Which of the following must bring in a virion-associated RNA-dependent RNA polymerase when it infects host cells?
A. +ssRNA viruses
B. -ssRNA viruses
C. All of the choices are correct.
D. +dsRNA viruses
Answer: B
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You are employed by the Natural History Museum of Chicago as a wildlife biologist. You recently completed an expedition to Indonesia where you discovered a new and very colorful species of beetle. Based on observations, you hypothesize that sexual selection may be playing a role in the evolution of this species. Which of the following observations would support your hypothesis?
A. Males defend territories. B. Female preference for larger, brighter males. C. Male beetles are bigger and more brightly colored than females. D. All of the above observations would support your hypothesis.
Aldosterone acts on the kidneys by:
A) increasing potassium reabsorption into the blood and enhancing sodium elimination in the urine. B) dilating the renal vasculature, thus enhancing renal blood flow and facilitating sodium excretion. C) increasing sodium reabsorption into the blood and enhancing potassium elimination in the urine. D) constricting the renal vasculature, thus slowing renal blood flow and decreasing the glomerular filtration rate
Neurons rely on glial cells for
a. protection. b. metabolic support. c. insulation. d. All of the above
Which of the following pathways are operational in a cell growing via fermentation?
A) glycolysis, intermediate step, and the Krebs cycle B) glycolysis and intermediate step only C) glycolysis D) intermediate step E) Krebs cycle