Which hormone stimulates insect growth and molting?
a. ecdysiotropin
b. juvenile hormone
c. histamine
d. pheromone
e. ecdysone
e
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The masseter muscles originate on your cheekbones and insert into the posterior corners of the mandible (the lower jaw bone) underneath your ears. Will contraction of the masseter muscles open or close your jaw?
A. Close B. Open
Hox genes have been identified in:
a. bilaterally symmetric animals only. b. radially symmetric animals only. c. asymmetric animals only. d. both asymmetic and radially symmetric animals only. e. both bilaterally symmetric and radially symmetric animals only.
Which of these is not a characteristic of fishes?
A. single-loop blood circulation B. gills C. pulmonary veins D. nutritional deficiencies
Morphological and genetic comparisons group 30 species of snapping shrimp (genus Alpheus) into 15 pairs of closely related species. What is the best explanation for the fact that one member of each pair lives on the Atlantic side of the Isthmus of Panama, whereas the other member of each pair lives on the Pacific side?
a. The pairs of species arose by allopatric speciation when the Isthmus of Panama separated their ancestral species. b. Different predator pressures in the Atlantic and Pacific selected for differences that resulted in the reproductive isolation of these species. c. These 15 pairs of species illustrate the pattern of punctuated equilibrium in which most speciation events take place in a short period of time. d. When these pairs meet in a hybrid zone, the reinforcement of reproductive barriers maintains each as a separate species. e. The 30 species of snapping shrimp evolved by sympatric speciation before the Isthmus of Panama formed