What is not true about the membranes of prokaryotic organism a. The.pdf
- 1. What is not true about the membranes of prokaryotic organism? a. The general structure is a membrane serves as the main permeability barriers. b. The phospholipids of Achaea have ether linkages c. Bacteria and Eukarya have ester linkages in phospholipids in their membranes. d. The membrane is the structure where energy is generated The most important role of the prokaryotic cell wall is to a. maintain the shape of the cell. b. protect the cell from osmotic pressures. c. prevent ions from diffusing away from the cell. d. block the effects of antibiotics like penicillin. The cell wall of Gram-positive micro-organisms is different from the cell wall of Gram-negative micro-organisms because Gram-positive cell walls. a. can be decolorized with ethanol during the Gram stain technique. b. have a thin peptidoglycan layer. c. are more permeable to various molecules than the Gram-negative cell wall. d. are characterized by an outer membrane containing LPS. e. have a thick peptidoglycan layer AND are characterized by the presence of teichoic acid What statement is true about the action of antibiotics? a. Penicillin interferes with cell wall synthesis of all bacteria. b. Streptomycin and erythromycin inhibit proteins synthesis by same mechanism. c. Bacteria can defeat antibiotics by mutations that produce changed enzymes. d. Antibiotics act on the 80S ribosomes. An example of a bacterial endotoxin is a. the toxic portion of the LPS layer of bacteria. b. a toxin produced within archaeal cells. c. any substance known for its primary attack on the epidermis of mammals. d. the toxin produced in the periplasm of most bacteria. What is not true of the cell walls of archaea? a. Archaea have the S layer cell wall structure. b. Archaeal cell walls, like bacteria, are sensitive to lysozyme and penicillin. c. The cell wall of archaea consists of interlocking protein or glycoprotein. d. Archaea cell walls have paracrystalline structure. Members of the Archaea typically thrive in conditions of excessive a. heat. b. acidity. c. alkalinity. d. salinity. e. All of the choices are correct. Solution 14.c. Bacteria can defeat antibiotic action by mutations that produces different enzymes that inactive antibiotic action. 15.a. Endotoxin are not secreted but released when the cells are disrupted. LPS lipopolysaccharide layer contains a lipid and a polysaccharide. They are found in the outer membrane of Gram negative bacteria and elicit strong immune response. 16.b.Archea cell wall contains pseudo peptidoglycan. Lysozyme can break -1,4-glycosidic bonds to degrade peptidoglycan but pseudopeptidoglycan has -1,3-glycosidic bonds, rendering lysozyme useless. 17.all of the choices are correct. members of the archea are the extremophiles thriving in the extreme stressed conditions