Question 1

Which of the following statements best describes the current use of the term 'protist' in biology?

Accepted Answer

Protists are eukaryotes that are neither plants, animals, nor fungi.

Question 2

Which scientist is credited as the 'father of microbiology' for his pioneering work with single-lens microscopes and observations of single-celled organisms?

Accepted Answer

Antonie van Leeuwenhoek

Question 3

Why do protists exhibit more structural and functional diversity than any other group of eukaryotes?

Accepted Answer

They include a wide range of nutritional modes and cellular structures.

Question 4

Which of the following best explains why the evolutionary relationships among protists remain unclear?

Accepted Answer

Protists are a highly diverse group with multiple evolutionary origins.

Question 5

A scientist observes a unicellular organism with a nucleus, mitochondria, and chloroplasts. Which nutritional mode could this organism potentially exhibit?

Accepted Answer

Mixotrophy

Question 6

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

Accepted Answer

Presence of a spiral or crystalline rod inside their flagella

Question 7

The endosymbiotic theory explains the origin of which two organelles in eukaryotic cells?

Accepted Answer

Mitochondria and plastids

Question 8

Which of the following best describes the process of secondary endosymbiosis?

Accepted Answer

A eukaryote engulfs another eukaryote that already contains a plastid.

Question 9

A patient is diagnosed with 'Beaver Fever' after drinking contaminated water. Which protist is responsible for this disease, and what is a key feature of its cellular structure?

Accepted Answer

Giardia; has two equal-sized nuclei and multiple flagella

Question 10

Which of the following statements about diatoms is correct?

Accepted Answer

Diatoms are a major component of phytoplankton and have silica cell walls.

Question 11

The 'biological carbon pump' involving diatoms is important for which of the following reasons?

Accepted Answer

It sequesters $$CO_2 in $$ocean sediments for long periods.

Question 12

Which of the following is a potential ecological risk of large-scale iron fertilization in the ocean to promote phytoplankton growth?

Accepted Answer

Development of anoxic (dead) zones in deep ocean areas

Question 13

Dinoflagellate blooms, also known as 'red tides,' can have which of the following impacts on marine ecosystems?

Accepted Answer

Production of toxins that can accumulate in shellfish and cause human illness

Question 14

Which of the following best explains why developing a vaccine for malaria is challenging?

Accepted Answer

The parasite has a complex life cycle, high genetic variability, and often resides within host cells.

Question 15

Which of the following is a unique feature of ciliates that contributes to their genetic diversity?

Accepted Answer

They exchange genetic material through conjugation involving micronuclei.

Question 16

A marine protist with a porous, chambered shell made of calcium carbonate and pseudopodia extending through the pores is most likely a:

Accepted Answer

Foraminiferan

Question 17

Red algae are able to live at greater ocean depths than green algae primarily because:

Accepted Answer

They possess the pigment phycoerythrin, which absorbs blue and green light.

Question 18

Which of the following evolutionary events is supported by the presence of a nucleomorph in chlorarachniophytes?

Accepted Answer

Secondary endosymbiosis involving a green alga

Question 19

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

Accepted Answer

Protists can be photoautotrophs, heterotrophs, or mixotrophs.

Question 20

A protist is observed to have a single mitochondrion with a large mass of DNA called a kinetoplast. This organism is most likely a member of which group, and what disease can it cause?

Accepted Answer

Kinetoplastids; causes sleeping sickness

Protists: Origins, Diversity, and Ecology

Guida di studio - Domande di pratica

Study guide - Flashcard