Question 1

Which of the following is a key feature that distinguishes eukaryotic cells from prokaryotic cells?

Accepted Answer

DNA wrapped around histone proteins within a nuclear membrane

Question 2

According to the endosymbiont theory, which evidence supports the idea that mitochondria originated from free-living bacteria?

Accepted Answer

Mitochondria have their own circular DNA and ribosomes

Question 3

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

Accepted Answer

Protists display a wide variety of nutritional modes, including photosynthesis, ingestion, and absorption

Question 4

A protist moves by extending its cytoplasm into a pseudopod. Which organism is most likely being described?

Accepted Answer

Amoeba

Question 5

Which process is NOT a typical method of reproduction among protists?

Accepted Answer

Spore formation exclusively in multicellular plants

Question 6

Protists play a crucial role as primary producers in aquatic ecosystems. What is the main reason for their importance?

Accepted Answer

They produce oxygen and serve as the base of the food web for larger organisms

Question 7

Which of the following diseases is caused by a protist that infects human red blood cells?

Accepted Answer

Malaria

Question 8

A scientist observes a protist that moves using a flagellum. Which of the following is most likely the organism being observed?

Accepted Answer

Euglena

Question 9

Which statement best explains why protists are considered essential nutrient recyclers in ecosystems?

Accepted Answer

Protists break down dead organisms and return nutrients to the soil, supporting plant life

Question 10

Which of the following is a direct consequence of the endosymbiotic origin of chloroplasts?

Accepted Answer

Chloroplasts contain their own circular DNA and ribosomes

Question 11

Protists exhibit a variety of lifecycles. Which lifecycle is most likely to occur in response to environmental stress?

Accepted Answer

Sexual reproduction

Question 12

Which of the following statements about protist phylogeny is correct?

Accepted Answer

Protist traits are due to convergent evolution and are separated based on cellular characteristics

Question 13

A protist is observed to cause red, wilted leaves and decay in plants. Which type of protist is most likely responsible?

Accepted Answer

Parasitic protist

Question 14

Which of the following is NOT a function of protists in the environment?

Accepted Answer

Fixing atmospheric nitrogen

Question 15

Which of the following best describes the genetic material found in mitochondria and chloroplasts?

Accepted Answer

Circular DNA similar to bacterial chromosomes

Question 16

A protist is observed to reproduce by budding. Which of the following statements is true about this process?

Accepted Answer

Budding produces a new organism from a small outgrowth of the parent

Question 17

Which of the following protists is known to change its extracellular glycoproteins to evade the host immune system, causing sleeping sickness?

Accepted Answer

Trypanosoma

Question 18

Which of the following is a real-world example of a protist providing an ecosystem service?

Accepted Answer

Dinoflagellates forming symbiotic relationships with coral, contributing to reef health

Question 19

Which of the following is true regarding the reproduction of mitochondria and chloroplasts within eukaryotic cells?

Accepted Answer

They replicate independently using their own DNA and ribosomes

Question 20

A protist is found to infect the liver and gastrointestinal tract of amphibians, causing mass mortality events. Which pathogen is most likely responsible?

Accepted Answer

Perkinsea

Microbial Life: Protists – Structure, Function, and Diversity

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