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Eli Whitney invented the cotton gin which fueled a rise in slavery by the mid-19th century.

A city finds that its water pipes are clogged by colonies of bacteria that secrete sticky layers and cooperate metabolically. What are these colonies called?

The Supreme Court’s Dred Scott decision:

Support for the Mexican American War was was strongest in New England.

Match the bacterial structure to its role in Neisseria gonorrhoeae infection (the bacteria that causes the sexually transmitted infection gonorrhea).

Below are descriptions of real-world environments. Match the type of prokaryote would most likely dominate each environment. 

During a debate in class, one student argues: “Bacteria can’t possibly evolve as fast as eukaryotes because they don’t reproduce sexually. Without meiosis and fertilization, there’s no way to generate enough genetic variation.” Which statement would BEST correct this misconception?

In which of the following does the microbe never get completely eliminated, and exists in host tissues held in check by body defenses without causing signs and symptoms?

The term pathogen refers to 

The actual number of pathogenic microbes it takes to establish infection is called the infectious dose 50 (ID50)