The group of bacteria that can be described as being normal inhabitants of soil and water and primarily responsible for the decomposition of plant material is:
a. Rhodococcus.
b. Nocardia.
c. Gordonia.
d. Tsukamurella.
B
Nocardia are normal inhabitants of soil and water and are primarily responsible for the decom-position of plant material. Infections caused by Nocardia spp. are found worldwide. Because they are ubiquitous, the isolation of these organisms from clinical specimens does not always indicate infection.
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Species turnover on islands has been observed to be low. What does this suggest about process in the equilibrium model of island biogeography?
A. Facilitation is of minor importance to this model. B. Secondary succession rarely succeeds. C. Succession on most islands is a fairly orderly process. D. The intermediate disturbance hypothesis can explain colonization rates. E. Immigration of new species often can not keep up with extinction.
An elderly man with chronic heart and lung disease develops Legionella pneumonia. By what route was the infection most likely to have been acquired?
a. Respiratory route, from an infected person b. Inhalation of aerosolized water from a source containing protozoa c. Inhalation of spores from moldy hay d. Exposure to livestock or animal products
The original impetus to sequence the human genome was to investigate
A) how the four nitrogenous bases encode information. B) how people vary. C) how cancer arises. D) the effects of exposure to low-level radiation on the genetics of populations.
The active site of DNA polymerase is similar
a. in archaea and bacteria only b. in archaea, bacteria, and eukaryotes c. in archaea and eukaryotes only d. in none of these groups e. in bacteria and eukaryotes only