Encystment

Definition

Encystment is the process by which a unicellular eukaryotic organism forms a cyst. This cyst acts as a protective barrier, allowing the organism to survive in unfavorable environmental conditions.

5 Must Know Facts For Your Next Test

1. Encystment is crucial for the survival of many protozoa during harsh conditions.
2. Cysts are resistant structures that can withstand desiccation, low pH, and lack of nutrients.
3. Encystment allows parasites to persist outside a host until they encounter favorable conditions or a new host.
4. The process involves significant metabolic changes and secretion of a thick wall around the cell.
5. Examples of organisms that undergo encystment include Giardia, Entamoeba, and Toxoplasma.

Review Questions

• What is the primary function of encystment in unicellular eukaryotic parasites?
• Name two environmental conditions that cysts can resist due to encystment.
• Which metabolic changes occur during the encystment process?

Related terms

Trophozoite: The active, feeding stage of some protozoan parasites.

Excystation: The process by which a cyst transforms back into its active form.

Protozoa: A diverse group of single-celled eukaryotic organisms, often parasitic.