Multiple choice Which of the following is a set of neutrophiles only? Alicyclobacillus, Ferroplasma and Sulfolobus Escherichia, Euglena and Paramecium Sulfolobus, Escherichia and Euglena Euglena, Natronobacterium and Paramecium Alicyclobacillus, Escherichia and Paramecium Reveal answer Fill a bubble to check yourself B Correct answer Explanation Escherichia, Euglena and Paramecium: All are neutrophiles (optimum growth between pH 5.5 and 8.0).