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Chapter 27 Questions-1 - Ch 27 Multiple Choice Identify the...

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Ch 27 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which of the statements below is true about mycoplasmas? a. They are gram-negative. b. They are subject to lysis in hypotonic conditions. c. They lack a cell membrane as well. d. They undergo ready fossilization in sedimentary rock. e. They possess typical prokaryotic flagella. ____ 2. Though plants, fungi, and prokaryotes all have cell walls, we classify them under different taxonomic units. Which of the observations below comes closest to explaining the basis for placing these organisms in different taxa? a. Some closely resemble animals, which lack cell walls. b. Their cell walls are constructed from very different biochemicals. c. Some have cell walls only for support. d. Some have cell walls only for protection from herbivores. e. Some have cell walls only to control osmotic balance. ____ 3. Which of the following have been present in Earth's living organisms for the least amount of evolutionary time? ____ 4. Which of the following statements about bacterial cell walls is false? ____ 5. Which of the following statements is correct about gram-negative bacteria? ____ 6. Which of the following is the most common compound in the cell walls of gram-positive bacteria? a. cellulose b. lipopolysaccharide c. lignin d. peptidoglycan e. protein
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