The bacterium that causes spotted fever rickettsiosis (RMSF) is more likely to infect a human _____.
A) If an infected tick feeds for several hours
B) When an infected tick initially penetrates the skin
C) When contaminated tick feces dry and become airborne
D) If the human is exposed to rodent feces containing the bacterium
Ans: A) If an infected tick feeds for several hours
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What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?
A. Many different types of odors bind to just a few different types of receptor molecules. B. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules. C. Odors are distinguished by the way in which they bind both olfactory and taste receptors—it is the overall "picture" generated this way that we perceive. D. None of these choices are correct.
Proteins that react specifically with the chemical structures in the antigen that induced them are called
A. determinants. B. antibodies. C. proteases. D. macroproteins.
Briefly discuss physiological mechanisms that regulate body temperature in endotherms. What will be an ideal response?
Solid tissues in animals include epithelial tissue, _______ tissue, nervous tissue, and muscle.
a. blood b. connective c. guard d. parenchymal