A researcher is working to generate a new cancer drug. Thus far, he has identified a compound that can reduce the size of tumors in the lung. However, in order for the drug to work, the lung tumor has to be small. In addition, the tumor cannot have metastasized (spread to other areas of the body). Furthermore, he knows that the drug acts to prohibit the signaling from one tumor cell to another tumor cell. Given the above information, this new drug prohibits:
A. paracrine signaling between tumor cells.
B. autocrine signaling between tumor cells.
C. synaptic signaling between tumor cells.
D. endocrine signaling between tumor cells.
Answer: A
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A. secrete a cuticle made of protein. B. secrete a cuticle made of calcium carbonate. C. molt during growth. D. have trochophore larvae. E. have lophophores.
Which statement is a part of the first law of thermodynamics?
a. Energy can be neither created nor destroyed.
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In animals, the evolutionary development of cephalization is most associated with ____
a. bilateral symmetry b. radial symmetry c. ganglia d. nerve nets e. nerves
The Protenor mode of sex determination is the ________
A) XO/YY scheme B) scheme based on single translocations in the X chromosome C) XX/XO scheme D) hermaphroditic scheme E) scheme based on F plasmids inserted into the FMR-1 gene