EBK BIOLOGY
5th Edition
ISBN: 9780133954425
Author: Maier
Publisher: YUZU
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Chapter 13, Problem 3AAATB
Support for the endosymbiotic theory for the evolution of eukaryotic groups includes that chloroplasts and mitochondria are surrounded by two membranes, one that derives presumably from the bacterial symbiont and one that derives from the host cell’s vacuole that originally surrounded it. Interestingly, some algal phyla, for instance the Euglenophyta, contain chloroplasts composed of three membranes. Given your understanding of endosymbiosis, how do you think this extra membrane may have evolved?
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In lecture, we discussed the endosymbiont theory that describes the evolutionary
origins of mitochondria and chloroplast. A few scientists think that peroxisomes also
have an endosymbiotic evolutionary origin, although most scientists disagree with
this hypothesis. Which of the following hypothetical discoveries would provide
support for the hypothesis that peroxisomes evolved from bacteria?
Discovering that eukaryotic cells cannot live without peroxisomes.
All of these hypothetical discoveries would provide support for the hypothesis
that peroxisomes have an endosymbiotic evolutionary origin.
Identifying the presence of DNA within peroxisomes.
Determining that the majority of proteins in peroxisomes have eukaryotic origin.
1. 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.
a) Describe some characteristics and differences between prokaryotic and eukaryotic cells.b) How do the three domains of life differ from one another?c) Two of the organelles in eukaryotes, the mitochondrion and the chloroplast are believed to haveoriginated through a process of symbiosis. Discuss some of the theories of the origins ofmitochondria and chloroplasts
Chapter 13 Solutions
EBK BIOLOGY
Ch. 13 - How many different species have been identified by...Ch. 13 - Plants experienced an adaptive radiation after the...Ch. 13 - How are hypotheses about the evolutionary...Ch. 13 - Which of the following kingdoms or domains is a...Ch. 13 - Comparisons of ribosomal RNA among many different...Ch. 13 - On examining cells under a microscope, you notice...Ch. 13 - The mitochondria in a eukaryotic cell ___________....Ch. 13 - Prob. 8LTBCh. 13 - Prob. 9LTBCh. 13 - Phylogenies are created based on the principle...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Describe the features of mitochondria and chloroplasts that support the endosymbiotic theory.arrow_forwardExplain why evolutionary biologists are interested in choanoflagellates, green algae, and organisms with mitochondria whose genomes resemble those of bacteriaarrow_forwardWhat evidence supports the hypothesis that mitochondria preceded plastids in the evolution of Eukaryotes cells?arrow_forward
- The endosymbiont theory states that mitochondria andchloroplasts evolved from symbiotic relationshipsestablished between bacteria-like cells and theprecursors of eukaryotic cells that engulfed them on what basisarrow_forwardDoes the following phylogenetic tree provide evidence to support or refute the endosymbiosis hypothesis? Briefly explain your choice (1-2 sentences) Bacteria a-Proteobacteria Mitochondria Archaea Eukarya Excavata Discicristata Alveolata Stramenopila Rhizaria Plantae Opisthokonta Amoebozoaarrow_forwardEvidence indicating the chloroplasts were originally free-living prokaryotes that subsequently evolved a symbiotic relationship with a eukaryotic host includes all of the following except: Ability of chloroplasts to synthesize all their own proteins Presence of circular DNA in chloroplasts and in free-living prokaryotes Similarities of rRNA sequences between chloroplasts and free-living prokaryotes Similarities of structures between chloroplasts and some contemporary free-living prokaryotes Carrow_forward
- 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.arrow_forwardThe theory endosymbiosis is important in understanding how mitochondria and eukaryotic cells may have evolved.what structure is central to the concept of endosymbiosisarrow_forwardAn endosymbiont is any organism that lives within the body or cells of another organism. Each would have performed mutually benefiting functions from their symbirie relationship. Why are the mitochondria considered an endosybiont in an eukaryotic cell ? They have two membranes have DNA sequences that indicate origin from the alpha- prroteobacteria has a means for using oxygen and create ATP can break down glucose for energy O They contain hydrolytic enzymesarrow_forward
- Use this diagram of a Chlamydomonas cell for the following question. M. CY CL is chloroplast, CY is cytoplasm, M is mitochondrion, N is nucleus. Which of the following locations would be the site of translation of genes involved in the process of cellular respiration? 00arrow_forwardThe theory of the endosymbiotic origin of mitochondria and chloroplasts was first proposed by the biologist Lynn Which of the following statements provides support for the theory of endosymbiosis? 1. All the genes found in chloroplasts are homologous to genes found in the nucleus of eukaryotic cell. 2. Mitochondria contain their own ribosomes. 3. Proteins need a targeting sequence to be imported into a chloroplast. 4. Mitochondria can generate a proton gradient and harness it to synthesize ATP. O A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correct.arrow_forward5)Which of the following observations constitutes evidence that mitochondria evolved before chloroplasts? Mitochondria are aerobic. Chloroplasts are photosynthetic. Aerobic bacteria evolved before photosynthetic bacteria (cyanobacteria). Some protists have separately evolved their own plastids (chloroplast-like structures) through endosymbiosis of cyanobacteria, or even through endosymbiosis of photosynthetic protists. All Eukaryotes have mitochondria; only a subset of Eukaryotes have chloroplasts.arrow_forward
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