the time between inoculation and the beginning of growth is usually called the a
ID: 213586 • Letter: T
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the time between inoculation and the beginning of growth is usually called the a. lag phase b. early log phase c. late log phase d. stationary phase e. death phase 29. A cafeteria worker who fails to wash his handsthoroughly an with four E. coli cells when he uses his finger to test whether it quiche, there are 128 E coli cells in it. How many generations did the cells go fails to wear gloves inoculates a quiche Whether it is done. By the time you purchase the d. 32 e. 64 c. 30. I f an organism produces seven offipring per generation, which of the following would express the in population where n corresponds to the number of generations? b. c. 7 Which of the following is true of all biofilms? 2n e. 31. They only contain a single species. b. The EPS may be protein or polysaccharide. c. Cells in the biofilm are dormant until the bacteria leave the biofilm. d. a. The EPS is secreted by the bacteria. It is a continuous monolayer surface deposit. e. During biofilm formation, as more and more cells bind to the surface, they begin sending signals to e other in a process called: a. quorum sensing b. homoserine lactone sensing c. siderophores iron acquisition 32. d. polysaccharides uptake e. density sensing 33. Some bacteria form environmentally resistant forms called a. endospores b. heterocysts d. hyphae e. actinomycetes c. colonies 34. How do some cyanobacteria fix nitrogen while growing aerobically? a. b. c. d. e. They don't, because nitrogenase is destroyed by oxygen. They use special cells called heterocysts that protect the enzyme. They use cysts that protect the enzyme. They do it using no special structures or mechanisms. They live symbiotically with other organisms that protect the enzyme. possess nitrogenase, which converts N2 to ammonium ions (NHt) 35 a. Nitrogen fixers b. Denitrifiers c. Nitrifiers d. All of the above possess nitrogenase e. None of the above possess nitrogenaseExplanation / Answer
1. Lag phase
2. 5
3. 2n
4. They only contain a single species
5. Quorum sensing
6. Endospores
7. They don't because nitrogenase is destroyed by oxygen
8. Nitrogen fixers
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