Which of the following would indicate the presence of plaque?
a. Presence of the bacterium E. coli in a
human’s mouth.
d. A bacterial culture from a human’s mouth
that appears purple after Gram staining.
b. A bacterial culture from a human’s mouth
that appears pink after Gram staining.
e. Non-pathogenic biofilms in a human’s
mouth.
c. Presence of cyanobacteria in a human’s
mouth.
B
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Describe how continental drift resulting in Australia being isolated in the South Pacific contributed to
biological species evolution. What will be an ideal response?
One method used to prevent disulfide bond interference with protein sequencing procedures is:
A) cleaving proteins with proteases that specifically recognize disulfide bonds. B) protecting the disulfide bridge against spontaneous reduction to cysteinyl sulfhydryl groups. C) reducing disulfide bridges and preventing their re-formation by further modifying the —SH groups. D) removing cystines from protein sequences by proteolytic cleavage. E) sequencing proteins that do not contain cysteinyl residues.
Figure 36.6B
Use the figure above to answer the following question.
The structure between "C" and "E" is the ____.
A. right AV valve B. pulmonary vein C. left AV valve D. pulmonary valve E. aortic valve
Studies using fissure water from gold-mining operations nearly 3 km deep indicate that the bacteria present use what for energy?
a. organic carbon b. sulfur c. iron d. H2