A fisherman who cut himself on a fishing hook later develops a cutaneous disease at the inoculation site. The exudate is aspirated and set up on a routine AFB medium for culture. It is incubated at 37°C, but no growth is observed after 8 weeks; however, a slide of the exudate was AFB-positive. Which one of the following statements explains these findings?
a. The infection is most likely the result of a viral infection.
b. The organism should have been incubated at 30°C.
c. The organism should have been incubated at 42°C.
d. The infection is most likely fungal in na-ture.
B
The organism is M. marinum, which grows best at 30°C. If specimens are obtained from skin or superficial lesions suspected to contain M. marinum or M. ulcerans, then an additional set of solid media should be inoculated and incubated at 25°C to 30°C.
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You are studying a protein in Salmonella typhimurium that you believe is a toxin. Whenever you attempt to purify the protein from lysed cell cultures, you get two forms of the protein
One form is smaller than the other and is missing 15 amino acids from the N-terminus compared to the larger form. This leads you to hypothesize that A) there are two termination sites in the mRNA. B) the protein requires chaperonins to fold properly. C) the protein is secreted and folds outside of the cell. D) you need to re-do the experiment because there should only be one form.
An individual who is attracted to light is exhibiting
(a) negative phototaxis. (b) positive phototaxis. (c) negative thigmotaxis. (d) positive thigmotaxis.
Morphological or molecular characters shared by members of a clade are called ______
A) common ancestors B) paraphyletic groups C) homoplasys D) monophyletic groups E) synapomorphies
Mitosis results in perfect duplication of cells. Meiosis results in a shift from ________ to _________.
Fill in the blank(s) with the appropriate word(s).