Four of the following are major features of arthropods. Which is the exception?
a. jointed appendages
b. exoskeleton
c. paired segmental nephridia
d. specialized segments that are fused together
e. specialized sensory structures
ANSWER: c
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If we were to discover beings on a distant planet that looked very much like us, it would probably be
cited as an example of
a. coincidence. b. convergent evolution. c. homology. d. adaptive radiation. e. genetic drift.
To which of the following groups does the organism
in the above figure belong? a. diplomonads, parabasalids, trypanosomes, and euglenoids b. ciliates, dinoflagellates, and apicomplexans c. water molds, diatoms, and brown algae d. chlorophyte and charophyte algae e. amoebas and slime molds
A human fecal sample is examined and found to contain a few strobila. The person is probably infected with
A) Echinococcus granulosus. B) Giardia intestinalis. C) Taenia. D) Schistosoma. E) Necator americanus.
Which transcription factors are normally bound to the Psf promoter in the presence of both Mg2+ and Ca2+?
(a) MetA and MetB (b) MetB and MetC (c) MetA and MetC (d) MetA, MetB, and MetC