Microbiology and Parasitology Introduction Quiz

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Questions and Answers

What is the main difference between biologic vectors and mechanical vectors?

Mechanical vectors are more efficient at transmitting parasites than biologic vectors.
Biologic vectors carry more parasites than mechanical vectors.
Biologic vectors carry parasites only after development within the vector organism, while mechanical vectors transport the parasite directly to another host. (correct)
Mechanical vectors carry parasites that have undergone development within the vector organism, while biologic vectors do not.

How does the Aedes mosquito transmit parasites to another susceptible host?

By carrying the parasite directly from the infected host to the susceptible host.
After the parasite has undergone development within the Aedes mosquito and reached the L3 stage. (correct)
By transmitting parasites at the L1 stage directly to another susceptible host.
By ingesting parasites from an infected host and transmitting them unaltered to another susceptible host.

Which of the following correctly describes mechanical vectors?

They transport parasites directly to another host without development within the vector organism. (correct)
They are more common in transmitting filariasis.
They can only transmit parasites at the L3 stage.
They carry more parasites than biologic vectors.

What type of organisms can act as mechanical vectors for transmitting enteric organisms to humans?

Flies and cockroaches that feed on fecal material. (C) Signup and view all the answers

Which statement best describes a parasite?

An organism that grows, feeds, and shelters on or in a different organism without contributing to the survival of the host. (B) Signup and view all the answers

'Phoretic vectors' are most similar in function to which of the following?

'Hitchhikers' that carry parasites on their bodies without being affected by them. (C) Signup and view all the answers

What happens when an Aedes mosquito sucks blood from a filariasis patient?

The parasite undergoes several stages of development from L1 to L3 before transmission occurs. (A) Signup and view all the answers

How do flies and cockroaches contribute to the transmission of enteric organisms to humans?

By feeding on contaminated material and carrying enteric organisms on their bodies. (C) Signup and view all the answers

'Biologic vectors' and 'mechanical vectors' can be distinguished by which factor?

'Biologic vectors' only transmit parasites after development within themselves, while 'mechanical vectors' transport them directly. (A) Signup and view all the answers