Phosphoric acid is tribasic, with pKa of 2.14, 6.86 and 12.4. The ionic form that predominates at pH 3.2 is

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#Question id: 15673

#XL - S Microbiology

A urine sample with more than 100,000 organisms is considered indicative of infection. A urine sample containing 5,000 bacteria, with a generation time of 30 minutes, sits for 3 hours before finally being assayed. How many bacteria will then be present within the sample?

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#Question id: 15674

#XL - S Microbiology

During which phase of the bacterial growth curve does the total number of viable cells decline?

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#Question id: 15675

#XL - S Microbiology

Shake tubes are used to determine the

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#Question id: 15676

#XL - S Microbiology

The dairy industry also sometimes uses ultrahigh-temperature (UHT) sterilization. Milk and milk products are heated at

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#Question id: 15677

#XL - S Microbiology

Ultraviolet (UV) radiation around 260 nm is quite lethal but does not penetrate

1. glass 

2. dirt films 

3. Water

March the correct answer

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#Question id: 15678

#XL - S Microbiology

Alcohols are among the most widely used disinfectants and antiseptics. They act by