Question 1

Which of the following statements best distinguishes fungi from plants?

Accepted Answer

Fungi lack chlorophyll and do not perform photosynthesis, while plants contain chlorophyll and are photosynthetic.

Question 2

A patient presents with symptoms of liver damage after consuming contaminated grains. Which fungal toxin is most likely responsible?

Accepted Answer

Aflatoxin

Question 3

Which of the following best describes the difference between septate and coenocytic hyphae in molds?

Accepted Answer

Septate hyphae have cross walls dividing them into cell-like units, while coenocytic hyphae lack cross walls and are multinucleate.

Question 4

A laboratory culture of a dimorphic fungus is incubated at 25ºC and 37ºC. What morphological forms would you expect to observe at each temperature?

Accepted Answer

At 25ºC: mold; at 37ºC: yeast

Question 5

Which of the following is a correct description of a conidiospore (conidium)?

Accepted Answer

A spore produced at the tips or sides of hyphae, not enclosed by a sac

Question 6

Which group of fungi is primarily responsible for food spoilage and includes the genus that produces penicillin?

Accepted Answer

Ascomycota

Question 7

A marine biologist is investigating a massive fish kill and suspects a toxic algal bloom. Which organism is most likely responsible, and what environmental factor could have contributed?

Accepted Answer

Pfiesteria piscicida; agricultural runoff

Question 8

Which of the following best explains why classification of algae is problematic?

Accepted Answer

Algae differ greatly in distribution, morphology, reproduction, and biochemical preferences.

Question 9

Which of the following statements about protozoan reproduction is correct?

Accepted Answer

Most protozoans reproduce asexually, often by schizogony, but some can reproduce sexually by conjugation.

Question 10

A patient is diagnosed with amoebic dysentery. Which protozoan is the causative agent, and what is a key feature of its life cycle that aids in transmission?

Accepted Answer

Entamoeba histolytica; formation of cysts that can survive in the environment

Question 11

Which of the following protozoan groups is characterized by the absence of mitochondria and includes human parasites such as Giardia lamblia?

Accepted Answer

Archaezoa

Question 12

A researcher observes a protozoan with an eyespot that moves toward light and can ingest organic matter. To which group does this organism most likely belong?

Accepted Answer

Euglenozoa

Question 13

Which of the following best describes the difference between cellular and plasmodial slime molds?

Accepted Answer

Cellular slime molds spend most of their lives as single amoeboid cells and aggregate under stress, while plasmodial slime molds form a large multinucleate mass.

Question 14

A patient is diagnosed with malaria. Which protozoan group is responsible, and what is a key feature of its life cycle?

Accepted Answer

Apicomplexa; complex life cycle requiring multiple hosts

Question 15

Which of the following statements about helminth life cycles is correct?

Accepted Answer

The adult stage and mating generally occur in the definite (final) host, while larval development usually occurs in intermediate hosts.

Question 16

A child presents with perianal itching and is diagnosed with a pinworm infection. Which helminth is responsible, and how is it typically transmitted?

Accepted Answer

Enterobius vermicularis; eggs transmitted by fomites

Question 17

Which of the following best describes the main difference between trematodes and cestodes?

Accepted Answer

Trematodes are flatworms named for their host tissue, while cestodes are intestinal flatworm parasites known as tapeworms.

Question 18

Which of the following algae is used as a source of agar and contains a red accessory pigment?

Accepted Answer

Rhodophyta

Question 19

A sample of plankton is found to contain unicellular organisms with cell walls made of silica. To which group do these organisms belong?

Accepted Answer

Chrysophyta (diatoms)

Question 20

Which of the following best explains why fungal sexual reproduction is important in nature?

Accepted Answer

It introduces genetic variation, which is beneficial during changing or unfavorable environmental conditions.

Eukaryotic Microorganisms: Fungi, Algae, Protozoans, Slime Molds, and Helminths

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