Exam 27: Microbial Interactions With Humans

Neisseria gonorrhoeae adheres to mucosal epithelial cells in the

There is a high occurrence of dental caries and high amounts of S. mutans present in the plaque of Tanzanian children.

Clostridium botulinum cannot produce toxins in improperly preserved foods.

How do dental lactic acid bacteria cause dental caries?

Endotoxins are released in large amounts only when cells lyse.

To control tooth decay in developed countries,_________ salts are commonly added to municipal drinking water and toothpastes.

What are the different categories of exotoxins, and how do they function?

The relative ability of a bacterium to harm its host is known as __________ .

Which of the following are NOT found in the gastrointestinal tract of healthy humans?

The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as_________ .

The condition that results when some organisms are shed in the bloodstream and distributed to distant parts of the body during bacterial growth in tissues is called_________.

Why are some microorganisms specialized to only certain parts of the body?

Streptococcus mutans can produce dextran when sucrose is present in the absence of the enzyme dextransucrase.

Brucella abortus grows very rapidly in the placenta of cattle, because the placenta is the only tissue with the right nutrient needed for its growth.

Virulence is the relative ability of a_________ to cause disease.

The following compounds are all produced by intestinal microflora EXCEPT

Toxic proteins released from pathogen cells as they grow are called _________.

Pathogenicity is

How do anaerobic microflora survive in the mouth although humans have a high intake of oxygen through the mouth.

A loose network of polymers extending outward from a cell is called a(n_________ .