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- Which type of bacteria is responsible for producing ex-tremely toxic sulfuric acid?(a) Thiobacillus (d) Sulfur-oxidizing(b) Sulfate-reducing (e) a and d(c) Sulfur-reducing11) The sterilization method that is used to sterilize antibiotics: a) uses halogens b) Phenolics c) Irradiation d) Deep freezing method e) Ultrafiltraion 12) An internal bacterial cell division will lead to the formation of: a) Baeocyte b) Mycellia c) Syncitium d) Myofibril e) all the above13) One of the following compounds doesn’t belong to this list of agents: a) Aldehydes b)Sterilizing Gas c) Quaternary Ammonium Compounds d) Chloramphenicol e)Halogens 14) Most of the growth of bacteria through chemical compounds target: a) Proteins b) Ribosomes c) DNA d) RNA e) Cell wall 15) The antibiotic that prevent the addition of the next amino acid to a growing peptide is: a) Vancomycin b) Tetracycline c) Chloramphenicol d) Sulfonamide e) CephalosporinBacillus subtilis and Bacillus cereus most likely showed greater resistance to UV light than Serratia marcescens. This is due to: a. Bacillus spp. are Gram-positive, while Serratia marcescens is Gram-negative b. the Bacillus spp. are spore fonners c. the pigment of Serratia marcescens absorbs more radiation than other cells d. Bacillus spp. have enzymes that protect them from ozone
- Bacteria such as Mycoplasma that lack cell walls are:(a) Sensitive to penicillin(b) Resistant to penicillin(c) Protected from adverse conditions by a waxy, acid-fastcoating(d) Obligated to live inside of other cells as endosymbiontsWhen hydrogen peroxide is placed on a colony of an unknown bacterium, bubbles form. Based on this information, you can conclude that the bacteriuma) is Staphylococcus epidermidis.b) is a lactic acid bacterium.c) is beta-hemolytic.d) is catalase-positive.e) can cause strep throat.Mycobacterium tuberculosis is very difficult to stain because of the A) presence of ribosomes in the cytoplasm. B) location of the DNA within the cell. C) large amounts of a waxlike lipids present in its cell wall. D) lack of a cell wall.
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- How do Gram-negative bacteria differ from Gram-positivebacteria?a. They are not pathogenic.b. Their peptidoglycan cell wall is thinner.c. Gram-negative bacteria cannot be Gram stained.d. They possess a single plasma membrane.e. Gram-negative bacteria do not photosynthesize.Why are Pseudomonas aeruginosa infections difficult to treat? A. Because they form biofilms, which are difficult for antibiotics to penetrate. B. Because they have a special endotoxin that degrades many antibiotics. C. Because we do not have any antibiotics that target P. aeruginosa. D. Because they are gram-positive bacteria, which are harder to treat.Which group of bacteria contains the gram-positive, anaerobic bacterium that causes botulism? (a) clostridia (b) actinomycetes (c) enterobacteria (d) spirochetes (e) streptococci