Which of the following is NOT an antimicrobial feature of the urinary system?
A) physiological valves found in the ureter
B) pH of the urine
C) flushing action of urine
D) the use of the urethra for seminal fluid in women
E) None of the answers is correct; all of these are antimicrobial features of the urinary system.
D
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Part of the ability of S. mutans to produce dental caries depends on its ability to
A. invade plaque and dissolve the gums. B. convert sucrose to lactic acid. C. convert proteins to sugars. D. attach to the gums.
A student carries out PCR using the following steps: Step 1: 94°C for 1 minute Step 2: 60°C for 30 seconds Step 3: 72°C for 30 seconds Which of the following lists the CORRECT terms for these three steps?
A. denaturation of the double-stranded template, extension of the new DNA molecules, primer annealing B. degradation of the template, primer annealing, extension of the new DNA molecules C. denaturation of the double-stranded template, primer annealing, extension of the new DNA molecules D. denaturation of the double-stranded template, extension of the new DNA molecules, hybridization of the template E. hybridization of the single-stranded templates, primer annealing, extension of the new DNA molecules
If a population of 100,000 microbes has been treated with antimicrobials for 2 minutes and 90% of the population dies per minute, how many microbes remain after 2 minutes?
A. 100,000 B. 10,000 C. 1000 D. 100
3 types of study designs
What will be an ideal response?