Amoeba Flashcards
What is the cellular structure of bacteria?
Unicellular and prokaryotic
Bacteria do not have a nucleus, mitochondria, endoplasmic reticulum, or Golgi bodies.
What type of organisms are fungi?
Heterotropic eukaryotes, most are multicellular
Fungi can be classified as molds or yeasts.
What are the characteristics of viruses?
Acellular, not a cell, contain DNA or RNA, require a host, obligate intracellular parasites
Viruses do not replicate independently.
What types of organisms can parasites be?
Some are unicellular, some are multicellular
Parasites depend on a host for nutrients.
What is Parasitology?
Study of parasites and organisms that live in and obtain nutrients from another organism
It examines the dependence of one living organism on another.
Fill in the blank: Bacteria are considered _______.
prokaryotes
True or False: Fungi can produce all the nutrients they need.
False
Fungi are heterotropic and cannot produce all nutrients.
Fill in the blank: Viruses require a _______ to replicate.
host
What are the two phases of parasitic life cycles?
The route follows within the body and the route follows independent of human
What is the nomenclature format for parasites?
Genus species; mention the whole name initially, then abbreviate when mentioned again
What are the three major groups of clinically significant parasites?
- Protozoa
- Metazoa
- Arthropods
What are protozoa?
Unicellular parasites
How are protozoa classified?
Based on the locomotory structure they have
What are the classifications of protozoa based on locomotory structures?
- Sarcodine - Pseudopods
- Mastigophora - Flagellates
- Cilia
- Apicocomplexa - non-motile
What are metazoa?
Multicellular parasites
What are the two main types of metazoa?
- Nema - thread
- Platy - flat
What is an amoeba?
Unicellular and under subkingdom protozoa; has pseudopods
What is the trophozoite stage of an amoeba?
Feeding stage; delicate, fragile, susceptible to the environment, and easily destroyed by gastric juices
What is a cyst in the context of amoeba?
Non-feeding stage; has a thick protective cell wall, more resistant to environmental stress, and is the infective stage
What is the first step in the life cycle of Amoeba?
Ingesting cysts and infecting the small intestine
Which genus of Amoeba is known to be pathogenic?
Entamoeba
What process do cysts undergo to become trophozoites?
Excystation
Where do trophozoites go after excystation?
Into the large intestine, into the bloodstream
What happens to trophozoites after they multiply?
They undergo encystation and go into stool/feces