31. Which of the following bacteria is responsible for causing cholera?
a) Vibrio cholerae
b) Salmonella enterica
c) Listeria monocytogenes
d) Legionella pneumophila
32. Bacteria that derive energy from inorganic compounds are called:
a) autotrophs
b) heterotrophs
c) chemotrophs
d) phototrophs
33. Bacterial plasmids are:
a) small circular pieces of DNA
b) found only in gram-positive bacteria
c) involved in bacterial respiration
d) responsible for cell division
34. Which of the following diseases is caused by the bacterium Yersinia pestis?
a) malaria
b) plague
c) typhoid fever
d) diphtheria
35. Bacteria are involved in which of the following ecological processes?
a) decomposition
b) nitrogen fixation
c) carbon cycling
d) all of the above
