Question 5
The table shows the pH ranges that support the growth of different bacteria.
Bacteria pH range
Salmonella 3.6–9.5
Listeria monocytogenes 4.2–9.6
Escherichia coli 4.3–9.0
What happens to these organisms at a pH of 3.7?
a
Salmonella, Listeria monocytogenes and Escherichia coli do not grow.
b
Listeria monocytogenes grows. Salmonella and Escherichia coli do not grow.
c
Salmonella grows. Listeria monocytogenes and Escherichia coli do not grow.
d
Escherichia coli grows. Listeria monocytogenes and Salmonella do not grow.