Which of the following is a chemical used by phagocytes to destroy ingested foreign substances?
A. Superoxide anion
B. Nitric oxide
C. Hydrogen peroxide
D. Lactic acid
E. All of these are used.
Answer: E
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In the 2005 peacock butterfly experiment, what was the conclusion?
a. Predatory birds are not deterred from eating peacock butterflies with spots. b. Predatory birds are deterred by peacock butterfly clicking sounds. c. Peacock butterflies with spots mated more often than those without spots. d. Predatory birds are deterred by the dark color of the peacock butterfly. e. Peacock butterflies that made clicking sounds attracted more predatory birds.
At these checkpoints a cyclin works with a cyclin-dependent kinase (i.e cdk) to regulate the checkpoint.
a. true b. false
After 20 years on the road, Roger recently retired as the drummer of a rock band. It didn't take long for Roger to realize that he was unable to hear as well as he used to. Roger's diminished hearing is most likely due to damage of
A) the tympanic membrane. B) the hammer and anvil. C) hair cells. D) corpuscles. E) the auditory nerve.
Almost all cacti are native to the Americas, but there is a small, relatively uncommon group of plants closely related to cacti native to tropical western Africa. How can we explain this given the information in this chapter?
A) This might have been caused by divergent evolution. B) The plants might have floated across the Atlantic. C) The continents were once connected. D) All of the above are true.