A P. bursaria cell that has lost its zoochlorellae is aposymbiotic
If aposymbiotic cells have population growth rates the same as those of healthy, zoochlorella-containing P. bursaria in well-lit environments with plenty of prey items, then such an observation would be consistent with which type of relationship?
A) parasitic
B) commensalistic
C) toxic
D) mutualistic
B
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Molecular techniques led to the reinterpretation of morphologically based phylogeny such that
A. Ecdysozoa and Lophotrochozoa were designated as clades. B. Bilateria was designated as a monophyletic group. C. annelids and arthropods were designated as closely related. D. rotifers and nematodes were designated as closely related. E. echinoderms and chordates were placed in entirely different clades.
The phenotypes of a trait controlled by the same gene are not always identical. Indicate whether the statement is true or false
Kudzu, an Asian vine introduced to the United States in the 1930s as a means to control erosion, is referred to as "the plant that ate the South" because it grows so fast and overtakes most plant species in its path
A recent and unusual way that some people are using to control kudzu growth is to allow goats to graze their land and eat the kudzu, roots and all. This is considered by some to be the most environment-friendly way to eliminate this invasive vine. How can we best describe the goats in this situation? A) a threatened species B) an invasive species C) a biological control agent D) an integrated pest management agent
If two giraffes were crossed, where one is heterozygous for albinism (a) and the other has a homozygous dominant genotype, what would be the expected genotypic and phenotypic ratios?
a) 2 AA: 2 Aa: 0 aa; all pigmented b) 1 AA: 2Aa: 1aa; 3 pigmented: 2 albino c) 2 AA: 2 Aa: 0 aa; 4 pigmented: 2 albino d) 2 AA: 0 Aa: 0 aa; all pigmented e) 0 AA: 0 Aa: 1 aa; all albino