In studies of two species of barnacles in the marine intertidal zone it was observed that Chthamalus can live in the upper intertidal zone and the lower intertidal zone if Semibalanus is absent, and Semibalanus can only live in the lower zone because it is more subject to dehydration. Based on this, which of the following statements are true? Check all that apply.
_____ The realized niches of the two species differ.
_____ The fundamental niche of Chthamalus is larger than its realized niche.
_____ The fundamental niche of Chthamalus is larger than the fundamental niche of Semibalanus.
_____ The fundamental and the realized niches of Chthamalus are the same.
_____ The fundamental and the realized niches of Semibalanus are the same.
__X__ The realized niches of the two species differ.
__X__ The fundamental niche of Chthamalus is larger than its realized niche.
__X__ The fundamental niche of Chthamalus is larger than the fundamental niche of Semibalanus.
_____ The fundamental and the realized niches of Chthamalus are the same.
__X__ The fundamental and the realized niches of Semibalanus are the same.
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The pairing of chromosomes along their lengths, which is essential for crossing over, is referred to as
A. syngamy. B. synapsis. C. prophase. D. recombination. E. centromere.
Primary metabolites
A. are compounds needed for the synthesis of microbial cells in the primary growth phase. B. are compounds that accumulate during the period after primary growth phase and have no direct relationship to the synthesis of cell materials. C. include bacteriocins and other similar cytotoxic compounds. D. include compounds such as antibiotics and mycotoxins.
F+ cells ____
a. are able to conjugate with donor cells b. are able to conjugate with recipient cells c. are able to conjugate with other F+ cells
d. receive DNA during conjugation e. are infected with a virus
A female who is heterozygous for hemophilia will
a. exhibit the condition throughout her life. b. suffer from bleeding when severely stressed. c. show no signs of the disease at all. d. pass the gene on to all of her children. e. pass the gene on to only her sons.