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
D
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Which of the following is also known as infectious hepatitis?
A) hepatitis A virus B) hepatitis B virus C) hepatitis C virus D) hepatitis D virus
Resistance of sickle cell disease carriers to malaria illustrates
A) genetic drift. B) a population bottleneck. C) balanced polymorphism. D) a founder effect.
___________ is the separation of two complementary strands of DNA upon heating above a certain temperature.
A. Multiplexing B. Thermocycling C. Annealing D. Denaturation
The surface of a Paramecium is covered with thousands of short, hair-like ____
a. plasmadesmata b. pseudopods c. trichomes d. flagella e. cilia