Parasitology Lab 13
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Questions and Answers

What is the definition of parasitology?

  • The study of the different types of parasites and their habitats.
  • The study of hosts and their relationships with parasites.
  • The science that focuses on the study of parasites, their hosts, and the relationships between them. (correct)
  • The study of the immune system and its response to parasites.

    • What is a characteristic of parasites?

  • Dependence on a host organism for survival. (correct)
  • Independence from a host organism for survival.
  • Simple life cycles.
  • Slow reproductive rate.

    • What is the function of a vector in relation to parasites?

  • To cure infected organisms
  • To kill parasites
  • To transmit parasites from infected organisms to other hosts (correct)
  • To diagnose parasitic infections

    • What is an endoparasite?

    <p>A parasite that lives within the host causing infection. (A)</p> Signup and view all the answers

    What is a characteristic of Protozoa?

    <p>They are single-celled organisms (C)</p> Signup and view all the answers

    What is an opportunistic parasite?

    <p>A parasite that produces disease only in immunodeficient hosts. (A)</p> Signup and view all the answers

    How do Protozoa divide?

    <p>By binary fission, schizogony, or budding (D)</p> Signup and view all the answers

    What is a characteristic of Mastigophora or Flagellated protozoans?

    <p>They have flagella for locomotion (B)</p> Signup and view all the answers

    What is an intermediate host?

    <p>A host in which the parasite lives during its larval stage or asexually reproducing form. (C)</p> Signup and view all the answers

    What is a definitive host?

    <p>A host in which the adult or sexually reproducing form of the parasite lives. (C)</p> Signup and view all the answers

    What is the body of Mastigophora covered by?

    <p>A cuticle or pellicle (D)</p> Signup and view all the answers

    How do parasites usually feed?

    <p>By hooks, suckers, claws, teeth, or specialized mouthparts. (A)</p> Signup and view all the answers

    How do Sarcodina or Amoeboids move?

    <p>By pseudopodia (B)</p> Signup and view all the answers

    What is a characteristic of parasites' life cycles?

    <p>Complex life cycles. (A)</p> Signup and view all the answers

    What is a characteristic of Sarcodina or Amoeboids?

    <p>Pellicle is absent (C)</p> Signup and view all the answers

    What is an example of a Protozoan?

    <p>Trypanosoma (C)</p> Signup and view all the answers

    Study Notes

    Introduction to Parasitology

    • Parasitology is the science that focuses on the study of parasites, their hosts, and the relationships between them.
    • Parasites are organisms that live in or on another organism (the host) deriving food and shelter and causing harm to that host.

    General Characteristics of Parasites

    • Depend on a host organism for survival
    • Usually smaller than their host
    • High reproductive rate
    • Complex life cycles
    • Evasion of the host's immune system
    • Feed by hooks, suckers, claws, teeth, or specialized mouthparts

    General Terminology of Parasitology

    • Endoparasites: live within the host causing infection
    • Ectoparasites: live on the external surface of the host causing infestation
    • Opportunistic parasite: produces disease only in immunodeficient hosts
    • Intermediate host: in which the parasite lives during its larval stage or asexually reproducing form
    • Definitive host: in which the adult or sexually reproducing form of the parasite lives
    • Vector: usually an arthropod that transmits parasites (or other pathogens) from infected organisms to other hosts

    Types of Parasites

    Protozoa

    • Single-celled organisms
    • Either free-living or parasites
    • Lack a cell wall
    • Generally heterotrophic
    • Divide by binary fission, schizogony, or budding

    Protozoa Classification and Examples

    • Mastigophora or Flagellated protozoans:
      • Have flagella for locomotion
      • Body is covered by a cuticle or pellicle
      • Reproduction is by binary fission
      • Examples: Trypanosoma, Trichomonas, Giardia, Leishmania
    • Sarcodina or Amoeboids:
      • Movement is by pseudopodia
      • Pellicle is absent
      • Reproduction is by binary fission and cyst formation
      • Examples: Amoeba, Entamoeba, etc.

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    Description

    This quiz covers the introduction to parasites and parasitology, the science that studies parasites. It is designed for first-stage students at the College of Dentistry.

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