In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the given alternatives. Most bacteria are ___(1)___ into two broad categories: Gram positive and Gram negative. These categories are based on their cel

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the given alternatives.

Most bacteria are ___(1)___ into two broad categories: Gram positive and Gram negative. These categories are based on their cell wall ___(2)___ and reaction to the Gram stain test. The Gram staining method, developed by Hans Christian Gram, ___(3)___ bacteria based upon the reaction of their cell walls to certain dyes and chemicals. The differences between Gram positive vs. Gram negative bacteria are ___(4)___ related to their cell wall composition. Gram positive bacteria have cell walls composed mostly of a ___(5)___ unique to bacteria known as peptidoglycan, or murein. These bacteria stain purple after Gram ___(6)___. Gram negative bacteria have cell walls with only a thin layer of peptidoglycan and an outer membrane with a lipopolysaccharide ___(7)___ not found in Gram positive bacteria. Gram negative bacteria stain red or pink after Gram staining.

Which of the following word fits the blank labeled as (2)?

1). Proposition 
2). Supposition 
3). Comformation 
4). Composition

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