Question 1

Which of the following best describes why helminths are studied by microbiologists, even though they are multicellular animals?

Accepted Answer

Helminths have life stages that are microscopic and can be diagnosed and studied using microbiological techniques.

Question 2

A patient presents with fever, chills, and cycles of severe anemia after returning from a trip to sub-Saharan Africa. Which pathogen is most likely responsible, and how is it transmitted?

Accepted Answer

Plasmodium species, transmitted by Anopheles mosquitoes.

Question 3

Which of the following best describes a mycelium?

Accepted Answer

A mass of hyphae that forms the vegetative body of a fungus.

Question 4

Which of the following is a correct sequence for the stages of Ascaris infection in humans?

Accepted Answer

Eggs ingested → larvae hatch in intestine → larvae migrate to lungs → larvae coughed up and swallowed → adults mature in intestine → eggs excreted in feces.

Question 5

Which of the following best explains how diarrhea and vomiting can benefit digestive pathogens?

Accepted Answer

They increase the spread of pathogens to new hosts by expelling them from the body.

Question 6

Which of the following statements about viral structure is correct?

Accepted Answer

Viruses consist of a nucleic acid genome, a protein capsid, and sometimes a lipid envelope.

Question 7

A virus with a helical capsid and a single-stranded RNA genome enters a host cell by membrane fusion. Which of the following is true about its entry mechanism?

Accepted Answer

The viral envelope fuses with the host cell membrane, releasing the capsid into the cytoplasm.

Question 8

Which of the following best describes the difference between a productive infection and a latent-state infection in animal viruses?

Accepted Answer

Productive infections result in the release of new virions, while latent infections involve integration of viral DNA without immediate production of new virions.

Question 9

Which of the following is a correct description of phage therapy?

Accepted Answer

The use of bacteriophages to treat bacterial infections, especially those resistant to antibiotics.

Question 10

Which of the following best describes the process of horizontal gene transfer during phage replication?

Accepted Answer

Phages accidentally package host bacterial DNA and transfer it to another bacterium during infection.

Question 11

A patient develops muscle weakness and neurological symptoms after eating undercooked pork. Which helminth is most likely responsible, and how does it attach in the body?

Accepted Answer

Tapeworm; attaches to the intestinal wall using its scolex.

Question 12

Which of the following best describes the symptoms and transmission of schistosomiasis?

Accepted Answer

Fever, rash, and liver damage; transmitted by contact with water containing larval forms released by snails.

Question 13

Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious proteins that cause neurodegenerative diseases such as Creutzfeldt-Jakob disease.

Question 14

Which of the following best explains why it is important to use a pure culture when observing an organism of interest in the laboratory?

Accepted Answer

A pure culture ensures that observed characteristics are due to a single species, avoiding confusion from mixed populations.

Question 15

Which of the following is a correct description of the three possible outcomes of viral infection in an animal cell?

Accepted Answer

Acute infection, chronic infection, and latent infection.

Question 16

Which of the following best describes the mechanism by which Necator americanus causes health problems in humans?

Accepted Answer

It is a nematode (hookworm) that penetrates the skin, migrates to the intestine, and causes anemia by feeding on blood.

Question 17

Which of the following is a correct statement about the size of viruses compared to bacteria and human cells?

Accepted Answer

Viruses are generally smaller than both bacteria and human cells, with sizes typically ranging from $$20\ \mathrm{nm} to$$ $$300\ \mathrm{nm}.$$

Question 18

Which of the following best describes how Dinophysis causes health problems in humans?

Accepted Answer

It is a dinoflagellate (alga) that produces toxins leading to diarrhetic shellfish poisoning when contaminated shellfish are consumed.

Question 19

Which of the following best describes the process of obtaining a pure culture from a mixed dilution plate?

Accepted Answer

Select a single, well-isolated colony and transfer it to fresh media to grow a population derived from one cell.

Microbiology Unit Test 3 Study Guide – Step-by-Step Guidance

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