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Overgrowth of the skin bacterium Proprionibacterium acnes may lead to _________.

The cytoplasmic membrane of bacteria _________.

Sulfate-reducing bacteria (SRB) are very important in the cycling of sulfur within ecosystems because significant amounts of sulfate are present in almost all aquatic and terrestrial habitats, making SRB widespread and active.

Mitochondria differ from hydrogenosomes in that _________.

Clostridium  causes which of the following?

Archaeal cell walls _________.

A water source that shows a blackening in color and exudes an odor of rotten-egg is due to sulfate reduction in that environment.

Microbiologists study a variety of organisms, but all are considered either Bacteria or Archaea.

Extant microorganisms are organisms from the fossil record that are no longer present on Earth today.

The term used to describe bacteria that are shaped like curved rods is _________.