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What are two reasons microbes will produce toxins?
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- Why is it incorrect to say that bacteria produce toxins to harm their host?Which statement among A-D is false regarding bacterial toxins? A) O Hemolysıns are cell membrane disrupters that can rupture red blood cells. B) O Second mesengar pathway disrupters like cholera toxin produces a debilitating respiratory condition of the lungs. C) O Shiga toxin, tetanus toxin, and hemolysins are all types of exotoxins. D) O Superantigens elicit a hyperactive response by the immune system and can lead to shock. E) O None are false, A-D are all true statements.Which of the following is true of selective toxicity? O 1) It refers to the process of determining the correct dose of a particular drug O 2) To be effective, an antimicrobial agent must be more toxic to the patient than 2) the pathogen O 3) It contributes to antibiotic resistance O 4) It refers to the body's ability to protect the brain and eye 5) It takes advantage of metabolic and structural differences between host and pathogen
- Substances that are naturally produced by certain microorganisms that can either inhibit or destroy other microorganisms are called: a)semisynthetic drugs b) narrow-spectrum drugs c) antibiotics d) synthetic drugsWhich of the following is a viral disease that destroys the immune system? A) anemia B) HIV-AIDS C) asthma D) tuberculosisPathogenic microbes that cause disease in health care settings fall under which category of organisms? O 1) Normal flora O 2) True pathogens O 3) opportunists 3) O 4) Nosocomial
- Endotoxin is associated witha) Gram-positive bacteria.b) Gram-negative bacteria.c) the cytoplasmic membrane.d) endospores.Which one of the following is not correct? * a) Biocompatibility is the ability of a material to perform within an appropriate host response. b) Bioactivity is the characteristic that not allows the material to form a bond with living tissue c) Biodegradability is the breakdown of O the implant due to chemical or cellular interaction. O d) all of aboveFoodborne pathogens often require the presence of a large number of microbes before an active infection results. These microbes would have a high A.) median infectious dose (ID50). B.) incubation period. C.) virulence. D.) median lethal dose (LD50). E.) mortality.
- A suspected pathogen is observed from the blood of a diseased mouse. An investigation of the other mice in the area indicates that it is not present in healthy mice. With Koch's postulates in mind, what is the next step to determine whether or not this suspected pathogen is the cause of disease in the mouse? a) Grow the suspected pathogen in a pure culture Ob) Re-isolate the suspected pathogen and show that it is the same as the original pathogen c) Inoculate a healthy mouse with the suspected pathogen O d) Determine whether the organism in the pure culture is the same one as in the original sampleA pathogen that has an extremely low LD50 would be A.) very contagious. B.) very communicable. C.) very deadly. D.) very difficult to treat. E.) very oncogenic.How is it that we are not in a state of continuous infection from the microbes we encounter every day?