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Which of the following is not a disadvantage of the direct microscopic count?
Sample volume is unknown
36 colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
Which section shows a growth phase where the number of cells dying equals the number of cells dividing?
A culture medium on which only gram-positive organisms grow and a yellow halo surrounds Staphylococcus aureus is called a(n)
A and B
Which of the following is the best definition of generation time?
The length of time it takes for a cell to divide
Which group of microorganisims is most likley to spoil a freshwater trout preserved with salt?
WHich of the following is an example of metabolic activity that could be used to measure microbial growth?
An experiment began with 4 cells and ended with 128 cells. How many generations did the cells go through?
Three cells with generation times of 30 minutes are inoculated into a culture medium. How many cells are there after 5 hours?
3 x 2^10
Producers in the hydrothermal vents on the ocean floor use CO2 for their carbon souce and what for energy?
Assume you inoculated 100 cells into 100 ml nutrient broth. You then inoculated 100 cells of the same species into 200 ml nutrient broth. After incubation fo 24 hr, you should have
The same number of cells in both
Micrococci are facultative halophiles. Which line best depicts the growth of M. luteus in a nutriend medium containing 7.5% NaCl
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