. Why was the great oxygenation event important for mitochondrial development? a) In your own words, define symbiotic. 2. Chloroplasts and mitochondria both contain a circular DNA chromosome, and ribosomes. Why does this evidence support the theory of endosymbiosis as the mechanism for the origin of eukaryotic cells? a) Today, could mitochondria live independently of their eukaryotic cell host? Give two pieces of evidence to support your answer.

. Why was the great oxygenation event important for mitochondrial development? a) In your own words, define symbiotic. 2. Chloroplasts and mitochondria both contain a circular DNA chromosome, and ribosomes. Why does this evidence support the theory of endosymbiosis as the mechanism for the origin of eukaryotic cells? a) Today, could mitochondria live independently of their eukaryotic cell host? Give two pieces of evidence to support your answer.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter27: Protists

Section27.2: The Protist Groups

Problem 1SB: What is the evidence that the metamonads, which lack mitochondria, derive from ancestors that had...

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What role did the increase of atmospheric oxygen by prokaryotes play in the development of the endosymbiotic relationship between protoeukaryotes and mitochondria?
Under the endosymbiotic theory for the origin of the eukaryotic cell. The ancestor of mitochondria and chloroplasts original became part of mutualism with a larger host cell. Which of the following best explains this mutualism? A) The mitochondria and chloroplasts provided specialized reproduction as part of the proto-germ line while the larger host cell provided energy for growth and reproduction. B) The mitochondria and chloroplasts provided gene products that could be used by the larger host cell for improved parasitization. C) The mitochondria and chloroplasts provided molecular energy in return for protection by the larger host cell. D) The mitochondria and chloroplasts produce toxins that the larger cell utilized to defend itself from other cells mutually increasing the defense of all those involved.
What is the evidence that the metamonads, which lack mitochondria, derive from ancestors that had mitochondria rather than from ancestors that were in lineages that never contained mitochondria?
Endosymbioses that lead to the evolution of euglenoids and, separately, the evolution of chlorarachniophytes were the result of the combining of: a. two ancestral nonphotosynthetic prokaryotes. b. two ancestral photosynthetic prokaryotes. c. a nonphotosynthetic eukaryote with a photosyntheticeukaryote. d. a photosynthetic prokaryote with a nonphotosyntheticeukaryote. e. mitochondria with an already established plastid.
How did the evolution of oxygen-releasing photosynthesis in cyanobacteria increase the likelihood that mitochondria would one day evolve?
According to the endosymbiotic theory of the origin of eukaryotic cells, how did chloroplasts originate? -by tertiary endosymbiosis -through secondary endosymbiosis -from the nuclear envelope folding outward and forming mitochondrial membranes -from infoldings of the plasma membrane, coupled with mutations of genes for oxygen-using metabolism -through primary endosymbiosis
The endosymbiotic hypothesis for the origin of chloroplasts from gram-negative prokaryotes is supported by all of the following lines of evidence except: the presence of enzymes for the light-dependent and the dark reactions of photosynthesis the presence of circular DNA resembling that of photosynthetic eubacteria the presence of mRNA, tRNA, and rRNA similar to that of the cyanobacteria their use of mitosis rather than binary fission during cell division the presence of 70s ribosomes, consisting of 30s and 50s ribosomal subunits
Which traits are shared by all eukaryotic cells, and what are the three major lines of evidence that mitochondria arose from endosymbiosis with proteobacteria?
What evidence supports the hypothesis that mitochondria preceded plastids in the evolution of Eukaryotes cells?
According to the endosymbiotic theory, why was it adaptive for the larger (host) cell to keep the engulfed cell alive, rather than digesting it as food? A. The host cell would have been poisoned if it had digested the engulfed cell. B. The host cell was able to survive anaerobic conditions with the engulfed cell alive. C. The engulfed cell provided the host cell with CO2 D. The engulfed cell provided the host cell with ATP. E. The engulfed cell allowed the host cell to metabolize glucose.
According to the endosymbiotic theory, protoeukaryotes did not have ribosomes until the endosymbiosis with mitochondria was established.
. The endosymbiotic hypothesis for the origin of mitochondria from gram-negative prokaryotes is supported by all of the following lines of evidence except: A. the presence of enzymes for the Krebs cycle, electron transport, and oxidative phosphorylation the presence of mRNA, tRNA, and rRNA similar to that of the a-proteobacteria the presence of 80s ribosomes, consisting of 40s and 60s ribosomal subunits the presence of circular DNA resembling that of aerobic proteobacteria their use of binary fission rather than mitosis during cell division