When human cells are placed in a hypertonic solution, water enters the cells, causing them to swell and eventually burst.
a. true
b. false
Answer: b. false
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Which of the following statements best describes the habitats of Achromobacter, Alcaligenes, and Bordetella?
a. The habitats are limited to the upper res-piratory tract of various mammals. b. The habitats vary from the soil and water environment to the upper respiratory tract of various mammals. c. The habitats are limited to the soil and water environment. d. The habitats are limited to the mucous membranes of humans and animals.
Which of the following is one of the compelling lines of evidence for the endosymbiont theory?
a. Mitochondria have their own genomes. b. Alpha-proteobacteria are often symbiotic with plants. c. Cell walls were present in prokaryote precursors. d. DNA is coiled around histone proteins.
Which one of the following taxonomic categories is defined as a group of organisms that are capable of interbreeding and producing fertile offspring?
A) class B) order C) family D) species E) phylum
Which of the following model organisms were used in experiments demonstrating that DNA was the genetic material?
A) mice B) amoeba C) humans D) tobacco plants E) bacteria and bacteriophages