Question 1

Which of the following statements best explains why 'protists' are considered a 'grade' and not a 'clade' in biological classification?

Accepted Answer

Protists represent a morphological grade, including organisms more complex than prokaryotes, but do not include all descendants of a common ancestor.

Question 2

Which of the following is a shared ancestral character (symplesiomorphy) of Eukarya?

Accepted Answer

Unicellularity

Question 3

A scientist discovers a single-celled organism with a nucleus, mitochondria, and the ability to photosynthesize. Which major eukaryotic lineage is this organism most likely to belong to?

Accepted Answer

Archaeplastida

Question 4

Which group of protists is most associated with causing neurotoxic shellfish poisoning, known as 'Red Tide'?

Accepted Answer

Dinoflagellates

Question 5

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

Accepted Answer

They are producers, responsible for about 25% of Earth's photosynthesis.

Question 6

Which of the following protist groups is characterized by 'hairy flagella' and includes diatoms, brown algae, and oomycetes?

Accepted Answer

Stramenopiles

Question 7

A patient presents with symptoms of African Sleeping Sickness. Which protist group is responsible for this disease, and what is the vector?

Accepted Answer

Kinetoplastids; tsetse fly

Question 8

Which of the following is true about the evolution of multicellularity in eukaryotes?

Accepted Answer

Multicellularity evolved independently in several eukaryotic lineages.

Question 9

Which of the following protist groups is most likely to have a shell made of calcium carbonate and is commonly found as plankton?

Accepted Answer

Foraminiferans

Question 10

Which of the following statements about protist pathogens is correct?

Accepted Answer

Protist infections are difficult to treat because they have cellular machinery similar to ours.

Question 11

Which of the following best describes the function of pseudopodia in Rhizarians?

Accepted Answer

Locomotion and prey capture

Question 12

Which of the following is a defining feature of alveolates?

Accepted Answer

Shared presence of alveoli beneath the cell membrane

Question 13

Which protist group includes organisms that are mostly free-living mixotrophs, such as Euglena?

Accepted Answer

Euglenozoans

Question 14

Which of the following is NOT a major clade of eukaryotes?

Accepted Answer

Prokaryota

Question 15

Which of the following equations best represents the process of photosynthesis performed by protists?

Accepted Answer

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

Question 16

Which of the following statements about the evolutionary trends in eukaryotes is correct?

Accepted Answer

Traits such as secondary endosymbiosis and parasitism have arisen multiple times independently.

Question 17

Which of the following protist groups is most likely to be found as a symbiont in the gut of termites, helping to break down cellulose?

Accepted Answer

Parabasalids

Question 18

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

Accepted Answer

Neurotoxic shellfish poisoning

Question 19

Which of the following best describes the life cycle of Plasmodium, the protist that causes malaria?

Accepted Answer

It has a complex life cycle involving both mosquitoes and humans.

Question 20

Which of the following is true about the group Unikonta?

Accepted Answer

It includes amoebas, fungi, and animals.

Protists: Diversity, Evolution, and Biological Roles

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