Sponges are believed to have arisen from the choanoflagellates because they possess:A
amebocytes.
B. spicules.
C. spongin.
D. collar cells.
E. oscula.
D
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Vincristine is a cancer chemotherapy drug. It binds to tubulin dimers, inhibiting assembly of microtubules. Where do you predict that vincristine stops the cell cycle?
A. S phase B. Prophase C. Metaphase D. Telophase
The addition of a strong acid like HCl to an aqueous solution would result in
A. the release of H+ into the solution. B. an increase in pH. C. a decrease in pH. D. both the release of H+ and an increase in pH. E. both the release of H+ and a decrease in pH.
A horseshoe-shaped crown of tentacles used by many invertebrates for feeding is called a
A. protostome. B. fimbrium. C. lophophore. D. trochophore. E. rhizophore.
An unidentified cell was found to contain introns and exons. It also expresses DNA polymerase and RNA polymerase. Although it exhibits a promoter region, it has no operons. You conclude that this cell
A. is either a prokaryotic or eukaryotic cell. B. is actually a virus. C. is eukaryotic. D. is prokaryotic.