Quiz 13 - Chapter 21 Micro

What is a key distinguishing characteristic of Mycoplasmas, such as Mycoplasma pneumoniae?

They lack a cell wall

What are the two distinct morphological forms that Chlamydia species alternate between during their life cycle?

Elementary body and reticulate body

Periodontal disease primarily affects

The soft tissues and bone surrounding the teeth

What is a common early symptom of Lyme disease that may appear as a "bull's-eye" rash?

Erythema migrans

What is the role of sucrose in the development of dental caries?

It is a key substrate for bacteria to produce acids and form plaque

What is the typical habitat of Helicobacter pylori?

The human stomach

What are L-forms?

Bacterial variants that have lost their cell walls

Mycoplasma pneumoniae is a common cause of:

Atypical pneumonia, also known as "walking pneumonia"

A common symptom of Rocky Mountain Spotted Fever, especially on the palms and soles, is a

Maculopapular rash

What characterizes Rickettsiales?

Obligate intracellular parasites

Which stage of syphilis is characterized by the appearance of a red or brown rash that can cover the entire body, including the palms and soles?

Secondary syphilis

Which disease is caused by Treponema pallidum?

Syphilis

Which stage of syphilis is characterized by gummas, which are rubbery lesions that can affect various organs and bones?

Tertiary syphilis

Which bacterium is the causative agent of cholera, a severe diarrheal disease?

Vibrio cholerae

How do Vibrio vulnificus and Vibrio parahaemolyticus primarily cause disease?

Consumption of raw or undercooked seafood

Which Chlamydia species is a major cause of sexually transmitted infections, leading to conditions like urethritis and cervicitis, and can also cause eye infections (trachoma)?

Chlamydia trachomatis

What is a characteristic of Campylobacter jejuni?

It is a common cause of bacterial enteritis, often acquired from contaminated poultry

Gingivitis, an early stage of periodontal disease, is characterized by

Inflammation and bleeding of the gums

What is Helicobacter pylori most famously known for causing?

Stomach ulcers and gastritis

Which of the following is a primary bacterial genus associated with the initiation of dental caries?

Streptococcus

How long after infection does the primary lesion of syphilis, a painless chancre, typically appear?

Within 3 months

Which vector transmits the spirochete responsible for Lyme disease, Borrelia burgdorferi?

Ticks

What distinguishes Bejel, yaws, and pinta from syphilis?

Sexual transmission

The process of dental caries involves bacteria fermenting sugars to produce

Acids that demineralize tooth enamel

Which ocean is not among the typical morphology descriptions of spirochetes

Rod-shaped with endospores

Dental plaque is primarily composed of

A sticky biofilm containing bacteria, salivary proteins, and complex carbohydrates

What primarily causes the taxigenic diarrhea in cholera?

A toxin that activates cAMP, leading to massive fluid and electrolyte loss

What is a common vector for Rickettsial diseases?

Ticks

What disease is caused by Rickettsia rickettsii?

Rocky Mountain Spotted Fever