Exam #1 Practice Questions

Modern species definitions required each species to be a monophyletic group. What does this imply?
(a) The group includes all organisms derived from a common ancestor
(b) The group must be in the pure culture and able to cause disease when introduced to a healthy host
(c) The group includes only organisms with genomes that re associate >70%
(d) The group includes organisms with a single name
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Modern species definitions required each species to be a monophyletic group. What does this imply?
(a) The group includes all organisms derived from a common ancestor
(b) The group must be in the pure culture and able to cause disease when introduced to a healthy host
(c) The group includes only organisms with genomes that re associate >70%
(d) The group includes organisms with a single name
Which of the following is one of Koch's postulates that was only useful because of one of Pasteur's previous discoveries?
(a) The suspect microbes can be grown in pure culture in a lab from samples of a diseased individual
(b) When introduced to a healthy individual, a culture of the suspect microbe causes disease.
(c) The suspect microbe is absent from healthy individuals.
(d) Exposing a healthy individual to a weakened strain of bacteria induces protection from a disease.
If someone collects ribosomal sequences from a group of organisms, what is this data most useful for?
(a) Discerning ancient evolutionary relationships above the genus level
(b) Determining the types of environments where the organisms typically grow
(c) Distinguishing closely related species from the same genus
(d) Detecting horizontal gene transfer
Since the large intestine is an open system from the perspective of microbial growth, the thousands of species found in this habitat must have which adaption in order to persist there?
(a) Strictly anaerobic metabolism
(b) Growth rate higher than the rate at which material moves through the habitat
(c) Ability to grow on most foods so that population inputs to the habitat match outputs.
(d) High virulence