Bacteria from three different cultures were plated on agar plates containing ampicillin, an antibiotic. The number of colonies that grew on each plate can be seen in the graph below. If you assume that 100 bacteria were plated on each plate, what percentage of the bacteria on plate B were resistant to ampicillin?multiple choice3%0%10%100%

Look at the picture, then give the missing word in this sentence. The number of antibiotic-resistant bacteria will __________ over time.

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

In the enumeration of bacteria in a culture by a plate count, all of the following apply when determining the numbers except: Group of answer choices All bacteria in the culture are counted Statistically only plates with between 30-300 colonies should be counted It is assumed that each colony arose from division of one or a few cells All of the answer choices are correct The medium must contain nutrients used by the bacteria

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

Resistant and nonresistant E. coli bacteria samples were spread on the agar plates below and incubated for 24 hours.  The streptomycin negative with resistant E. coli. appears spread throughout the plate.The streptomycin positive with resistant E. coli. appears spread throughout the plate.The streptomycin negative with non-resistant E. coli. appears spread throughout the plate.The streptomycin positive with non-resistant E. coli. appears concentrated at three points on the plate. Select the true statements from the list below.Check All That ApplyThe resistant E. coli strain grows on streptomycin negative plates.The resistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows the same on streptomycin positive or negative plates.The nonresistant E. coli strain grows the same on streptomycin positive or negative plates.The resistant E. coli strain grows on streptomycin positive plates.The resistant E. coli strain grows on streptomycin positive plates.Both resistant and nonresistant E. coli strain show no growth on streptomycin positive plates.