A water-vascular system is characteristic of the phylum ____
a. A water-vascular system is characteristic of the phylum ____.
b. Annelida
c. Chordata
d. Mollusca
e. Echinodermata
ANSWER: e
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Neurotransmitters are released into the _______ while hormones are released into the _______.
a. synaptic cleft; brain b. bloodstream; synaptic cleft c. synaptic cleft; bloodstream d. None of the above
In the Tewsbury and Nabhan study, which animals were observed most likely to eat the hot peppers?
A. cactus mice B. pack rats and thrashers C. thrashers. D. Cactus mice, pack rats, and thrashers all ate the peppers equally. E. pack rats
The anticancer drug taxol acts to
a. block microtubule organizing centers. b. stabilize microtubules and thus inhibit disassembly. c. block microtubule assembly by binding to free tubulin. d. accelerate microtubule disassembly by binding to tubulin in microtubules, causing those molecules to exit the microtubule more quickly. e. Both a and c
Changes at the molecular level can turn proto-oncogenes into oncogenes. These changes cause unregulated cell division. Which disease is caused by this transformation?
A. diabetes B. leukemia C. pneumonia D. hemophilia