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Unformatted text preview: 1 1 Exam ii Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of these is the most common compound in the cell walls of gram- positive bacteria? 1) _______ A) lignin B) cellulose C) lipopolysaccharide D) peptidoglycan E) protein 2) Which statement about the genomes of prokaryotes is correct ? 2) _______ A) Prokaryotic cells have multiple chromosomes, packed with a relatively large amount of protein. B) The prokaryotic chromosome is not contained within a nucleus but, rather, is found at the nucleoid region. C) Prokaryotic chromosomes are sometimes called plasmids. D) Prokaryotic genomes are diploid throughout most of the cell cycle. E) Prokaryotic genomes are composed of linear DNA (that is, DNA existing in the form of a line with two ends). The following question refer to structures found in a gram- positive prokaryotic cell. 3) Not present in all bacteria, this cell covering enables cells that possess it to resist the defenses of host organisms: 3) _______ A) sex pilus B) capsule C) endospore D) flagellum E) cell wall 4) Which of these statements about prokaryotes is correct ? 4) _______ A) Bacterial cells conjugate to mutually exchange genetic material. B) The persistence of bacteria throughout evolutionary time is due to their genetic homogeneity (i.e., sameness). C) They divide by binary fission, without mitosis or meiosis. D) Their genetic material is confined within a nuclear envelope. E) Genetic variation in bacteria is not known to occur, nor should it occur, because of their asexual mode of reproduction. 1 2 5) Carl Woese and collaborators identified two major branches of prokaryotic evolution. What was the basis for dividing prokaryotes into two domains? 5) _______ A) metabolic characteristics such as the production of methane gas B) ecological characteristics such as the ability to survive in extreme environments C) genetic characteristics such as ribosomal RNA sequences D) metabolic characteristics such as chemoautotrophy and photosynthesis E) microscopic examination of staining characteristics of the cell wall 6) Protists are alike in that all are 6) _______ A) unicellular. B) symbionts. C) autotrophic. D) eukaryotic. E) monophyletic. 7) The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the following?...
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