The type of excretory structures characteristic of class Turbellaria are:A
protonemas.
B. protonephridia.
C. nephridia.
D. Malpighian tubules.
E. antennal organs
B
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P. vivax is suspected in a patient who has been traveling for months in the tropics. Blood was collected in a lavender top tube; however, the slide was not prepared for examination until the next day because the specimen came in on the night shift. Once the slide was prepared and ex-amined, Schüffner dots were not visible. Which one of the following statements explains this discrepancy?
a. Schüffner dots are not characteristic of P. vivax infections. b. The blood film was most likely incorrectly prepared. c. The blood should have been collected in a red top tube. d. The blood remained in the tube too long, yielding false-negative results.
In Drosophila and Lepidoptera, sex-chromosome mosaicism produces what type of sexually ambiguous phenotype?
What will be an ideal response?
Which of the following ions is most likely to passively cross the plasma membrane of a resting neuron?
A. Na+ B. Cl- C. Mg2+ D. Ca2+ E. K+
A beekeeper opens one of his hives. At first, only one bee gets under his suit and stings him. He is then swarmed by the rest of his bees, and ends up with several stings. Why did most of the hive attack him? Select all correct choices
A. Because the first bee produced alarm pheromones. B. Because the first bee produced trail pheromones. C. Because the first bee produced amine hormones. D. Because the first bee produced steroid hormones. E. Because the first bee produced paracrine signals.