You have a small population of beetles. One day a large rainstorm causes flooding and wipes out 87% of the population. The remaining individuals have much lower genetic variation than the original population
Which of the following would explain the lack of H-W
equilibrium seen after the flood?
A. founder effect
B. random mating
C. small population size
D. genetic drift
E. migration
D
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If a region of DNA contained numerous mismatches due to a modifying agent that caused methylation of guanine, which of the following mutagens is most likely the cause?
A. Ionizing energy such as gamma radiation B. An intercalating agent such as acridine orange C. A DNA modifier such as an alkylating agent D. A deaminating base such as nitrous oxide
When an apical meristem cell divides, one daughter cell is called the initial and the other is called the derivative. What are the fates of these cells?
a. The initial is used to form primary meristems, and the derivative remains part of the apical meristem. b. Both the initial and the derivative remain part of the apical meristem. c. The initial remains part of the apical meristem, and the derivative is used to form primary meristems. d. Both the initial and the derivative are used to form primary meristems. e. The initial is used to form primary meristems, and the derivative is used to form secondary meristems.
Which test is used to identify antigens on red blood cells for blood typing?
A. ELISA B. Precipitation C. Western blot D. Agglutination E. Microarrays
Neurotransmitters that open Na+ channels and trigger action potentials in receiving cells are called
A) inhibitory. B) excitatory. C) sympathetic. D) parasympathetic.