MicrobiologyLesson 1 of 1 in the course The Eukaryotes of Microbiology

Protist Diversity, Protozoan Life Cycles, and Parasitic Diseases

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

This lesson introduces protists and protozoans, including their varied cell structures, ways of obtaining food, and life-cycle strategies. These ideas help explain how microscopic eukaryotes live in different environments and cause infection.

Protist is a historical, informal label for a diverse collection of microscopic eukaryotes. It is not a formal taxonomic group because organisms called protists do not all share one exclusive evolutionary origin. Some are animal-like protozoans, some are plant-like algae, and others have fungus-like characteristics. Algae may be unicellular or multicellular; protozoans are nonphotosynthetic and unicellular.

All flashcards

Holozoic feeding
Ingestion of whole food particles, often by phagocytosis.
Saprozoic feeding
Uptake of small, soluble food molecules.
Syngamy
Fusion of haploid gametes in a sexual process.
Contractile vacuole
A cell structure that helps regulate water balance.
Plasmodial slime mold
A slime mold that forms one large, multinucleate amoeboid cell.

Quiz questions

  1. What role does the apical complex play in apicomplexan parasites?Answer: It helps the parasite enter host cells.
  2. In ciliates, what is the primary role of the micronucleus?Answer: It is involved in sexual reproduction.
  3. Which insect transmits *Trypanosoma brucei*, the cause of African trypanosomiasis?Answer: A tsetse fly.
  4. How is *Entamoeba histolytica* commonly transmitted?Answer: By ingesting cysts from fecal contamination.
  5. Which cell-wall material distinguishes oomycetes from typical fungi?Answer: Cellulose.

Based on Microbiology by Nina Parker, Mark Schneegurt, Anh-Hue Thi Tu, Philip Lister, Brian M. Forster (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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