What are some questions scientists still have about endosymbiosis?

Mitochondria and chloroplasts have their own DNA, which is similar to the DNA of

Possible Answers:

Explanation:

Bacteria, a prokaryote, has circular DNA, as do mitochondria and chloroplasts. This provides support for the Endosymbiotic Theory, which states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote).

Reproduction of chloroplasts and mitochondria occurs via

Possible Answers:

Fission-like process, similar to the reproduction process of eukaryotes

Fission-like process, similar to the reproduction process of bacteria

Correct answer:

Fission-like process, similar to the reproduction process of bacteria

Explanation:

Chloroplasts and mitochondria reproduce through fission, the same process through which bacteria reproduce. Eukaryotes reproduce through mitosis or meiosis, depending upon the type of cell.

Supporting the Endosymbiotic Theory, mitochondria and chloroplasts have a _________ membrane.

Possible Answers:

Explanation:

The Endosymbiotic Theory states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote). Mitochondria and chloroplasts have a double membrane (the inner membrane would have initially been the ingested prokaryote’s single membrane).

Mitochondria and chloroplasts have ribosomes that are ___, similar to __ cells.

Possible Answers:

Correct answer:

70 S, prokaryotic

Explanation:

Prokaryotic cells, mitochondria, and chloroplasts have 70S ribosomes, whereas eukaryotic cells have 80S ribosomes. This provides support for the Endosymbiotic Theory, which states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote).

The Endosymbiotic Theory posits that, before being engulfed by a eukaryotic cell, they were

Possible Answers:

Correct answer:

Free-living prokaryotes

Explanation:

Which of the following is NOT evidence for the Endosymbiotic Theory?

Possible Answers:

Mitochondria and chloroplasts have 70S ribosomes

Mitochondria and chloroplasts have a double membrane

Mitochondria and chloroplasts have circular DNA

Mitochondria and chloroplasts have a single membrane

Correct answer:

Mitochondria and chloroplasts have a single membrane

Explanation:

The Endosymbiotic Theory states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote). This theory explains the origin of eukaryotic cells. Numerous lines of evidence exist, including that mitochondria and chloroplasts have their own circular DNA (prokaryotes also have circular DNA), mitochondria and chloroplasts have a double membrane (the inner membrane would have initially been the ingested prokaryote’s single membrane, and the outer membrane initially would have come from the cell that engulfed it), mitochondria and chloroplasts have 70S ribosomes (prokaryotes 70S have ribosomes, whereas eukaryotes have 80S ribosomes).

Justine
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University of Guelph, Bachelor of Science, Marine Biology. Wilfrid Laurier University, Master of Science, Marine Biology.

Orest
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Fordham University, Bachelor in Arts, Political Science and Government.

Jacob
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George Mason University, Bachelor of Science, Biotechnology.

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