Which of the following statements is NOT true of lophophorates?
A. Their tentacles serve both in respiration and in feeding.
B. They have a U-shaped digestive tract.
C. They have a true coelom.
D. There are three phyla of them: Phoronida, Bryozoa, Brachiopoda.
E. They are parthenogenetic.
E. They are parthenogenetic.
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The production of cholera toxin by virulent strains of Vibrio cholera is dependent upon genes in a bacteriophage. This is an example of
A. bacterial transformation. B. induction. C. transduction. D. lysogenic conversion.
If a process kills 90% of the organisms per minute, how many minutes would it take to kill all organisms when starting with 100,000 organisms?
A. 1 minute B. 2 minutes C. 3 minutes D. 6 minutes
When a species' numbers are so severely reduced that it is in imminent danger of extinction throughout
all or a significant part of its range, it is called:a. extinct. b. extant. c. endangered. d. threatened. e. endemic.
All else equal, the theoretical justifications for a particular function form should be stronger in the cases in which you are:
A. attempting to identify correlations only. B. running fixed effects regressions. C. extrapolating further off the support of the data. D. using an instrumental variable.