Isotopes are atoms of the same element that differ in their
A. atomic number.
B. electron number.
C. proton number.
D. neutron number.
E. chemical properties.
Answer: D
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Select the phrases that can be associated with intersexual selection
A. peahens choosing peacocks with greater number of eyespots in their tail feathers B. males fighting males to win a territory C. mate choice D. sexual selection within a sex
The most commonly accepted tree of life suggests that, after the origin of life, which of the following events occurred?
a. Bacteria arose from the first self-replicating, metabolizing cells. b. There was a split between the bacteria and a line that gave rise to the prokaryotes and eukarya. c. The fusion of a bacterium and a virus gave rise to the eukarya. d. The fusion of a bacterium and an archaeon split from the protist line. e. None of the above
Select the best choice for the following statements using the five groups listed below.
A. All members of this group are parasitic alveolates. B. These move by means of pseudopods. C. These possess an eyespot for detecting light needed for photosynthesis. D. These are a common source of bioluminescence in tropical seas. E. Chagas disease and African sleeping sickness are caused by members of this group.
Please order the following choices to reflect the mechanism and development of an immediate (Type 1) allergic reaction.
> A provoking exposure to the allergen occurs and mast cells and basophils degranulate, releasing histamine and other allergic mediators. > Individual experiences allergy symptoms. > B cells produce IgE directed against the allergen. > IgE coats (sensitizes) mast cells and basophils. > Individual is exposed to a sensitizing dose of an allergen.