You Are Looking at a Sample from the Top Green

question 66

Multiple Choice

You are looking at a sample from the top green layer of a colorful bacterial mat. Using phase contrast and fluorescence microscopy, you see evenly spaced cells in the middle of a filament that are slightly smaller than the others. The smaller cells are not fluorescent, indicating they lack photosystem II, but the rest of the filament is fluorescent. What type of filamentous bacteria are you most likely looking at?

• A) purple nonsulfur bacteria
• B) green sulfur bacteria
• C) Acidobacteria
• D) Cyanobacteria

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Definitions:

Independent

In statistics, refers to variables that are not affected by other variables in the context of the analysis.

Mutually Exclusive

Events or conditions that cannot occur at the same time; within the context of probability, two events that cannot both be true simultaneously.

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