Domanda del libro di testo
Consider the endosymbiosis theory for the origin of the mitochondrion. How did each endosymbiotic partner benefit from the relationship?
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Ch. 27 - Diversification of Eukaryotes
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Capitolo 27, Problema 7
Why was finding a close relationship between mitochondrial DNA and bacterial DNA considered particularly strong evidence in favor of the endosymbiosis theory?
Guida verificata passo dopo passo1
Understand the endosymbiosis theory: This theory suggests that certain organelles, like mitochondria, originated as free-living bacteria that were engulfed by ancestral eukaryotic cells, forming a symbiotic relationship.
Explore the characteristics of mitochondrial DNA: Mitochondrial DNA is circular and resembles bacterial DNA, which is distinct from the linear DNA found in the nucleus of eukaryotic cells.
Examine the implications of DNA similarity: The similarity between mitochondrial DNA and bacterial DNA supports the idea that mitochondria evolved from bacteria, as they share structural and genetic features.
Consider the evolutionary significance: The presence of bacterial-like DNA in mitochondria suggests a common ancestry, reinforcing the concept that mitochondria were once independent organisms that became integrated into eukaryotic cells.
Evaluate the evidence for endosymbiosis: The close relationship between mitochondrial DNA and bacterial DNA provides strong molecular evidence for the endosymbiosis theory, as it indicates a historical symbiotic event leading to the evolution of complex eukaryotic cells.
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Mitochondrial DNA
Mitochondrial DNA (mtDNA) is the genetic material found in mitochondria, the energy-producing organelles within eukaryotic cells. Unlike nuclear DNA, mtDNA is circular and resembles bacterial DNA, supporting the idea that mitochondria originated from free-living bacteria. This similarity is crucial for understanding the evolutionary link proposed by the endosymbiosis theory.
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04:45
Mitochondria Structure
Bacterial DNA
Bacterial DNA is typically circular and not enclosed within a nucleus, differing from the linear DNA found in eukaryotic cells. The structural and genetic similarities between bacterial DNA and mitochondrial DNA provide evidence for the endosymbiosis theory, suggesting that mitochondria evolved from an ancestral symbiotic relationship with bacteria.
Video consigliato:
03:06Bacterial Transformation
Endosymbiosis Theory
The endosymbiosis theory posits that certain organelles, like mitochondria and chloroplasts, originated as free-living bacteria that were engulfed by ancestral eukaryotic cells. Over time, these bacteria formed a symbiotic relationship, becoming integral parts of the host cell. The genetic similarities between mitochondrial and bacterial DNA strongly support this theory, indicating a shared evolutionary history.
Video consigliato:
06:58Endosymbiotic Theory
Pratica correlata
Domanda del libro di testo
Consider the following:
Plasmodium has an unusual organelle called an apicoplast. Recent research has shown that apicoplasts are derived from chloroplasts via secondary endosymbiosis and have a large number of genes related to chloroplast DNA.
Glyphosate is one of the most widely used herbicides. It works by poisoning an enzyme located in chloroplasts.
Biologists are testing the hypothesis that glyphosate could be used as an antimalarial drug in humans.
How are these observations connected?
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Domanda del libro di testo
Suppose a friend says that we don't need to worry about the rising temperatures associated with global climate change. She claims that increased temperatures will make planktonic algae grow faster and that carbon dioxide (CO2) will be removed from the atmosphere faster. According to her, this carbon will be buried at the bottom of the ocean in calcium carbonate shells. As a result, the amount of carbon dioxide in the atmosphere will decrease and global warming will decline. Comment.
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Domanda del libro di testo
The text claims that the evolutionary history of protists can be understood as a series of morphological innovations that established seven distinct lineages, each of which subsequently diversified based on innovative ways of feeding, moving, and reproducing. Explain how the Alveolata support this claim.
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Domanda del libro di testo
How can dinoflagellates be harmful to humans? a. They are transmitted by mosquitoes and cause malaria. b. They produce toxins that can be absorbed by clams and other shellfish which, when eaten by people, can lead to paralytic shellfish poisoning. c. They cause amoebic dysentery which leads to severe diarrhea and dehydration. d. They are transmitted by tsetse flies and cause 'sleeping sickness.'
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Domanda del libro di testo
Explain the logic behind the claim that the nuclear envelope is a synapomorphy that defines eukaryotes as a monophyletic group.
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