Which process is used to ensure that plates contain 30 to 300 colonies at the end of plate counting methods?
a) Turbidity
b) Serial dilution
c) Filtration
d) Pour plates
Ans: b) Serial dilution
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A cell biologist examines a diploid cell from a particular species of during metaphase of mitosis and determines that 8 centromeres are present. Based on this finding, how many centromeres should be present in a single cell from this species during anaphase II of meiosis?
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about centromeres? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Francisella philomiragia differs from F. tularensis in that it:
a. is oxidase-negative. b. is hydrogen sulfide–positive. c. does not hydrolyze gelatin. d. does not grow in 6% sodium chloride.
Reptiles were better adapted to land than amphibians because they
A. can breathe using the thoracic cage. B. had legs arranged to better support their body weight. C. had watertight skin to help retain water. D. All of the choices are correct.
Which events and features are correctly associated with the roots during the pressure-flow model of phloem transport?
Select one: a. Sugar is stored in the sink. Cells use the sugar for cellular respiration. Water exits by osmosis and returns to the xylem. b. Sugars are stored in the source. Cells use the sugar for cellular respiration. Water exits by osmosis and returns to the xylem. c. Sugar is stored in the sink. Cells use the sugar for photosynthesis. Water exits by osmosis and returns to the xylem. d. Sugar is stored in the sink. Cells use the sugar for cellular respiration. Water exits by diffusion and returns to the phloem. e. Sugar is stored in the source. Cells use the sugar for photosynthesis. Water exits by osmosis and returns to the xylem.