Question 1

Which of the following best describes the main distinguishing feature of the subgroup Diplomonads within the Excavata supergroup?

Accepted Answer

They have two nuclei, mitosomes, and multiple flagella.

Question 2

A patient is diagnosed with a parasitic infection caused by Giardia lamblia. Based on its classification, which of the following cellular features would you expect to find in this organism?

Accepted Answer

Two nuclei, mitosomes, and multiple flagella

Question 3

Which subgroup is characterized by a spiral or crystalline rod inside their flagella and includes the parasite Trypanosoma, which causes sleeping sickness?

Accepted Answer

Kinetoplastids

Question 4

A biologist is studying a protist with a hairy and a smooth flagellum. To which supergroup and subgroup does this organism most likely belong?

Accepted Answer

SAR supergroup, Stramenopiles

Question 5

Which of the following is a defining feature of Alveolates, and which subgroup includes the organism Paramecium?

Accepted Answer

Presence of alveoli under the membrane; Ciliates

Question 6

A marine biologist finds a protist with a calcium carbonate shell and threadlike pseudopods. Which subgroup does this organism most likely belong to?

Accepted Answer

Foraminiferans

Question 7

Which of the following best explains the evolutionary origin of Archaeplastida, including red and green algae?

Accepted Answer

They descended from cyanobacterial endosymbiosis.

Question 8

Which pigment is primarily responsible for the red coloration in red algae, and what is its function?

Accepted Answer

Phycoerythrin; absorbs blue and green light for photosynthesis

Question 9

Which of the following statements about Chlorophytes is correct?

Accepted Answer

They are a subgroup of green algae and can be unicellular, multicellular, or colonial.

Question 10

A scientist observes a protist with lobe-shaped pseudopodia. Which supergroup and subgroup does this organism most likely belong to?

Accepted Answer

Unikonta supergroup, Amoebozoans

Question 11

Which of the following is a key difference between the Opisthokonts and the Amoebozoans within the Unikonta supergroup?

Accepted Answer

Opisthokonts have a single posterior flagellum, while Amoebozoans have lobe-shaped pseudopodia.

Question 12

Which subgroup includes organisms that are important for the formation of marine sediments due to their silica skeletons?

Accepted Answer

Radiolarians

Question 13

A protist is observed to have a pellicle, a prominent nucleus, and moves using cilia. Which subgroup does it most likely belong to?

Accepted Answer

Ciliates

Question 14

Which of the following best describes the alternation of generations observed in brown algae?

Accepted Answer

A life cycle that alternates between multicellular haploid and diploid stages

Question 15

Which subgroup is characterized by the presence of alveoli under the membrane and includes both photosynthetic and parasitic members?

Accepted Answer

Alveolates

Question 16

A researcher is studying a fungus and an animal cell. Both are classified as Opisthokonts. Which of the following features do they share that supports this classification?

Accepted Answer

A single posterior flagellum at some stage of their life cycle

Question 17

Which of the following equations best represents the alternation of generations in brown algae, where $$n is $$the haploid stage and $$2n is $$the diploid stage?

Accepted Answer

$$n \rightarrow 2n \rightarrow n$$

Question 18

Which subgroup includes organisms that are parasitic, such as Entamoeba histolytica, and are characterized by lobe-shaped pseudopodia?

Accepted Answer

Amoebozoans

Question 19

Which of the following best explains why Euglenids are considered mixotrophic?

Accepted Answer

They can obtain energy both by photosynthesis and by ingesting food particles.

Question 20

A protist is found to have a single large mitochondrion with an organized mass of DNA called a kinetoplast. Which subgroup does it belong to?

Accepted Answer

Kinetoplastids

Overview of Eukaryotic Diversity: Protists, Algae, and Related Groups

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