Question 1

Which process is primarily responsible for the origin of mitochondria and plastids in eukaryotic cells?

Accepted Answer

Endosymbiosis

Question 2

According to the serial endosymbiosis hypothesis, which organelle evolved first in eukaryotes?

Accepted Answer

Mitochondrion

Question 3

Which supergroup of eukaryotes includes animals, fungi, and amoebas with lobe- or tube-shaped pseudopodia?

Accepted Answer

Unikonta

Question 4

A scientist discovers a unicellular organism with a nucleus, mitochondria, and a cytoskeleton. Which domain does this organism belong to?

Accepted Answer

Eukarya

Question 5

Which of the following is evidence supporting the endosymbiotic origin of mitochondria?

Accepted Answer

Mitochondria replicate by a splitting process similar to bacteria

Question 6

Red algae and green algae plastids have two membranes. What does this indicate about their evolutionary origin?

Accepted Answer

They evolved from a single endosymbiotic event involving a cyanobacterium

Question 7

Which group of protists is responsible for causing malaria in humans?

Accepted Answer

Plasmodium

Question 8

During a diatom bloom, what happens to carbon in the ecosystem?

Accepted Answer

Carbon is trapped in undecomposed diatoms on the ocean floor

Question 9

Which of the following is a plausible explanation for the decline in marine photosynthetic protists due to climate change?

Accepted Answer

Disruption of nutrient upwelling

Question 10

Which eukaryotic supergroup includes the most important photosynthetic organisms on Earth, such as diatoms and brown algae?

Accepted Answer

SAR

Question 11

A protist is found to have a single mitochondrion with an organized mass of DNA called a kinetoplast. To which clade does it most likely belong?

Accepted Answer

Kinetoplastids

Question 12

Which of the following features is NOT derived from bacteria in eukaryotes, according to Table 25.1?

Accepted Answer

DNA replication enzymes

Question 13

Which evolutionary event is most closely associated with the rise of large multicellular eukaryotes in the Ediacaran period?

Accepted Answer

Complex multicellularity

Question 14

Which of the following is a real-world example of symbiotic protists benefiting their host?

Accepted Answer

Dinoflagellates providing food for coral polyps

Question 15

Which equation 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 multicellularity in Volvox is supported by genetic evidence?

Accepted Answer

Multicellularity involved changes in the use of existing genes

Question 17

Which protist group is named for its 'excavated' feeding groove and includes parasites such as Giardia intestinalis?

Accepted Answer

Excavata

Question 18

Which of the following is a plausible consequence of seeding the ocean with iron to promote diatom blooms?

Accepted Answer

Enhanced carbon sequestration on the ocean floor

Question 19

Which of the following is a distinguishing feature of ciliates?

Accepted Answer

Use of cilia to move and feed

Question 20

Which of the following best describes the evolutionary relationship between choanoflagellates and animals?

Accepted Answer

Choanoflagellates are the closest living relatives of animals

The Origin and Diversification of Eukaryotes

Guida di studio - Domande di pratica