The condition that exists when an organism gains or loses one or more chromosomes but not a complete haploid set is known as ________

A) triploidy B) euploidy C) polyploidy D) aneuploidy E) trisomy


Answer: D

Biology & Microbiology

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The different strains of a bacterial species

A. may be susceptible to different antibiotics. B. reproduce asexually. C. may be the result of random mutations. D. can participate in conjugation and transformation. E. are described accurately by all of these statements.

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Four of the five answers represent events that occurred when free oxygen (O2) became available in the atmosphere. Select the exception

a. aerobic respiration emerged. b. some organisms changed their metabolism. c. some species that could not detoxify free radicals became restricted to the low-oxygen environments that remained. d. oxygen was toxic to many species and some cells and forms of life became extinct. e. photosynthesis was no longer a common form of energy production.

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The second structure encountered in a biopsy

of the stomach is the a. mucosa. b. submucosa. c. longitudinal muscle layer. d. circular muscle layer. e. serosa.

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Which of the following are arranged in the sequence in which the various taxa first appeared in time?

A. prokaryotes, protists, mosses, streptophytes, conifers, ferns, angiosperms B. prokaryotes, protists, streptophytes, mosses, ferns, conifers, angiosperms C. bacteria, streptophytes, protists, mosses, angiosperms, cycads D. protists, prokaryotes, streptophytes, ferns, mosses, angiosperms, conifers E. bacteria, protists, liverworts, lycophytes, streptophytes, angiosperms, gnetophytes

Biology & Microbiology