Question 1

Which of the following best explains the theory of endosymbiosis as it relates to the origin of mitochondria in eukaryotic cells?

Accepted Answer

Mitochondria originated as symbiotic, aerobic eubacteria that were engulfed by ancestral eukaryotic cells.

Question 2

Which of the following characteristics is NOT typically used to classify protists into groups?

Accepted Answer

Ability to form seeds

Question 3

A patient presents with symptoms of malaria after traveling to a tropical region. Which group of protists is responsible for this disease, and what is a key feature of their life cycle?

Accepted Answer

Sporozoans (Apicomplexa); they have complex life cycles involving both sexual and asexual phases

Question 4

Which of the following best describes the nutritional strategy of fungi?

Accepted Answer

Fungi are heterotrophs that absorb nutrients after secreting digestive enzymes into their environment.

Question 5

Which of the following is a mutualistic relationship involving fungi, and what is its ecological significance?

Accepted Answer

Mycorrhizae; it enhances nutrient and water uptake for plants

Question 6

Which structure is responsible for the reproductive function in Basidiomycota (club fungi)?

Accepted Answer

Basidium

Question 7

A scientist observes a unicellular organism with two flagella, chloroplasts, and a stigma. Which group does this organism most likely belong to?

Accepted Answer

Euglenoids

Question 8

Which of the following best describes the role of algae in aquatic ecosystems?

Accepted Answer

They are major photosynthesizers, producing food and oxygen for the ecosystem.

Question 9

Which of the following statements about the cell wall of fungi is correct?

Accepted Answer

It is composed primarily of chitin.

Question 10

A person develops a respiratory illness after inhaling spores from a fungus growing on decaying wood. Which group of fungi is most likely responsible, and what is a common example of a disease caused by this group?

Accepted Answer

Deuteromycota (Imperfect Fungi); Aspergillosis

Question 11

Which of the following equations correctly represents the process of photosynthesis carried out by plant-like protists (algae)?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 12

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

Accepted Answer

Cellular slime molds aggregate into a multicellular slug during part of their life cycle, while plasmodial slime molds form a multinucleate plasmodium.

Question 13

Which of the following is a correct statement about the reproduction of yeast (a type of Ascomycota)?

Accepted Answer

Yeast reproduce asexually by budding.

Question 14

Which of the following is a real-world example of a disease caused by a flagellated protist, and how is it transmitted?

Accepted Answer

African Sleeping Sickness; transmitted by the tsetse fly

Question 15

Which of the following best explains why fungi are important decomposers in ecosystems?

Accepted Answer

They secrete enzymes that break down complex organic matter, recycling nutrients.

Question 16

Which of the following is a distinguishing feature of diatoms (Chrysophyta)?

Accepted Answer

They have double shells made of opaline silica.

Question 17

A bread sample is contaminated with ergot fungus. Which phylum does this fungus belong to, and what is a potential effect of consuming contaminated bread?

Accepted Answer

Ascomycota; can cause ergotism (poisoning)

Question 18

Which of the following best describes the function of the fruiting body in fungi?

Accepted Answer

It is the reproductive structure that produces spores.

Question 19

Which of the following is a correct description of the mutualistic relationship in lichens?

Accepted Answer

The fungus provides structure and water retention, while the algae photosynthesize to provide food.

Question 20

Which of the following is a correct equation for aerobic cellular respiration, a process used by many heterotrophic protists and fungi?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$$

Protists and Fungi: Diversity, Structure, and Importance

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