You discover a new bacterium. Its cell envelope shows high concentrations of phosphatidylethanolmine and another type of phospholipid that is associated with long polysaccharide chains of unusual sugars. This organism is likely? A. Gram-positive B. Gram-negative C. Archaea D. Eukaryote E. a or b
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- Which of the following statement about the bacterial cell wall is INCORRECT? a. The cell wall is relatively nonpermeable and restricts the passage of sugars and amino acids. b. Gram-positive cells have more peptidoglycan in theircell walls than Gram-negative cells. c. Gram-negative cells have a membrane both inside andoutside their cell walls. d. The cell wall establishes a bacterium’s shape as a coccus,bacillus, or spirillum.A bacterium has the following characteristics:∙ It adheres to the human intestinal lining using a feature that protects it from phagocytes, bacteriophages, and dehydration∙ It can survive being boiled∙ It contains no plasmids and relatively little peptidoglycanWhich of the following statements best describe the cell wall of this bacterium? Group of answer choices A. Its innermost layer is composed of a phospholipid bilayer. B. After it has been subjected to Gram staining, the cell should remain purple. C. It has an outer membrane of lipopolysaccharide. D. It is mostly composed of a complex, cross-linked polysaccharide.We will perform a gram stain on our samples, so be sure to bring your instructions on gram staining. Will this procedure stain all cells? A. Yes, all prokaryotic and eukaryotic cells will be stained purple or pink. B. All prokaryotic cells will be stained. Eukaryotic cells will not be stained. C.Mycobacteria and a few other groups with special cell wall structures will not be stained. All other prokaryotic cells will be stained. Eukaryotic cells will be stained pink. D. Mycobacteria and a few other groups with special cell wall structures will not be stained. All other prokaryotic cells will be stained. Eukaryotic cells will be stained purple.
- Which of the following statements is true? Select one: O a. Gram-positive bacterial walls have a relatively thin layer of peptidoglycan anchored to the acids O b. Peptidoglycan is a fatty acid O c. The cell walls of bacteria are composed of peptidoglycan O d. Peptidoglycan is found mainly in the cell walls of fungi, algae and plantsYou are studying the cell walls of gram-negative bacteria. You have isolated the components of their cell walls and run a chemical analysis of what you have isolated. What component listed below would be toxic to eukaryotic cells such as human cells? the peptidoglycan NAG the protein the lignin the cellulose the lipopolysaccharidesFor bacteria to infect cells, it produces an extracellular protease that destroys tissue structure particularly transmembrane proteins. The bacteria are grown in culture so that the protease can be isolated. Then the culture is centrifuged. In which sample would the protease be most likely found? A. Precipitate containing whole bacteria B. Cell-free filtrate; that is, the supernatant C. The lysate of the whole culture D. Lysed bacteria only E. All of these
- Figure 13.6 Which of the following statements is true? a. Gram-positive bacteria have a single cell wall formed from peptidoglycan. b. Gram-positive bacteria have an outer membrane. c. The cell wall of Gram-negative bacteria is thick, and the cell wall of Gram-positive bacteria is thin. d. Gram-negative bacteria have a cell wall made of peptidoglycan, while Gram-positive bacteria have a cell wall made of phospholipids.Which of these do all prokaryotes and eukaryotes share? a. nuclear envelope b. cell walls c. organelles d. plasma membraneThe surface-to-volume ratio _______. a. does not apply to prokaryotic cells. b. constrains cell size. c. is part of the cell body
- Members of the mycoplasma genus of bacteria do not have a cell wall for protection, existing with only a simple cell membrane made up of fatty acids and phospholipids. They cannot however, synthesize their own fatty acids. How is this possible? A. They use host materials B. They use peptidoglycan from other bacteria C. They use anabolism as a way to create their outer membrane D. They use amino acids to build their membranesWhich statement is false regarding bacterial cell walls? A. Both Gram positive and Gram negative bacteria contain peptidoglycan in the cell wallB. Gram negative bacteria have a thin layer of peptidoglycan and stain pinkC. Gram (+) bacteria are positively charged due to phosphate groups in teichoic acidsD. Gram (-) bacteria have an outer cell wall containing lipopolysaccharideE. Both teichoic acids and lipopolysaccharide can be used to separate bacterial speciesWhich of the following contribute(s) to the differences between the Archaea and the bacteria? O A. Archaea lack muramic acid. O B. Archaea have isopranyl glycerol ethers rather than fatty acid esters in their membrane lipids. O C. Archaea differ from bacteria in their tRNA composition, ribosome structure, antibiotic sensitivity, translation elongation factors, initiator TRNA, and DNA-dependent RNA polymerase structure. O D. all of these