If a pinpoint colony on blood agar after 24 hours of incubation is isolated, and if the colony is oxidase-, urease-, and indole-negative, and also exhibits bipolar staining on Gram stain, then the suspect bioterror agent is most likely:
a. Bacillus anthracis.
b. Francisella tularensis.
c. Brucella spp.
d. Yersinia pestis.
D
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You discover two species of sponge, one red and one blue, near a deep sea vent. You genetically engineer the red sponge to produce the same CAMs as the blue sponge. You then take each sponge - the blue sponge and the engineered sponge - dissociate their cells, and mix the red and blue cells together. Which of the following will you most likely observe?
A. one sponge with a red side and a blue side B. one blue sponge and one red sponge C. one sponge with blue cells and red cells randomly distributed D. a bunch of red and blue cells that stay dissociated E. one sponge with alternating red and blue layers of cells
In the Northern Hemisphere, seasonal variation in temperatures is caused mainly by ____
a. the Earth's elliptical orbit taking it closer to and farther away from the sun b. the Earth's tilt on its axis of 23.5
What do restriction endonucleases do?
a. break phosphodiester bonds b. break ester bonds c. break glycosidic bonds d. break peptide bonds e. break hydrogen bonds
Which statement correctly describes human chromosomes?
a. The haploid number is 22 b. Human gametes end up with two of each type of 23 chromosomes. c. There are 42 pairs of chromosomes. d. The diploid number is 46. e. Human gametes end up with one of each type of 22 chromosomes.