Download Mycoplasms

Mycoplasmas, Rickettsia, Chlamydia and Spirochettes
Which of the following statements concerning the classification of mycoplasmas is correct?
A. They stain Gram-positive but are genetically similar to Gram-negative bacteria.
B. They stain Gram-negative and are genetically similar to Gram-negative bacteria.
C. They stain Gram-negative but are genetically similar to Gram-positive bacteria.
D. Mycoplasmas are not really bacteria.
Why is primary atypical pneumonia often called "walking" pneumonia?
A. Because in the 19th century, people acquired it from walking in the cold winter air.
B. Because patients can cough productively only when they walk around.
C. Because patients with it exhibit much milder symptoms than those of other types of
pneumonia.
D. Because it is spread easily among family members and other close contacts.
Which of the following is a cause of nongonococcal urethritis?
A. Ureaplasma urealyticum
B. Mycoplasma hominis
C. Mycoplasma genitalium
D. Both A and C are correct.
E. A, B, and C are correct.
Why is penicillin useless in treating mycoplasma infections?
A. Mycoplasmas metabolize penicillin too quickly for it to have any effect on the cell.
B. Most species of Mycoplasma have become resistant to penicillin.
C. Penicillin does not enter Mycoplasma cells readily.
D. Mycoplasmas do not have a cell wall.
All of the following are pieces of evidence supporting the cellular nature of rickettsias EXCEPT:
A. they reproduce via binary fission.
B. they contain functional ribosomes.
C. they have a typical bacterial cell wall.
D. they contain DNA and RNA.
The symptoms of Rocky Mountain spotted fever are a result of
A. the host immune response against R. rickettsii.
B. rickettsial toxins.
C. damage to blood vessels.
D. All of these contribute to the symptoms of RMSF.
Which of the following organisms causes scrub typhus?
A. Ehrlichia
B. Orienta
C. Leptospira
D. Helicobacter
Which of the following is classified as an emerging disease?
A. latent syphilis
B. human monocytic ehrlichiosis
C. peptic ulcers
D. Lyme disease
Lymphogranuloma venereum is associated with infections of which of the following?
A. Campylobacter jejuni
B. Chlamydia trachomatis
C. Chlamydia pneumoniae
D. Treponema pallidum pertenue
Which of the following can produce blindness especially in children?
A. Chlamydia trachomatis
B. Chlamydia psittaci
C. Chlamydia pneumoniae
D. All of the above are correct.
A widespread rash extending to even the soles of the feet is associated with
A. primary syphilis.
B. tertiary syphilis.
C. secondary syphilis.
D. latent syphilis.
All of the following are nonvenereal treponemal diseases EXCEPT:
A. yaws.
B. ornithosis.
C. pinta.
D. bejel.
Arthritis is a major symptom of which of the following diseases?
A. cholera
B. Lyme disease
C. epidemic typhus
D. relapsing fever
Relapsing fever can be transmitted by all of the following EXCEPT:
A. lice.
B. ticks.
C. fleas.
D. All of these can transmit relapsing fever.
Which of the following is a zoonosis?
A. cholera
B. trachoma
C. leptospirosis
D. bejel
Why is Vibrio cholerae the most likely cause of cholera contracted from contaminated drinking water?
A. It is the only species of Vibrio that is found worldwide.
B. It is the only species of Vibrio that can survive in fresh water.
C. It is the most virulent species of Vibrio.
D. It is the only species of Vibrio that can survive exposure to stomach acid.
Cholera toxin
A. is composed of three types of subunits.
B. produces rice-water stools.
C. inactivates adenylate cyclase.
D. Both B and C are correct.
E. A, B, and C are correct.
Septicemia can result from infections with
A. Vibrio vulnificus.
B. Vibrio cholerae.
C. Vibrio parahaemolyticus.
D. All of these can cause septicemia.
Campylobacter jejuni is the most common cause of which of the following diseases in the U.S.?
A. typhus
B. bacterial gastroenteritis
C. ulcers
D. pneumonia
All of the following are virulence factors that allow Helicobacter pylori to colonize the stomach EXCEPT:
A. flagella.
B. exotoxins.
C. reticulate bodies.
D. adhesins.