Jo mama number 6

31. Which labeled portion of the bacterial growth curve represents a phase in which optical density (turbidity measurements) and viable cell concentration are LEAST proportional to each other?

D

32. What is the purpose of the streak plate technique?

to obtain a pure culture from a mixed or unknown source

33. Selective medium differs from differential medium because

One permits growth of a particular microbial type the other is used to distinguish between types of organisms.

34. The north arm of the Great Salt Lake is a rich pink color due largely to the archaea that inhabit the hypersaline water, while the south arm is green in color, due to the rich diversity of photosynthetic algae species. The two arms of the Great Salt Lake are separated by a railroad causeway and the differences in color have even been observed by astronauts in the Space Station! Which term best describes the archaca in the north arm?

Halophile

35. Cultures of a bacterial species were incubated on a lab bench (25°C), in a walk-in warm room at 37°C, and in a 37°C, 5% CO, incubator. Growth was not observed under atmospheric conditions. Which term could be used to describe this species?

Capnophile