Which Microbial Grouping Is the Major Oxygenic Phototroph in Most

question 11

Multiple Choice

Which microbial grouping is the major oxygenic phototroph in most salt lakes?

• A) cyanobacteria
• B) Dunaliella, a eukaryotic alga
• C) halophilic Archaea
• D) purple nonsulfur bacteria

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Definitions:

Concentration Ratio

A measure of the market share controlled by the largest firms within an industry, used to indicate the degree of market competition.

Market Share

The percentage of an industry's sales that a particular company controls.

Herfindahl-Hirschman Index

A measure of market concentration used to determine the level of competition within an industry, calculated by summing the squares of the market shares of all firms in the market.

Marginal Revenue

The additional income that is gained from selling one more unit of a good or service, crucial for businesses when deciding how much to produce.