapted to survive antibiotics, so they likely have the highest survival fraction. The first option is false (groups differ), susceptible bacteria are killed easily (third false), tolerant may survive but persistent are more adapted to long - term exposure. So the persistent bacteria group having the highest fraction of survivors is the true statement.

Answer:

B. The persistent bacteria group had the highest fraction of survivors after 10 hours of exposure to antibiotics.