You have been given vials of H2, Na, H2O, Hg, and CH4. What are the majority of your vials filled with?
A. molecules
B. carboxyls
C. gases
D. liquids at room temperature
Answer: A
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Which of the following is an extreme and potentially fatal response to an allergen?
a. anaphylactic shock b. hypersensitivity c. autoimmune syndrome d. systemic lupus
In which of the following excretory tubule segments in mammals does about 65 percent of the water
from the filtrate get reabsorbed?
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
What is an exception to the standard biological species concept used to define a species?
A. Natural interbreeding populations cannot be distinguished using this concept. B. Asexual species cannot be distinguished using this concept. C. Species that coevolved cannot be distinguished using this concept. D. Species that do not resemble one another cannot be distinguished using this concept.
In generalized transduction, a phage introduces a segment of donor DNA into the recipient cell. This is followed by recombination of the donor fragment with the recipient chromosome. Which of the following must occur?
A) circularization of the donor fragment before recombination B) a pair (or even number) of crossovers between the donor segment and the recipient C) degradation of one of the two strands of phage genome D) replication of the donor segment before recombination E) a single crossover between the donor segment and the recipient chromosome