Which infectious agent risk group would Mycobacterium tuberculosis be placed in?
A. Risk group 4
B. Risk group 1
C. Risk group 2
D. Risk group 3
Answer: D
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Patients who have type 2 diabetes no longer respond normally to insulin. Which statement best explains this symptom?
A. Their cells express less insulin receptor. B. The nucleus of their cells are altered so that insulin can not bind. C. The insulin receptors on their cells have mutated. D. Type 2 diabetics do not produce insulin. E. The signal transduction pathways in the cells no longer exist.
Which product(s) are formed in lactate fermentation?
a. ethanol only b. lactate only c. ethanol and lactate d. ethanol and carbon dioxide e. lactate and carbon dioxide
Salmonella enteritidis causes a food-borne illness that kills 400 to 600 Americans each year. It is found mainly in poultry products
Rather than give large doses of antibiotics to poultry, some poultry producers infect the intestinal tract of hens with a harmless bacteria, resulting in a dramatic decrease of S. enteritidis found in the chickens. In this case, what principle did the producers use? A) mutualism B) predation C) competitive exclusion D) parasitism
You are performing a Gram stain on gram-negative bacteria and you stop after the decolorizer step. What is the appearance of the bacteria at this point?
A) purple B) red C) colorless D) brown