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10 Jan 2019

Which of the following is an example of endosymbiosis?

A

a eukaryotic cell was ingested by a prokaryote and eventually became an organelle.

B

a white blood cell engulfs a microbe.

C

a prokaryotic cell was ingested by a eukaryote and eventually became an organelle.

D

a structured community of bacterial cells on a surface.

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Deanna HettingerLv2

10 Jan 2019

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The endosymbiont theory suggests that mitochondria and chloroplasts evolved from ancient bacteria that were ingested by primitive nucleated cells. Biologists have proposed that endosymbiosis led to the evolution of other cellular structures, such as flagella and peroxisomes, as well. Over hundreds of millions of years, the ingested bacteria lost features not essential for survival inside the host cell.

Part B

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Drag the terms on the left to the appropriate blanks on the right to complete the sentences.

phagocytosis

pinocytosis

phagocytic

pinocytic

invaginations

protrusions

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Part E

Peroxisomes, unlike mitochondria or chloroplasts, scarcely resemble free-living organisms. Assuming peroxisomes evolved from ingested bacteria, describe three features mitochondria retain but peroxisomes apparently lost over hundreds of millions of years.

Select all that apply.