Which statement best describes the concept of alternation of generations?
(a) One generation of plants is skipped every other year.
(b) There are two phases, a sporophyte and a gametophyte.
(c) The parental generation alternates with a juvenile generation.
(d) A green sporophyte phase produces food for a nongreen gametophyte.
(b) There are two phases, a sporophyte and a gametophyte.
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The lipopolysaccharide (LPS) layer is found ONLY in the cell walls of
A) gram-positive Bacteria. B) gram-negative Bacteria. C) Archaea. D) Eukarya.
The collection of deleterious alleles in a population is called the
A) mutation load. B) mutation bottleneck. C) genetic load. D) genome polymorphism.
In an evolutionary classification scheme, species within one genus should
a) have identical genes b) be less closely related to one another than they are to species in another genus c) be limited to species that can interbreed d) be more closely related to one another than they are to species in another genus
This newly identified organism plays what healthy role for the skin
a. oxygen turnover due to its sulfur-deoxidizing ability b. sulfur turnover due to its chlorine-deoxidizing ability c. carbon dioxide turnover due to its ammonia-oxidizing ability d. nitrogen turnover due to its ammonia-oxidizing ability