Visual accommodation involves adjustment to the shape of the _____
a. conjunctiva c. orbit
b. retina d. lens
D
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Diploid (2n) cells in the ____ of mosses, ferns, gymnosperms, and angiosperms divide meiotically and form haploid (1n) spores
Fill in the blank with the appropriate word.
DNA duplication occurs during
a. interphase. b. prophase I. c. prophase II. d. interkinesis.
A fish that has been salt-cured subsequently develops a reddish color. You suspect that the fish has been contaminated by the extreme halophile Halobacterium
Which of these features of cells removed from the surface of the fish, if confirmed, would support your suspicion? 1. the presence of the same photosynthetic pigments found in cyanobacteria 2. cell walls that lack peptidoglycan 3. cells that are isotonic to conditions on the surface of the fish 4. cells unable to survive salt concentrations lower than 9% 5. the presence of very large numbers of ion pumps in its plasma membrane A) 2 and 5 B) 3 and 4 C) 1, 4, and 5 D) 2, 3, 4, and 5
Given the following LD50 values for Bacillus anthracis, through which portal of entry is it easiest to get anthrax?
A) ingestion: 1 million endospores B) All are equally easy portals of entry. C) cutaneous: 50 endospores D) inhalation: 20,000 endospores