What is the goal number of CFUs on a spread plate if a serial dilution is done correctly?

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

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

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

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

A student performed a spread plate count of a bacterial culture and recorded an average of 460 colonies after plating the culture directly on duplicate agar plates and and average of 62 colonies with the 10-1 dilution duplicate plates. What will be the bacterial count (cfu/ml) in the original culture? Group of answer choices 4600 620 6200 460 540 5400 answer oin;lu