The diagram below shows the human chromosomes in a diploid cell. Chromosome #1 appears to have which of the following locations for its centromere?
a) acrocentric
b) metacentric
c) submetacentric
d) telocentric
Ans: b) metacentric
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Visible light has a wavelength range of
A. 400-740 nanometers. B. 200-800 nanometers. C. 200-400 nanometers. D. 200-740 nanometers. E. 0.001-100,000 nanometers.
The ability of humans to resist a disease is called
A) dormancy. B) immunity. C) resistance. D) susceptibility.
Which of the following structures DOES NOT occur in a series of successive segments of an earthworm?
A. crop B. nerve cord C. setae D. circular muscles E. metanephridia
In bluegill fish populations three different reproductive morphs (parental, sneaker, and satellite) coexist. What is a potential ultimate reason for the coexistence of these morphs?
a. The populations are polymorphic for "parental," "sneaker," and "satellite" alleles. b. An immature male's nutritional status triggers "parental," "sneaker," and "satellite" developmental pathways. c. Successful "parental" males must exert substantial amounts of energy for brood care and defense; nutritionally disadvantaged males may optimize their fitness by becoming "sneaker" males instead. d. The fitness of "cheaters" like "sneaker" and "satellite" males is frequency dependent. e. C and D.