Chapter 3: The Amebas

Question 1

True or False: Amebas transform from trophozoites to cysts on entry into an unsuspecting human.

Answer 1

False

Question 2

Formed stool specimens are more likely to contain which of the following?

Answer 2

Cysts

Question 3

Infections with intestinal amebas are prevalent in which of the country?

Answer 3

Underdeveloped countries with poor sanitary conditions

Question 4

What structures is (are) typical in trophozoites of E. histolytica?

Answer 4

Single nucleus with a small karyosome

Question 5

E. histolytica infection is traditionally diagnosed by finding?

Answer 5

Trophozoites and/or cysts in a suspected stool sample

Question 6

What is the infective stage of E. histolytica?

Answer 6

Cyst

Question 7

What factor is not responsible for the asymptomatic carrier state of a patient infected with E. histolytica?

Answer 7

Patient’s blood type

Question 8

Which of the following prevention measures can control the spread of E. histolytica?

Answer 8

Boiling water or treat with iodine crystals

Question 9

What is the main difference between the trophozoites of E. hartmanni and E. histolytica?

Answer 9

Trophozoites of E. hartmanni do not contain ingested red blood cells

Question 10

True or False: The organism E. hartmanni is found worldwide.

Answer 10

True

Question 11

What trophozoites does have a typical nucleus consists of a large, often irregularly shaped karyosome that is eccentrically located?

Answer 11

Trophozoites of E. coli

Question 12

True or False: E.coli is considered to be a pathogen.

Answer 12

False

Question 13

True or False: Cysts of E. polecki contain at least four nuclei

Answer 13

False

Question 14

Infection with E. polecki is mainly transmitted to humans via?

Answer 14

Ingestion of E. polecki cysts

Question 15

What is usually the appearance of an E. nana karyosome?

Answer 15

Blotlike

Question 16

True or False: E. nana is prevalent in areas in which poor hygiene and substandard sanitary conditions exist.

Answer 16

True

Question 17

Iodamoeba bütschlii cysts typically:

Answer 17

Lack chromatid bars

Question 18

Transmission of I. bütschlii occurs when:

Answer 18

The infective cysts are ingested in contaminated food or drink

Question 19

It is a unique characteristics of E. gingivalis.

Answer 19

E. gingivalis is the only ameba that may ingest white blood cells

Question 20

What ameba is can be found in the mouth and in the genital tract?

Answer 20

Entamoeba gingivalis

Question 21

Ameboid trophozoites, flagellate forms, and cysts, what amebas morpholigic form it is?

Answer 21

Naegleria fowleri

Question 22

The specimen of choice for the recovery of N. fowleri is?

Answer 22

Cerebrospinal fluid

Question 23

Humans most often contract N. fowleri by _____?

Answer 23

Swimming in contaminated water

Question 24

The ameboid trophozoites of N. fowleri enter the human body through all of the following routes except:

Answer 24

Ingesting contaminated food and drink

Question 25

Providing education and awareness in the medical community, is practical measures for the control and prevention of what ameba?

Answer 25

Naegleria fowleri

Question 26

The term acanthropoda refers to:

Answer 26

Spinelike pseudopods

Question 27

The specimen of choice for diagnosing Acanthamoeba species trophozoites and cysts is ____?

Answer 27

Cerebrospinal fluid

Question 28

Human may acquire this ameba by aspiration or nasal inhalation of the organisms and by swimming or bathing in contaminated water, what ameba is this?

Answer 28

Acanthamoeba species

Question 29

Infections with Acanthamoeba species are encountered in ____?

Answer 29

Eye

Question 30

To prevention infection with Acanthamoeba species, contact lens wearers should avoid ____?

Answer 30

Using homemade nonsterile saline solutions