Question 1

Which of the following best describes the primary ecological role of mycorrhizal fungi in forest ecosystems?

Accepted Answer

They form symbiotic relationships with plant roots, enhancing water and nutrient absorption.

Question 2

Which structural component is present in fungal cell walls but absent in bacterial cell walls?

Accepted Answer

Chitin

Question 3

A patient presents with chronic diarrhea and keratoconjunctivitis. Which fungal phylum is most likely responsible, and what is a unique feature of this group?

Accepted Answer

Microsporidia; they lack mitochondria and are obligate intracellular parasites

Question 4

Which of the following best explains why fungi can thrive in environments with high sugar and salt concentrations?

Accepted Answer

They are resistant to osmotic pressure.

Question 5

A laboratory technician observes a fungus with septate hyphae and both sexual and asexual spores. Which phylum does this fungus most likely belong to?

Accepted Answer

Ascomycota

Question 6

Which of the following is a correct statement about fungal dimorphism?

Accepted Answer

Dimorphic fungi grow as yeasts at $$37^{\circ}C$ and as molds at 25$$^{\circ}$$C.$$

Question 7

A patient develops a chronic, ulcerative skin lesion after being pricked by a rose thorn. Which fungal disease is most likely, and what is the causative organism?

Accepted Answer

Subcutaneous mycosis; Sporothrix schenckii

Question 8

Which of the following best describes the difference between cutaneous and subcutaneous mycoses?

Accepted Answer

Cutaneous mycoses are limited to keratinized tissues, while subcutaneous mycoses involve deeper skin layers and sometimes lymphatics.

Question 9

Which mycotoxin is produced by Aspergillus flavus and is a significant contaminant of corn and peanuts?

Accepted Answer

Aflatoxin

Question 10

Which of the following is a beneficial use of fungi in industry?

Accepted Answer

Production of statins by Aspergillus terreus

Question 11

Which of the following statements about algae is correct?

Accepted Answer

Algae are eukaryotic, perform oxygenic photosynthesis, and can be unicellular or multicellular.

Question 12

A person develops numbness and muscle weakness after eating shellfish during a red tide event. Which organism and toxin are most likely responsible?

Accepted Answer

Dinoflagellate; saxitoxin

Question 13

Which of the following best describes the nutritional mode of most algae?

Accepted Answer

Photoautotrophic

Question 14

Which of the following is a correct pairing of protozoan group and its mode of movement?

Accepted Answer

Ciliates – cilia

Question 15

A patient is diagnosed with malaria. Which stage of Plasmodium infects red blood cells, and what is the process called when multiple daughter cells are produced?

Accepted Answer

Merozoite; schizogony

Question 16

Which protozoan is transmitted by the bite of a blood-feeding insect and causes African trypanosomiasis?

Accepted Answer

Trypanosoma spp.

Question 17

Which of the following is a distinguishing feature of platyhelminths (flatworms) compared to nematodes (roundworms)?

Accepted Answer

Platyhelminths are flat and may lack a digestive system, while nematodes are cylindrical with a complete digestive system.

Question 18

A child presents with perianal itching and is diagnosed with a pinworm infection. Which nematode is responsible, and what is the mode of transmission?

Accepted Answer

Enterobius vermicularis; ingestion of infective eggs

Question 19

Which of the following best describes biological transmission by arthropod vectors?

Accepted Answer

The pathogen multiplies within the vector before transmission to a new host.

Question 20

In the life cycle of Echinococcus granulosus, which statement is correct regarding the roles of hosts?

Accepted Answer

Dogs are the definitive host, and humans are intermediate hosts harboring larval forms.

Fungi, Algae, Protozoa, and Helminths: Microbiology Study Guide

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