Archaea have been found in many microenvironments in the human body. Which of the following microenvironments is most likely to fit with the designation of Archaea as "extremophiles?"
A. The inner ear can withstand increased pressure.
B. The gingiva and the gut are anaerobic.
C. The temperature of the testes is less than 37°C.
D. The surface of the tongue has salt receptors.
Answer: B
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According to the endosymbiosis hypothesis
A. the first endosymbiotic event involved an anaerobic bacterium. B. the mitochondrion evolved from the same endosymbiont as the hydrogenosome. C. the first endosymbiont was a fermentative organism. D. All of the choices are correct.
In order to understand the driving force of ATP synthase in chloroplasts, researchers broke open chloroplasts, isolated
the thylakoid membrane and measured ATP synthesis under different light conditions. What were the results of this experiment?
a. ATP production occurred only in light, suggesting that the light is directly responsible for the activation of ATP synthase. b. ATP production occurred only in light, suggesting that the light is indirectly responsible for the activation of ATP synthase. c. ATP production occurred only in dark, suggesting that the light directly inhibits ATP synthase. d. ATP production occurred only in dark, suggesting that the photons of light act as allosteric (non-competitive) inhibitors of ATP synthase. e. ATP production occurred only in dark, suggesting that the light is indirectly responsible for the activation of ATP synthase.
Diploid cells of the fruit fly Drosophila have ten chromosomes. How many chromosomes does a Drosophila gamete have?
a. 1 b. 2 c. 5 d. 10 e. 20
Where would one expect to find the most telomerase?
A. a nerve cell from a 60-year-old individual B. a nerve cell from a 2-year-old individual C. male germ cells that give rise to gametes D. skin cells from a 2-year-old individual E. skin cells from a 60-year-old individual