PQ12) Commented Questions for the Biomedical Competition (Parasitology) | Prof. Victor Proença - ...
In this class, we will discuss question 12 of Parasitology for the Biomedical Civil Service Exam (Parasitology - PQ12). Basic and Clinical Human Parasitology Course from IBAP Cursos.
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Content
Question 12 - Year: 2013 Board: FUNDEPES Agency: City Hall of Brumadinho - MG
Analyze the following statements about the morphological characteristics of Trypanosoma cruzi and Leishmania sp. for identification in thin blood smears and thick blood smears.
Mark the true statements with T and the false ones with F.
( ) The trypomastigote forms of T. cruzi can be identified by the position of the kinetoplast, posterior to the nucleus, and an extensive undulating membrane.
( ) The amastigote forms of Leishmania sp. are elongated and have an externalized flagellum.
( ) The epimastigote forms of T. cruzi have a juxtanuclear kinetoplast and a long undulating membrane.
( ) The promastigote forms of Leishmania sp. are easily differentiated from the trypomastigote forms of T. cruzi by the position of the kinetoplast and the absence of an undulating membrane.
Select the alternative that presents the CORRECT sequence.
Alternatives
A) T F F T. B) F T F T. C) T F T T. D) F T T F.
Justifications
( ) The trypomastigote forms of T. cruzi can be identified by the position of the kinetoplast, posterior to the nucleus, and an extensive undulating membrane. (TRUE)
Epimastigote: replicative form in the invertebrate host = elongated shape (fusiform), discoid kinetoplast arranged anteriorly to the nucleus and with free flagellum arising from the anterior region
Amastigote: replicative (intracellular) and infective (extracellular) form in the vertebrate host = rounded shape and very short flagellum
Trypomastigote: non-replicative form, infective for both types of hosts = elongated with rounded kinetoplast, posterior to the nucleus and flagellum, which runs externally along the entire length of the body
( ) The amastigote forms of Leishmania sp. are elongated and have an externalized flagellum. (FALSE)
Amastigotes: intracellular, rounded and not very mobile; flagellum is short and emerges from the flagellar pocket. The nucleus is eccentric and usually contains two nucleoli and abundant granular material lining the nuclear membrane. The kinetoplast, with a bacilliform or curved appearance, is located in front of the nucleus.
Promastigote: extracellular, elongated and free; the posterior part is thinner and the anterior end is slightly more rounded, from where the flagellum originates. This has the function of providing motility and assisting in the process of attachment to the intestinal epithelium of the insect vector, as well as to the cells of the mononuclear phagocytic system. The nucleus is located in the middle third of the cell and the kinetoplast is located anterior to the nucleus, close to the flagellar pocket.
( ) The epimastigote forms of T. cruzi have a juxtanuclear kinetoplast and a long, undulating membrane. (FALSE)
Epimastigote: replicative form in the invertebrate host = elongated (fusiform) form, discoid kinetoplast located anterior to the nucleus and with a free flagellum arising from the anterior region
( ) The promastigote forms of Leishmania sp. are easily differentiated from the trypomastigote forms of T. cruzi by the position of the kinetoplast and the absence of an undulating membrane. (TRUE)
Sequence V - F - F - V
Correct alternative: a)
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