Question 1

Which of the following statements best explains why fungi are considered chemoheterotrophs?

Accepted Answer

They obtain both energy and carbon by absorbing organic molecules from their environment.

Question 2

A laboratory technician observes a fungal sample that grows as yeast at 37°C and as mold at 25°C. What is the term for this phenomenon?

Accepted Answer

Dimorphism

Question 3

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

Accepted Answer

Septate hyphae have cross-walls dividing the hyphae into distinct cells, while coenocytic hyphae lack cross-walls and contain many nuclei.

Question 4

Which of the following asexual fungal spores is formed by the fragmentation of septate hyphae?

Accepted Answer

Arthroconidium

Question 5

A patient presents with a systemic mycosis. Which of the following best describes this type of infection?

Accepted Answer

It is deep within the body and may affect multiple organs.

Question 6

Which of the following is a medically important economic use of fungi?

Accepted Answer

Production of taxol, an anti-cancer drug, from Taxomyces

Question 7

Which of the following best explains why algae are important to aquatic ecosystems?

Accepted Answer

They fix carbon dioxide and produce molecular oxygen, supporting aquatic food webs.

Question 8

A person develops paralytic shellfish poisoning after eating contaminated shellfish. Which group of organisms is most likely responsible?

Accepted Answer

Dinoflagellates

Question 9

Which of the following statements about protozoa is correct?

Accepted Answer

Protozoa may reproduce asexually by fission, budding, or schizogony.

Question 10

A patient is diagnosed with amebic dysentery caused by Entamoeba histolytica. Which mechanism does this protozoan use to cause cell lysis?

Accepted Answer

It uses a protein lectin that binds to galactose on the host cell membrane.

Question 11

Which of the following best describes the definitive host in the life cycle of Plasmodium (malaria)?

Accepted Answer

The mosquito, where sexual reproduction occurs

Question 12

Which of the following is a distinguishing feature of helminths compared to protozoa?

Accepted Answer

Helminths have tissues and organs, while protozoa are unicellular.

Question 13

A patient presents with symptoms of neurocysticercosis. Which organism is most likely responsible for this condition?

Accepted Answer

Taenia solium (pork tapeworm)

Question 14

Which of the following best describes the life cycle of a typical trematode (fluke)?

Accepted Answer

It involves at least two hosts, with a snail as the intermediate host and a vertebrate as the definitive host.

Question 15

Which of the following adaptations allows fungi to thrive in environments where bacteria cannot?

Accepted Answer

Ability to grow in high sugar and salt concentrations and low moisture environments

Question 16

Which of the following is true regarding the metabolism of fungi compared to bacteria?

Accepted Answer

Fungi are limited to heterotrophic metabolism, while bacteria can be heterotrophic, autotrophic, or chemolithotrophic.

Question 17

Which of the following best explains why diatoms can be used for species identification?

Accepted Answer

Their cell walls are composed of pectin and silica, forming unique shapes that fit together like a petri dish.

Question 18

A child presents with perianal itching and is diagnosed with Enterobius vermicularis infection. What is the most likely mode of transmission?

Accepted Answer

Accidental ingestion of eggs from contaminated clothing or bedding

Question 19

Which of the following statements about the reproduction of fungi is correct?

Accepted Answer

Fungi can reproduce both sexually and asexually by forming spores.

Question 20

Which of the following is a correct sequence of events in the sexual reproduction of fungi?

Accepted Answer

Plasmogamy → Karyogamy → Meiosis

Eukaryotic Microorganisms: Fungi, Algae, Protozoa, and Helminths

Study Guide - Practice Questions