Humans are the sole hosts of Salmonella enterica subtype Typhi (formerly S. typhi)
Indicate whether the statement is true or false
TRUE
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Primary productivity is affected by the availability of:
A. sunlight. B. water. C. nutrients. D. sunlight and nutrients. E. sunlight, water, and nutrients.
Chromosome segregation in metaphase I
refers to which of the following statements? a. The position where crossing over occurs is random. b. The pole that any one chromosome moves toward is completely independent of the movement of the other 45 chromosomes in humans. c. Either partner of a homologous pair of chromosomes may end up at either spindle pole. d. The sperm that fertilizes the egg is selected at random. e. None of these refer to independent assortment.
Arrange the structures through which air passes upon entering the body in the proper sequence
1) alveoli 2) bronchi 3) larynx 4) bronchioles 5) pharynx
a. 5 ? 3 ? 6 ? 2 ? 4 ? 1 b. 3 ? 5 ? 2 ? 6 ? 1 ? 4 c. 2 ? 4 ? 3 ? 5 ? 6 ? 1 d. 3 ? 6 ? 5 ? 2 ? 4 ? 1 e. 5 ? 6 ? 3 ? 4 ? 2 ? 1
Which statement best describes the reproductive isolation between populations of Rhagoletis flies, one of which is found on apple trees and the other that is found on hawthorn trees?
A) Hybrid offspring of the two populations are sterile. B) Hawthorn trees and apple trees grow in different areas, so the two populations do not encounter each other. C) Male flies of one population cannot physically mate with females from the other population. D) Apple-liking males are more likely to encounter apple-liking females than hawthorn-liking females. E) Eggs laid by female flies mated with a male from the "wrong" population do not develop.