In response to growth hormone, which organ produces secondary growth factors?
a. hypothalamus
b. heart
c. liver
d. pineal
e. anterior pituitary
ANSWER: c
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Rotifers possess
a. cilia. b. a mouth. c. protonephridia. d. nerve cells. e. all of these.
Explain how a complex trait, such as eyes or the ability to fly, can evolve by incremental modifications over time
What will be an ideal response?
The actin filament system extends outside of the cell
a. true b. false
Suppose that a mutant organism is unable to make the amino acid arginine. Knowing that the metabolic pathway to production of arginine is ornithine ? citrulline ? arginosuccinate ? arginine, you test the ability of the mutant to grow in the presence of each one of these compounds, providing just one of the compounds in each of your tests. Also suppose that you find that the mutant can grow in the presence of arginosuccinate or arginine, but NOT in the presence of citrulline or ornithine. From this information, which step in the metabolic pathway do you think is blocked?
a. citrulline to arginosuccinate b. arginosuccinate to arginine c. ornithine to citrulline d. ornithine to arginosuccinate