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- 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.Gram-positive (+) and gram-negative (-) bacteria are characterized by differences in a. the cell wall: gram+ have peptidoglycan, gram– have pseudopeptidoglycan. b. the plasma membrane: gram+ have ester-linked lipids, gram–have ether-linked lipids. c. the cell wall: gram+ have a thick layer of peptidoglycan and gram– have an outer membrane. d. chromosomal structure: gram+ have circular chromosomes, gram– have linear chromosomes.Most bacteria have a cell wall made of peptidoglycan, the structure of which makes the cell wall very strong. Explain the specific components that make up the bacterial cell wall which give it strength and protection
- 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.. Peptidoglycan is a molecule unique to bacteria that provides strength to the cell wall. The Gram-positive cell wall is composed of a relatively thick layer of peptidoglycan as well as teichoic acids. Gram-negative cell walls have a thin layer of peptidoglycan and a lipopolysaccharide-containing outer membrane. Penicillin and lysozyme interfere with the structural integrity of peptidoglycan. What is the significance of lipid A?Which of the following is NOT a true statement about bacterial structure and function? A. Bacteria can have membrane-enclosed organelles such as mitochondria or chloroplasts B. Bacteria have a single circular chromosome made of double-stranded DNA C. Bacterial cell walls are made of a substance called peptidoglycan D. Bacterial flagella rotate to propel the cell E. Some bacteria have a capsule surrounding the cell, made of a sticky polysaccharide or protein
- Penicillin inhibits bacterial growth by preventing the cross-linking during peptidoglycan synthesis. Why does penicillin not inhibit growth of archaeal cells? Group of answer choices Most archaeal cells have a cell wall, but it is not composed of peptidoglycan. Archaeal cells do not have a cell wall. Penicillin is unable to penetrate the lipid outer membrane that blocks access of penicillin to the peptidogycan crosslinking enzymes. Pencillin is unable to penetrate the S layer to reach the peptidoglycan layer underneath.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 plantsWhich 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.
- Which of the following statement about 3 bacterial cell wall is incorrect Peptidoglycan consists of long polysaccharide chainscross-linked with amino acids. The cell wall establishes a bacterium as a coccus, bacillus, or spirillum. The cell wall is relatively nonpermeable and restricts the passage of sugars and amino acids. Gram- negative cells have a membrane both inside andoutside their cell walls. Gram-positive cells have more peptidoglycan in their cell walls gram-negative cellsGram staining is a common technique used to differentiate two large groups of bacteria based on their different cell wall constituents. The Gram stain procedure distinguishes between Gram positive and Gram negative groups by coloring these cells red or violet. Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls, which retains the crystal violet these cells are stained with. Alternatively, Gram negative bacteria stain red, which is attributed to a thinner peptidoglycan wall, which does not retain the crystal violet during the decoloring process - s. epidermidis a gram-positve coccus - E. coli a gram-negative bacillus - C. xerosis a gram-positive bacillus How does each organism fulfill a specific niche based on the information provided above?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 membranes