Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 6.5CR
What does the endosymbiont theory propose us the origin for mitochondria and chloroplasts? Explain.
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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.
It has been suggested that chloroplasts, like mitochondria, evolved from independent living organisms. What features of the chloroplast suggest that this is true?
It has been suggested that chloroplasts, like mitochondria,evolved from living organisms. What features of the chloroplast suggest that this is true?
Chapter 6 Solutions
Campbell Biology
Ch. 6.1 - Prob. 1CCCh. 6.1 - Prob. 2CCCh. 6.2 - Briefly describe the structure and function of the...Ch. 6.2 - DRAW IT Draw a simplified elongated cell that...Ch. 6.3 - What role do ribosomes play in carrying out...Ch. 6.3 - Describe the molecular composition of nucleoli and...Ch. 6.3 - Prob. 3CCCh. 6.4 - Describe the structural and functional...Ch. 6.4 - Describe how transport vesicles integrate the...Ch. 6.4 - WHAT IF? Imagine a protein that functions in the...
Ch. 6.5 - Describe two characteristics shared by...Ch. 6.5 - Prob. 2CCCh. 6.5 - Prob. 3CCCh. 6.6 - Prob. 1CCCh. 6.6 - WHAT IF? Males afflicted with Kartagener's...Ch. 6.7 - In what way are the cells of plants and animals...Ch. 6.7 - Prob. 2CCCh. 6.7 - MAKE CONNECTIONS The polypeptide chain that makes...Ch. 6.8 - Prob. 1CCCh. 6 - Prob. 6.1CRCh. 6 - Explain how the compartmental organization of a...Ch. 6 - Describe the relationship between the nucleus and...Ch. 6 - Describe the key role played by transport vesicles...Ch. 6 - What does the endosymbiont theory propose us the...Ch. 6 - Describe the role of motor proteins inside the...Ch. 6 - Prob. 6.7CRCh. 6 - When a cell ingests a bacterium, what role does...Ch. 6 - Prob. 1TYUCh. 6 - Prob. 2TYUCh. 6 - Which of the following is present in a prokaryotic...Ch. 6 - Prob. 4TYUCh. 6 - Which cell would be best for studying lysosomes?...Ch. 6 - Prob. 6TYUCh. 6 - EVOLUTION CONNECTION (a) What cell structures best...Ch. 6 - SCIENTIFIC INQUIRY Imagine protein X, destined to...Ch. 6 - WRITE ABOUT A THEME: ORGANIZATION Considering some...Ch. 6 - SYNTHESIZE YOUR KNOWLEDGE The cells in this SEM...
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- What evidence supports the hypothesis that mitochondriapreceded plastids in the evolution of eukaryotic cells?arrow_forwardWhat evidence supports the hypothesis that mitochondria preceded plastids in the evolution of Eukaryotes cells?arrow_forwardBiologists think that endosymbiosis gave rise to mitochondriabefore plastids partly because(A) the products of photosynthesis could not be metabolizedwithout mitochondrial enzymes.(B) all eukaryotes have mitochondria (or their remnants),whereas many eukaryotes do not have plastids.(C) mitochondrial DNA is less similar to prokaryotic DNA thanis plastid DNA.(D) without mitochondrial CO2 production, photosynthesiscould not occur.arrow_forward
- Explain the endosymbiont hypothesis for the origin ofchloroplasts and mitochondria.arrow_forwardDescribe the features of mitochondria and chloroplasts that support the endosymbiotic theory.arrow_forwardA scientist discovered a new group of unicellular organisms that lack mitochondria but possess an organelle related to the endoplasmic reticulum and is involved in energy production. The scientist hypothesizes that this organelle might be a missing link in the evolution of mitochondria. A) Do you agree with this hypothesis? Explain. B) Based on the available evidence, what is the most likely hypothesis for the origin of mitochondria? Provide four pieces of evidence to support this theory and justify why they are valid.arrow_forward
- How did the evolution of oxygen-releasing photosynthesis in cyanobacteria increase the likelihood that mitochondria would one day evolve?arrow_forwardWhat is the evolutionary origin of chloroplasts?arrow_forwardWhat evidence supports the idea that the mitochondrion andchloroplast were once free-living members of the domainBacteria?arrow_forward
- The 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_forwardThe origin of the photosynthetic eukaryote took place when a ______ was engulfed by a later eukaryote with mitochondria. Later eukaryote with mitochondria b) early eukaryote with chitin c) early prokaryote with ribosomes d) later prokaryote with chloroplastsarrow_forwardHow can the hypothesis that asserts that chloroplasts as well as mitochondria were primitive prokaryotes that associated in mutualism with primitive anaerobic eukaryotic cells be corroborated?arrow_forward
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