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Questions and Answers
How do amoeba acquire food?
How do amoeba acquire food?
- By absorbing nutrients from the environment
- Through photosynthesis
- By engulfing food with their mouths
- Through the use of pseudopodia (correct)
Which genera of amoeba are commonly found in the intestinal tract of humans and domestic animals?
Which genera of amoeba are commonly found in the intestinal tract of humans and domestic animals?
- Entamoeba, Endolimax, and Iodamoeba (correct)
- Entamoeba, Acanthamoeba, and Naegleria
- Naegleria and Acanthamoeba
- Sarcodina and Protozoa
What is the most important feature that separates amoeba from other groups of protozoans?
What is the most important feature that separates amoeba from other groups of protozoans?
- Ability to undergo photosynthesis
- Formation of karyosomes
- Lack of defined shape
- Presence of pseudopods in their trophozoite form (correct)
How do amoeba replicate?
How do amoeba replicate?
What is the routine lab diagnosis for identifying amoeba?
What is the routine lab diagnosis for identifying amoeba?
What are karyosomes in relation to amoeba?
What are karyosomes in relation to amoeba?
What is the major pathogen causing amebic dysentery?
What is the major pathogen causing amebic dysentery?
What is the infective stage of Entamoeba histolytica?
What is the infective stage of Entamoeba histolytica?
How do people get infected by Entamoeba histolytica?
How do people get infected by Entamoeba histolytica?
What is the characteristic feature of Entamoeba histolytica's trophozoite?
What is the characteristic feature of Entamoeba histolytica's trophozoite?
In which part of the body does excystation occur after ingesting Entamoeba histolytica cysts?
In which part of the body does excystation occur after ingesting Entamoeba histolytica cysts?
What does Entamoeba histolytica require to complete its life cycle?
What does Entamoeba histolytica require to complete its life cycle?
What is the stage produced from excystation in the small intestine?
What is the stage produced from excystation in the small intestine?
What may trophozoites do after growing and multiplying in the large intestine?
What may trophozoites do after growing and multiplying in the large intestine?
What can occur if Entamoeba histolytica perforates the intestinal wall?
What can occur if Entamoeba histolytica perforates the intestinal wall?
What is a diagnostic specimen for Entamoeba histolytica?
What is a diagnostic specimen for Entamoeba histolytica?
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Study Notes
Amoeba and Food Acquisition
- Amoebas acquire food through a process called phagocytosis, engulfing bacteria, yeasts, and other small organisms.
Amoeba Genera in Intestinal Tract
- Genera of amoebas commonly found in the intestinal tract of humans and domestic animals include Entamoeba and Endolimax.
Key Feature of Amoebas
- The most important feature that separates amoebas from other groups of protozoans is their ability to form pseudopodia.
Amoeba Replication
- Amoebas replicate through a process called binary fission, where the cell divides into two identical daughter cells.
Lab Diagnosis for Amoeba
- The routine lab diagnosis for identifying amoebas involves microscopical examination of stool or biopsy specimens.
Karyosomes
- Karyosomes are clusters of chromatin that condense to form nuclei in amoebas.
Pathogen Causing Amebic Dysentery
- The major pathogen causing amebic dysentery is Entamoeba histolytica.
Infective Stage of Entamoeba histolytica
- The infective stage of Entamoeba histolytica is the cyst.
Transmission of Entamoeba histolytica
- People get infected by Entamoeba histolytica through the fecal-oral route, often by consuming contaminated food or water.
Characteristics of Entamoeba histolytica's Trophozoite
- The characteristic feature of Entamoeba histolytica's trophozoite is its ability to form pseudopodia.
Excystation
- Excystation occurs in the small intestine after ingesting Entamoeba histolytica cysts.
Life Cycle of Entamoeba histolytica
- Entamoeba histolytica requires a human host to complete its life cycle.
Excystation Stage
- The stage produced from excystation in the small intestine is the trophozoite.
Trophozoite Behavior
- Trophozoites may multiply and grow in the large intestine, then penetrate the intestinal wall and enter the bloodstream.
Complications of Entamoeba histolytica Infection
- If Entamoeba histolytica perforates the intestinal wall, it can lead to peritonitis or liver abscesses.
Diagnostic Specimen
- A diagnostic specimen for Entamoeba histolytica is a stool or biopsy sample.
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