Which of the following is an example of a cultured marine chemoorganotrophic bacterium that contains proteorhodopsin and is a member of the SAR11 clade?
a. Azoarcus
b. Pelagibacter
c. Prochlorococcus
d. Sagittula
Answer: B
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A change in genotype, but not in phenotype, is most likely due to
A. a point mutation in the third position of a DNA triplet. B. a nonsense mutation at the beginning of a gene. C. thymine dimer formation in the coding region of a gene. D. a mutation that leads to a frameshift in the middle of a gene.
Which organism's virulence is due to protease and gelatinase production, which causes the destruction of host cells and tissues?
a. Bergeyella zoohelcum b. E. meningoseptica c. Chryseobacterium indologenes d. Agrobacterium spp.
Bees may pick up pollen of one species on a certain place on their bodies; if this area does not come into contact with the receptive structures of the flowers of another plant species, the pollen is not transferred. This is an example of
A. ecological isolation. B. temporal isolation. C. geographical isolation. D. mechanical isolation.
Ringworm is caused by
A) worms infected with fungi invading the skin. B) dermatophytes that have invaded deep into the living tissue. C) dermatophytes growing in the outer dead tissue layers of the skin (epidermis). D) a hypersensitivity caused by superficial contact with dermatophytes. E) toxins produced by dermatophytes.