1 .		The barrier that separates the inside of the cell from its environment is called the ______________. [Hint]
2 .		Which of the following are essential characteristics of living systems? [Hint]
3 .		The complicated mix of materials surrounded by the cell membrane in bacteria is called ___________. [Hint]
4 .		Which of the following is a proper designation of this bacterium? [Hint]
5 .		The __________ includes the living organisms together with the chemical and physical constituents of the environment. [Hint]
6 .		Microorganisms may modify their environment by [Hint]
7 .		A culture that contains only one type of microorganism is said to be [Hint]
8 .		Members of the plant group _____________ live in close association with special bacteria that form nitrogen-fixing nodules on their roots. [Hint]
9 .		The use of microorganisms to clean up pollution is called what? [Hint]
10 .		________________ is the discipline that concerns the artificial manipulation of genes and their products [Hint]
11 .		_______________ is generally considered the to first to see organisms as small as prokaryotes. [Hint]
12 .		The notion of pure culture was largely done under the leadership of __________ in Berlin. [Hint]
13 .		The use of oddly-shaped flasks to study airborne contamination of broth was done by [Hint]
14 .		The discovery that certain bacteria could fix atmospheric nitrogen is generally credited to [Hint]
15 .		Organisms that use carbon dioxide as the source of cellular carbon are called [Hint]
16 .		____________ are viruses that infect bacteria. [Hint]
17 .		Which of the following groups would be most associated with human disease? [Hint]
18 .		An assembly of populations that live in association with each other is called a microbial ___________. [Hint]
19 .		Which of the following is not one of Koch's postulates? [Hint]
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