Parasitology and Microbiology Concepts Quiz
29 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which groups asexually replicate in the primary host?

  • Protozoa and Helminths.
  • Helminths and Bacteria.
  • Viruses only.
  • Bacteria, Viruses, Fungi, and Protozoa. (correct)
  • What is the defining characteristic of Parasitism?

  • The parasite is usually the larger organism.
  • The parasite is metabolically dependent on the host. (correct)
  • Both organisms benefit from the relationship.
  • The host is always a plant.
  • What does subclinical infection refer to?

  • Infection with severe symptoms.
  • Infection with no effect on the host.
  • Infection that benefits the host.
  • Infection with no clear signs; subtle performance losses. (correct)
  • What is a characteristic of Trematoda (Flatworms: Flukes)?

    <p>Blind pouch digestive tract and hermaphroditic reproductive system.</p> Signup and view all the answers

    Why is accurate communication regarding parasites important?

    <p>To identify the Genus and sometimes species names of parasites.</p> Signup and view all the answers

    Which of the following groups do not asexually replicate in the primary host?

    <p>Helminths and Arthropods.</p> Signup and view all the answers

    What is the free-living infectious stage of nematodes?

    <p>Infective larva develops in the egg and hatches in the environment</p> Signup and view all the answers

    What is the first step in the indirect life cycle of nematodes?

    <p>Egg or embryo or larva ingested by or penetrates intermediate host</p> Signup and view all the answers

    What is the role of the snail in the life cycle of trematodes?

    <p>The snail is the intermediate host where the larval stages develop and replicate</p> Signup and view all the answers

    What is the infective stage of trematodes that is ingested by the definitive host?

    <p>Metacercaria</p> Signup and view all the answers

    What is the relationship between the definitive host and the intermediate host in the life cycle of advanced tapeworms?

    <p>The definitive host is a predator of the intermediate host</p> Signup and view all the answers

    What is the sexually mature form of a parasite known as?

    <p>Adult stage</p> Signup and view all the answers

    Which of the following is an example of a cestode that requires an intermediate host?

    <p>Taenia</p> Signup and view all the answers

    Which type of host is accidentally infected by a parasite but does not allow the parasite to continue development?

    <p>Paratenic host</p> Signup and view all the answers

    What is the term for the movement of immature parasite stages within the tissues of a host?

    <p>Larval migration</p> Signup and view all the answers

    Which type of vector is necessary for pathogen development?

    <p>Biological vector</p> Signup and view all the answers

    In which life cycle does the parasite require an intermediate host?

    <p>Indirect life cycle</p> Signup and view all the answers

    What is the first step in the general helminth life cycle?

    <p>Contamination of the host's environment</p> Signup and view all the answers

    Which of the following is NOT a characteristic of tapeworms (Cestoda)?

    <p>Dioecious (having separate sexes)</p> Signup and view all the answers

    Which of the following arthropod groups has adults with 8 legs?

    <p>Arachnida</p> Signup and view all the answers

    What is the term used to describe an infection where sexually mature parasites are generating offspring?

    <p>Patency</p> Signup and view all the answers

    Which of the following is NOT a reason for understanding parasite life cycles?

    <p>Determination of parasite taxonomy</p> Signup and view all the answers

    What is the term used to describe the developmental/maturation time needed between infection and the production of offspring?

    <p>Prepatent period</p> Signup and view all the answers

    Which of the following arthropod groups includes lice and fleas?

    <p>Insecta</p> Signup and view all the answers

    What is the role of the 2nd intermediate host (fish or frog) in the life cycle of primitive tapeworms (Spirometra)?

    <p>Develops into a 3rd larval stage (pleurocerecoid)</p> Signup and view all the answers

    What is the first step in the life cycle of primitive tapeworms (Spirometra)?

    <p>Eggs are passed in the feces of the definitive host</p> Signup and view all the answers

    Which host ingests the free-living larval stage (coracidium) in the life cycle of primitive tapeworms?

    <p>1st intermediate host (crustacean)</p> Signup and view all the answers

    When does the infective larval stage develop in the intermediate host in the life cycle described?

    <p>After ingestion by the 2nd intermediate host</p> Signup and view all the answers

    What triggers the ingestion of infective larva by the definitive host?

    <p>Consuming the 1st intermediate host</p> Signup and view all the answers

    Study Notes

    Parasitology

    • Parasitism: intimate relationship between two hetero-specific organisms, where the parasite is metabolically dependent on the host.

    Groups of Organisms

    • Protozoa: unicellular
    • Helminths: worms
    • Arthropods: "bugs"
    • Microbes: Bacteria, Viruses, Fungi

    Parasite Effects on Host

    • Continuum of effects: no effect, subclinical infection, clinical infection
    • Clinical judgement: assessing whether the effect on the patient is significant enough to justify treatment

    Classification of Parasites

    • Based on morphology
    • Protozoa:
      • Apicomplexa: coccidians and hemosporidians
      • Mastigophora: mucoflagellates and hemoflagellates
    • Helminths:
      • Nematoda (Roundworms): body cavity, pass-through alimentary canal, surface cuticle, dioecious
      • Trematoda (Flatworms: Flukes): no body cavity, blind pouch digestive tract, surface tegument, hermaphroditic
    • Arthropods:
      • Arachnida: adult stage has 8 legs, larval stage has 6 legs (e.g., mites, ticks)
      • Insecta: adult stage has 6 legs, some with wings (e.g., lice, fleas, flies)

    Life Cycles of Helminths

    • General cycle: contamination, development of preinfective stages, infection, maturation of adult stage
    • Nematodes:
      • Direct life cycle: no external stages, infective larva develops in egg
      • Indirect life cycle: egg or embryo/ larva ingested by or penetrates intermediate host
    • Trematodes:
      • Require snail intermediate hosts
      • Life cycle: egg passed in feces, larval stage develops in snail, infective larva (metacercariae) develops
    • Cestodes (Tapeworms):
      • Require intermediate hosts
      • Direct life cycle: infectious stage develops in environment
      • Indirect life cycle: larval stage develops in intermediate host

    Importance of Life Cycles

    • Control of disease
    • Diagnosis of disease and parasite identification
    • Prediction of disease
    • Prevention of cross-host infection and zoonosis
    • Environmental management to minimize host infection
    • Timing of treatment and repeat treatment

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge on general concepts in parasitology and microbiology, including parasitism, infectious groups of organisms, and asexual replication in the primary host.

    More Like This

    Use Quizgecko on...
    Browser
    Browser