Besides being used for plate counts, spread plates in combination with serial dilutions can be used as a method for isolating pure cultures. Group of answer choices True False

The name of the plating method that allows you to obtain pure cultures is calledGroup of answer choicesSelective methodchemically definedColony culture methodStreak Plate methodEnrichment method

Serial dilutions are generally made: Group of answer choices When the appropriate viable count is unknown To reduce the number of colonies to count on agar plates To reach a suitable dilution while minimizing error All of the other answer choices are correct Based on 10-fold dilutions, although other serial dilution factors are possible e.g. 100-fold

In the viable plate count method, a measured sample of a culture is evenly spread across an agar surface and incubated. Each _____ represents one _____ from the sample. A. cell, cell B. cell, colony C. colony, cell D. species, colony E. generation, cell Question 29 options:

A bacterial culture contains 106 cells/mL. A serial dilution (each 1/10) was performed to confirm the numbers through a spread plate count. How many dilutions would be required to obtain a countable number of colonies on the plate (between 30-300)? Group of answer choices 4 3 6 2 5

A student performed a spread plate count of a bacterial culture and recorded 32 and 48 colonies on duplicate plates of the 10-4 dilution. What will be the bacterial count (cfu/ml) in the original culture? Group of answer choices 8.0 x 105 4.0 x 107 8.0 x 106 4.8 x 105 3.2 x 105 4.0 x 106 4.8 x 107 8.0 x 107 4.0 x 105 3.2 x 106 4.8 x 106 3.2 x 107