Microbiology : PreTest Self-Assessment & Review

James D. Kettering

Chapter 4 Rickettsiae, Chlamydiae, and Mycoplasmas - all with Video Answers

Educators

Chapter Questions

Problem 291

Mycoplasmas differ from chlamydiae in that they are
a. Susceptible to penicillin
b. Able to grow on artificial cell-free media
c. Able to cause urinary tract infection
d. Able to stain well with Gram's stain
e. Able to cause disease in humans

Sylvia Puglisi

Numerade Educator

00:57

Problem 292

$Q$ fever
a. Is an illness confined to the upper respiratory tract
b. Has an incubation period of 4 to 6 weeks
c. Is most commonly found in tropical regions
d. Is transmitted by the bite of an arthropod
e. Is an acute febrile illness caused by Coxiella burnetii

Tate Hilken

Numerade Educator

02:02

Problem 293

Rickettsiae, which include the spotted fevers, Q fever, typhus, and scrub typhus, are
a. Obligate intracellular parasites
b. Stable outside the host cell
c. Easily stained (Gram-negative) with a Gram stain
d. Maintained in nature with humans as the mammalian reservoir
e. The cause of infections in which a rash is always present

Ali Crampton

Numerade Educator

Problem 294

A man with chills, fever, and headache is thought to have "atypical" pneumonia. History reveals that he raises chickens and that approximately 2 weeks ago he lost a large number of them to an undiagnosed disease. The most likely diagnosis of this man's condition is
a. Anthrax
b. Q fever
c. Relapsing fever
d. Leptospirosis
e. Ornithosis (psittacosis)

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01:51

Problem 295

An ill patient denied being bitten by insects. However, he had spent some time in a milking barn and indicated that it was dusty. Of the following rickettsial diseases, which one has he most likely contracted?
a. Scrub typhus
b. Rickettsialpox
c. Brill-Zinsser disease
d. Q fever
e. Rocky Mountain spotted fever (RMSF)

Joanna Quigley

Numerade Educator

00:35

Problem 296

Which of the following mycoplasmas has been implicated as a cause of nongonococcal urethritis (NGU)?
a. Mycoplasma hominis
b. M. pneumoniae
c. M. fermentans
d. M. mycoides
e. Ureaplasma urealyticum

Emily Terlap

Numerade Educator

01:26

Problem 297

Which of the following statements best describes human monocytic ehrlichiosis (HME)?
a. The HME agent grows on artificial media
b. It is a fatal disease transmitted by the bite of a dog
c. Clinical diagnosis is based on the presence of erythema migrans (EM)
d. Symptoms include vomiting and paralysis
e. Diagnosis is usually made serologically but morulae may be seen in the cytoplasm of monocytes

Joanna Quigley

Numerade Educator

00:36

Problem 298

Lymphogranuloma venereum (LGV) is a venereal disease caused by serotype L1, L2, or L3 of Chlamydia trachomatis. The differential diagnosis should include which of the following?
a. Psittacosis
b. Chancroid
c. Shingles
d. Babesiosis
e. Mononucleosis

Emily Terlap

Numerade Educator

00:46

Problem 299

An inhibitor of ATP synthesis would be expected to retard most severely the penetration of the host cell by which of the following organisms?
a. Chlamydia psittaci
b. C. trachomatis
c. U. urealyticum
d. Rickettsia rickettsii
e. M. pneumoniae

Sam Limsuwannarot

Numerade Educator

02:10

Problem 300

C. trachomatis can be distinguished from C. psittaci by which of the following criteria?
a. C. trachomatis is sensitive to sulfonamides
b. C. trachomatis has a different lipopolysaccharide antigen
c. C. trachomatis can be stained with Giemsa
d. C. psittaci is an obligate prokaryotic parasite
e. C. psittaci forms inclusions that contain glycogen

Aflah M

Numerade Educator

01:25

Problem 301

Chlamydiae have an unusual three-stage cycle of development. The correct sequence of these events is
a. Penetration of the host cell, synthesis of elementary body progeny, development of an initial body
b. Penetration of the host cell, development of an initial body, synthesis of elementary body progeny
c. Development of an initial body, synthesis of elementary body progeny, penetration of the host cell
d. Synthesis of elementary body progeny, development of an initial body, penetration of the host cell
e. Synthesis of elementary body progeny, penetration of the host cell, development of an initial body

Bryan Valdivia

Numerade Educator

01:17

Problem 302

Rickettsiae are Gram-negative bacteria that cause a wide range of diseases. The agent of Rocky Mountain spotted fever (RMSF) is best characterized by the statement that it
a. Grows on $7 \%$ sheep blood agar
b. Has an "atypical" Gram-negative cell wall
c. Is energy-deficient and cannot phosphorylate glucose
d. Is normal flora of the mosquito gut
e. Is susceptible to penicillin

Rikhil Makwana

Numerade Educator

01:26

Problem 303

Human granulocytic ehrlichiosis (HGE) is a disease transmitted to humans by the bite of a tick, Lxodes scapularis. Which of the following statements about HGE is most correct?
a. Clinical diagnosis is based on the presence of erythema migrans
b. HGE is a self-limiting disease
c. HGE is caused by Ehrlichia chaffeensis
d. The causative organism can be grown on ordinary laboratory media
e. HGE is characterized by an acute onset of fever, severe headache, and influenzalike symptoms

Joanna Quigley

Numerade Educator

02:35

Problem 304

The "spotted fever" group of rickettsial diseases is caused by a variety of rickettsial species. While not critical for treatment of disease, the speciation of these organisms is essential for epidemiologic studies. Of the following rickettsiae, which one is found in the United States and is a member of the spotted fever group?
a. Rickettsia sibirica
b. R. conorii
c. R. akari
d. R. prowazekii
e. R. australis

Ali Crampton

Numerade Educator

Problem 305

A 36-year-old man presents at his physician's office complaining of fever and headache. On examination, he had leukopenia and increased liver enzymes, and inclusion bodies were seen in his monocytes. History revealed that he was an outdoorsman and remembered removing a tick from his leg. Which of the following diseases is most likely causing the symptoms described?
a. Lyme disease
b. Ehrlichiosis
c. Rocky Mountain spotted fever
d. $Q$ fever
e. Tularemia (Francisella tularensis)

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02:02

Problem 306

Typhus, spotted fever, and scrub typhus share which of the following manifestations of disease?
a. Short incubation period $(<48 \mathrm{~h})$
b. Fever, rash, and rickettsemia
c. Common vector
d. Similar geographic distribution
e. Arthritis

Ali Crampton

Numerade Educator

01:05

Problem 307

C. trachomatis is a well-known cause of venereal disease. This organism is also implicated in which of the following?
a. Classic trachoma infection
b. Sexually transmitted cardiac disease in adults
c. Perinatal retinitis
d. Middle-ear infection in young children
e. Urinary tract infection in children

Emily Terlap

Numerade Educator

01:45

Problem 308

Which one of the following statements best characterizes lymphogranuloma venereum (LGV)?
a. The causative agent is $C$, trachomatis
b. In the United States, it is more common among women
c. It is most common in temperate regions
d. Penicillin is effective in early treatment
e. The disease (LGV) does not become chronic

Joanna Quigley

Numerade Educator

02:01

Problem 309

Trachoma is one of the leading causes of blindness. Which of the following best typifies the disease?
a. It is caused by C. trachomatis
b. It is best treated with systemic cephalosporins and ophthalmic tetracycline
c. It affects 400 million people in the Pacific Rim
d. It is a form of chronic uveitis
e. Chlamydial eye infection is a major veterinary problem

Brett Donadeo

Numerade Educator

00:17

Problem 310

Chlamydiae are small Gram-negative rods once thought to be viruses. Which of the following best characterizes chlamydiae as distinct from viruses?
a. Independent synthesis of proteins
b. Susceptibility to antimicrobial agents
c. Intracellular reproduction
d. Synthesis of ATP
e. Cannot visualize with light microscope

Sabihah Khan

Numerade Educator