Antihistamines relieve allergy symptoms by ____
a. inhibiting the release of histamines and cytokines
b. binding directly to histamines
c. destroying mast cells before they can produce histamines
d. binding to the allergens
e. stimulating effector T cells to produce more cytokines
ANSWER: a
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Consider the following figure (Figure 24.5): From the data you can infer that:
A. Braincase volume is correlated with body size in the Homo lineage, but not in the extant great apes lineage. B. Species in the Homo lineage have larger body size than species in the extant great apes lineage. C. The extant great ape lineage shows the greatest amount of range in body size D. The Homo lineage shows the greatest amount of change in body size. E. Extant great apes are smarter than Australopithecines.
List several types of fossils. Why are they more commonly found in sedimentary rock?
What will be an ideal response?
At the start of the breeding season, male stickleback fish undergo a number of significant changes
Their bellies become bright red and they become aggressive toward other males of the species, establishing and defending territories in which they build their nests. Although most male-male encounters consist solely of the resident lunging at an intruder, if this fails to drive off the intruder, the resident may bite. Females choose to mate with males that have large territories and well-constructed nests. What would you expect to happen as nest sites become scarcer? A) The incidence of biting and other aggressive behaviors will increase. B) Females will begin to choose mates that have no territories. C) The color of the males will fade. D) Nest construction will deteriorate. E) Males will make their territories even larger.
In what way are semisynthetic penicillins and natural penicillins alike?
A) Both are broad spectrum. B) Both are resistant to penicillinase. C) Both are resistant to stomach acids. D) Both are bactericidal. E) Both are based on ?-lactam.