Choose the best cause and effect sequence for the process of speciation by natural selection.
A. Variation --> Reproductive Isolation --> Speciation --> Mutation --> Selection
B. Variation --> Selection --> Reproductive Isolation --> Mutation --> Speciation
C. Selection --> Speciation --> Reproductive Isolation --> Variation --> Mutation
D. Speciation --> Reproductive Isolation --> Selection --> Mutation --> Variation
E. Mutation --> Variation --> Selection --> Reproductive Isolation --> Speciation
Answer: E
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One of the most common etiologic agents of lower respiratory tract infection among previously healthy patients 2 months to 5 years of age is:
a. C. pneumoniae. b. M. pneumoniae. c. S. pneumoniae. d. respiratory syncytial virus.
You have been assigned to address a problem of overpopulation of species X in a nearby county. One of the members of your team suggests introducing species Y, which is a natural predator of species X, but not normally found in the area. After some discussion, you go ahead and introduce species Y. What aspects of the hierarchical organization may be affected within a period of a several years?
A. organism, population, species B. population, species, community, biosphere C. population, species, community D. population, community
Vertebrate cells possess a protein that binds to clusters of 5-methylcytosine and ensures the gene will stay in the off position. This control of gene regulation is a result of
A. translation. B. promoter expression. C. operator suppression. D. methylation. E. enhancer expression.
Some microbes secrete small molecules that induce other microbes to settle nearby. When a certain number of individuals have assembled, the chemical signal is strong enough to induce the aggregation to respond collectively to stimuli. This process is called
A. quorum sensing B. mass-settling C. conjugation D. bioremediation E. mutualism