Question 1

Which of the following statements best describes the relationship between endosymbiosis and the origin of mitochondria in eukaryotic cells?

Accepted Answer

Mitochondria originated from an ancestral archaeal host cell that engulfed an alpha-proteobacterium, which then became the mitochondrion.

Question 2

Which of the following is a key structural feature that distinguishes Stramenopiles from other protists?

Accepted Answer

Presence of a hairy flagellum paired with a smooth flagellum.

Question 3

Diatoms play a significant role in the global carbon cycle. Which process do they perform that impacts atmospheric carbon dioxide levels?

Accepted Answer

Carbon fixation, removing $$CO_2$$ from the atmosphere and transferring it to the ocean floor

Question 4

Which of the following best explains why oomycetes were once classified as fungi but are now placed with Stramenopiles?

Accepted Answer

Oomycetes have multinucleate filaments but their cell walls are made of cellulose, not chitin.

Question 5

A scientist discovers a unicellular organism with two flagella, one hairy and one smooth, and a glass-like cell wall made of silicon dioxide. To which group does this organism most likely belong?

Accepted Answer

Diatoms

Question 6

Which of the following is a real-world consequence of dinoflagellate blooms in marine environments?

Accepted Answer

Formation of toxic 'red tides' that can kill marine life

Question 7

Which of the following best describes the nutritional diversity found among protists?

Accepted Answer

Protists include photoautotrophs, heterotrophs, and mixotrophs.

Question 8

Which of the following protists is responsible for causing malaria, and what is a key feature of its life cycle?

Accepted Answer

Plasmodium; it requires two or more different host species to complete its life cycle.

Question 9

Which of the following statements about the evolutionary relationship between green algae and land plants is correct?

Accepted Answer

Land plants are descended from green algae, specifically the charophytes.

Question 10

Which of the following is a distinguishing feature of ciliates such as Paramecium?

Accepted Answer

They have two types of nuclei: macronucleus and micronucleus.

Question 11

A researcher is studying a protist that can switch between photosynthesis in sunlight and heterotrophy in the dark. Which group does this organism most likely belong to?

Accepted Answer

Euglenids

Question 12

Which of the following best describes the ecological role of photosynthetic protists in aquatic environments?

Accepted Answer

They are the main producers, forming the base of the food web.

Question 13

Which of the following is a correct sequence of taxonomic ranks from broadest to most specific?

Accepted Answer

Domain, Supergroup, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 14

Which of the following protist groups is characterized by thread-like pseudopodia and silica-based skeletons?

Accepted Answer

Radiolarians

Question 15

Which of the following is a practical use of red algae in human society?

Accepted Answer

Source of agar used in culture media and food products

Question 16

Which of the following best explains why the SAR clade is considered monophyletic?

Accepted Answer

It is defined by DNA similarities among Stramenopiles, Alveolates, and Rhizarians.

Question 17

Which of the following protists is most closely related to animals?

Accepted Answer

Choanoflagellates

Question 18

Which of the following is a key difference between primary and secondary endosymbiosis in the evolution of plastids?

Accepted Answer

Primary endosymbiosis involves engulfment of a cyanobacterium by a eukaryote, while secondary endosymbiosis involves engulfment of a plastid-containing eukaryote by another eukaryote.

Question 19

Which of the following protists is responsible for African sleeping sickness, and what adaptation allows it to evade the host immune system?

Accepted Answer

Trypanosoma; it switches its surface proteins from generation to generation.

Question 20

Which of the following best describes the impact of rising sea surface temperatures on photosynthetic protists and marine ecosystems?

Accepted Answer

It decreases the biomass of photosynthetic protists, potentially disrupting marine food webs and the global carbon cycle.

Protists: Diversity, Classification, and Ecological Roles

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