Question 1

Which of the following best describes the endosymbiotic theory as it relates to protists?

Accepted Answer

A eukaryotic cell engulfed photosynthetic bacteria, leading to the development of chloroplasts and the ability to photosynthesize.

Question 2

Which equation correctly represents the process of photosynthesis carried out by many protists?

Accepted Answer

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

Question 3

A scientist observes a protist that can both photosynthesize and ingest food particles. Which term best describes its nutritional strategy?

Accepted Answer

Mixotroph

Question 4

Why are protists considered essential to marine ecosystems?

Accepted Answer

They act as producers, forming the base of aquatic food webs and contributing to global carbon cycles.

Question 5

Which of the following is a real-world consequence of coral bleaching related to protist symbiosis?

Accepted Answer

Corals expel photosynthetic algae, losing their main source of nutrients and leading to reef death.

Question 6

Which protist group is most closely associated with forming large colonies that resemble multicellular organisms, such as kelp?

Accepted Answer

Stramenopiles (e.g., brown algae)

Question 7

A protist is observed moving using a whip-like structure along the side of its cell. What is this structure called?

Accepted Answer

Flagellum

Question 8

Which of the following best explains how protists contribute to the oxygen content of Earth's atmosphere?

Accepted Answer

Protists release oxygen as a byproduct of photosynthesis.

Question 9

Which of the following is a plausible effect on marine food webs if protist populations drastically decline?

Accepted Answer

Collapse of food webs due to loss of primary producers.

Question 10

Which process allows protists to remove carbon dioxide from the environment and introduce oxygen?

Accepted Answer

Photosynthesis

Question 11

A protist living inside another cell and performing a specialized function is an example of which biological relationship?

Accepted Answer

Endosymbiosis

Question 12

Which of the following is NOT a typical role of protists in aquatic environments?

Accepted Answer

Top predator

Question 13

Which protist is most likely to be found in a mutualistic relationship with coral, providing nutrients through photosynthesis?

Accepted Answer

Dinoflagellate

Question 14

Which of the following best describes the diversity of protists?

Accepted Answer

Protists include both unicellular and multicellular forms, some living in colonies resembling multicellular organisms.

Question 15

Which equation represents the removal of carbon dioxide and production of oxygen by protists?

Accepted Answer

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

Question 16

Which of the following is a key feature distinguishing protists from bacteria?

Accepted Answer

Protists have membrane-bound organelles, such as chloroplasts and nuclei.

Question 17

Which protist group includes organisms that can protect coastlines and serve as biodiversity hotspots?

Accepted Answer

Brown algae (Stramenopiles)

Question 18

Which of the following statements about protist reproduction is correct?

Accepted Answer

Some protists reproduce sexually, while others reproduce asexually.

Question 19

A protist is observed to have chloroplasts and can make its own food. What is its likely nutritional classification?

Accepted Answer

Photoautotroph

Question 20

Which of the following is a direct benefit of protists to human health?

Accepted Answer

Some protists are used as food supplements due to their high nutrient content.

Protists: Diversity, Structure, and Ecological Roles

Study Guide - Practice Questions