Molecular techniques led to the reinterpretation of morphologically based phylogeny such that
A. echinoderms and chordates were placed in entirely different clades.
B. rotifers and nematodes were designated as closely related.
C. annelids and arthropods were designated as closely related.
D. Bilateria was designated as a monophyletic group.
E. Ecdysozoa and Lophotrochozoa were designated as clades.
Answer: E
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Which of the following protist lineages is appropriately paired with its supportive and/or protective structure?
A) Diatoms have an intricate, chalky, chambered calcium carbonate shell. B) Parabasalids have an internal support rod, made of cross-linked microtubules, that runs the length of the cell. C) Alveolates have tough plates in the cell wall that are made up of cellulose. D) Euglenoids cover themselves with tiny pebbles. E) Dinoflagellates are surrounded by a glass-like, silicone dioxide cell wall.
Horses and donkeys can interbreed, but their offspring (mules) are infertile. This is an example of what kind of reproductive isolating mechanism?
A. pre-zygotic, behavioral isolation B. pre-zygotic, temporal separation C. pre-zygotic, ecological separation D. post-zygotic E. post-zygotic, ecological separation
Which specialized stem structure does not have nodes?
a. bulbs b. stolons c. corms d. tubers e. rhizomes
Which of the following statements is NOT true about Fred Griffith's experiments?
a. Mice injected with smooth (S) bacteria die. b. Mice injected with heat-killed smooth bacteria die. c. Mice injected with heat-killed smooth bacteria and d. Mice injected with rough bacteria live. e. Smooth bacteria are transformed into harmless rough live rough (R) bacteria die.bacteria.