This document contains the solutions to 4 multiple choice questions about bacteria: 1) Question 16 asks about the bacterium decolorized in Gram's experiment. The answer is Escherichia coli as it is Gram-negative and has a thin cell wall that does not retain dye. 2) Question 17 is about a non-toxigenic microbe. The answer is that it is normal flora and non-pathogenic. 3) Question 18 asks about how bacteria acquire genes for exotoxin production. The answer is through bacteriophages, which are extra pieces of DNA in bacterial cells. 4) Question 19 is about a coenocyte, which is a eukaryotic