AP Biology : Understand endosymbiotic theory
Study concepts, example questions & explanations for AP Biology
All AP Biology Resources
Example Questions
Example Question #1 : Understand Endosymbiotic Theory
Mitochondria and chloroplasts have their own DNA, which is similar to the DNA of
protozoa
humans
fungi
bacteria
bacteria
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).
Example Question #1 : Understand Endosymbiotic Theory
Reproduction of chloroplasts and mitochondria occurs via
Mitosis
Meiosis
Fission-like process, similar to the reproduction process of bacteria
Fission-like process, similar to the reproduction process of eukaryotes
Fission-like process, similar to the reproduction process of bacteria
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.
Example Question #1 : Understand Endosymbiotic Theory
Supporting the Endosymbiotic Theory, mitochondria and chloroplasts have a _________ membrane.
thick
thin
single
double
double
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).
Example Question #2 : Understand Endosymbiotic Theory
Mitochondria and chloroplasts have ribosomes that are ___, similar to __ cells.
80S, prokaryotic
70S, eukaryotic
80S, eukaryotic
70 S, prokaryotic
70 S, prokaryotic
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).
Example Question #2 : Understand Endosymbiotic Theory
The Endosymbiotic Theory posits that, before being engulfed by a eukaryotic cell, they were
Free-living eukaryotes
Organelles
Free-living prokaryotes
Viruses
Free-living prokaryotes
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). The aerobic bacteria were initially free-living prokaryotes, before being ingested by anaerobic bacteria.
Example Question #2 : Understand Endosymbiotic Theory
Which of the following is NOT evidence for the Endosymbiotic Theory?
Mitochondria and chloroplasts have 70S ribosomes
Mitochondria and chloroplasts have circular DNA
Mitochondria and chloroplasts have a double membrane
Mitochondria and chloroplasts have a single membrane
Mitochondria and chloroplasts have a single membrane
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).
Certified Tutor
Certified Tutor
All AP Biology Resources
