A problem with __________ of cell number is that dead cells also scatter light.
a. direct microscopic counts
b. viable counts
c. spread plate counts
d. pour plate counts
e. optical density measurements
Answer: Optical density measures
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Microbiology Chapter 4
- How do some cyanobacteria fix nitrogen while growing aerobically?
- Some bacteria form environmentally resistant forms called __________.
- Which of the following genera does NOT undergo differentiation?
- During biofilm formation, as more and more cells bind to the surface, they begin sending signals to each other in a process called
- Which of the following is true of all biofilms?
- Eukaryotic microorganisms enter the __________ phase at much lower cell numbers than bacteria simply because they are bigger than bacteria.
- You are measuring growth in a bacterial culture. The number of viable cells remains constant, and when you check the medium, you find that the carbon source has been used up. What phase of growth is the culture in?
- E. coli adjusts to the stationary phase by doing all of the following except:
- Quorum sensing begins during which growth stage?
- During which stage of bacterial growth is the culture growing exponentially?
- In which case would the shortest lag period most likely be observed?
- The time between inoculation and the beginning of growth is usually called the:
- If an organism produces seven offspring per generation, which of the following would express the rate of increase in population, where n corresponds to the number of generations?
- The time interval required for the formation of two cells from one is called the
- A cafeteria worker who fails to wash his hands thoroughly and fails to wear gloves inoculates a quiche with 4 E. coli when he uses his finger to test whether it is done. By the time you purchase the quiche, there are 128 E. coli cells in it. How many generations did the cells go through?
- Growth of most microorganisms occurs by:
- ____ cells are free-living organisms that grow and multiply on their own.
- What type of growth pattern is represented here: 5 × 103; 1 × 104; 2 × 104; 4 × 104; 8 × 104?
- When the population doubles during each given unit of time the growth is
- Which of the following is the best technique for counting only viable cells?
- ______ intercalates between DNA bases, causing dead cells to stain red under a fluorescence scope.
- All of the following are true about MacConkey medium except:
- Metabolism of a microbe is best examined by growing the organism in a:
- Which term refers to the condition in which a culture covers the entire plate surface?
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