MIP 300 Microbiology Exam 3 2023/2024 already passed

MIP 300 Microbiology Exam 3Typhoid fever - correct answer The person preparing you sub sandwich did not wash her hands when she returned from the restroom and is not wearing gloves. You are most likely to become ill if this woman has _______ and handles your sandwich with her unwashed hands. Typhoid fever - correct answer Unusual in the US today, but it is acquired through fecal-oral transmission. A relatively small inoculum is required to cause disease, but this can be transmitted by food contaminated with fecal material from the unwashed hands of a person with the disease. Hepatitis B - correct answer Enters through a break in the skin and is transmitted by sexual contact (direct contact), as well as by contaminated fomites, such as shared needles (indirect contact). Do not confuse with the other form (A), which is transmitted by ingestion of human fecal matter. Salmonellosis - correct answer Usually acquired through ingestion of undercooked poultry, meat, or eggs or unpasteurized milk. These are all animal-derived products that become contaminated by salmonellae bacteria carried by these animals. (Usually a zoonotic disease.) Less commonly acquired through direct contact via ingestion of human fecal matter because a relatively large inoculum is required to cause the disease. Toxoplasmosis - correct answer Usually acquired through ingestion of raw or undercooked meat containing cysts of the protozoan. Ingestion of cat fecal material containing oocysts of the protozoan may also result in infection. Human-to-human transmission does not occur. (Congenital infection can occur.) - ingestion of protozoan Pneumonic plague - correct answer Which of the following can be acquired through inhalation of respiratory droplets? - legionellosis - toxoplasmosis - pneumonic plague - both legionellosis and pneumonic plague - all of the above Pneumonic plague - correct answer Acquired through inhalation of respiratory droplets expelled by an animal or hunan that has either primary (1) or secondary (2) Legionellosis - correct answer Acquired through inhalation of aerosolized water droplets contaminated with bacteria Hand soap containing Triclosan - correct answer Which of the following is most likely to select for resistant strains of bacteria? - hand soap containing Triclosan - hand sanitizer containing alcohol - meat treated with ListShield bacteriophage preparation Tricloson - correct answer A phenol, not an antibiotic, and it selects for bacteria that are resistant to antibiotics. This is due to the fact that bacteria that are resistant to Triclosan use efflux pumps to remove the chemical, and these efflux pumps also pump antibiotics out of the cell. Alcohol (hand sanitizer) - correct answer Denature proteins. Bacteria cannot alter their composition so that they do not contain proteins and therefore do not become resistant to alcohol ListShield - correct answer Contains six different bacteriophages and it is unlikely that bacteria present in the meat will be resistant to all six phages. In addition, the Listeria phages are consumed, and most likely destroyed. They are not released into the environment. 1. transpeptidase (PBP2) 2. bactoprenol carrier molecule 3. NAM-NAG monomers 4. plasma - correct answer Neosporin ointment contains neomycin, streptomycin, and bacitracin. Like penicillin, bacitracin inhibits peptidoglycan synthesis, but it does so using a different mechanism. Penicillin binds to the (1) and prevents cross-linking in the peptidoglycan.