Based on the emerging data, should the existing ‘3 Domains of Life – Archaea, Bacteria, Eukarya’ be formally revoked and replaced by only 2 Domains? What is the significance of the Last universal common ancestor (LUCA) in this matter?

Based on the emerging data, should the existing ‘3 Domains of Life – Archaea, Bacteria, Eukarya’ be formally revoked and replaced by only 2 Domains? What is the significance of the Last universal common ancestor (LUCA) in this matter?

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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Prokaryotic evolution

The term evolution means the gradual change or a transformation from a simple or primitive state to a complex or advanced state. Prokaryotic evolution is a concept that involves the evolution of the form and function of most primitive organisms (prokaryotes) through several stages and changes to form diverse life as a part of organic evolution.

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Based on the emerging data, should the existing ‘3 Domains of Life – Archaea, Bacteria, Eukarya’ be formally revoked and replaced by only 2 Domains?

What is the significance of the Last universal common ancestor (LUCA) in this matter?

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The TATA-binding protein (TBP) is thought to be necessary for transcription in all eukaryotic cell nuclei. Studies show that archaea, but not bacteria,have a protein structurally and functionally similar to TBP. What does this similarity suggest regarding the evolution of archaea, bacteria, and eukaryotes? How might knowledge of this similarity affect how systematists classify these organisms?
Based on the emerging data, should the existing ‘3 Domains of Life – Archaea, Bacteria, Eukarya’ be formally revoked and replaced by only 2 Domains? Provide 3 reasons.
How many possible different trees (branching pat-terns) can in theory be drawn to display the evolution ofbacteria, archaea, and eukaryotes, assuming that they allarose from a common ancestor?
Isoprene serves as a building block not only for the hydrocarbons observed in archaeal membranes but also for sterols, carotenoids, retinal, and quinones. Use any resources necessary to identify the function of these other isoprene-based molecules and to determine their distribution in nature. What does the use of isoprene to make this diverse array of molecules suggest about the nature of the last universal common ancestor (LUCA)?
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Which of the following is FALSE regarding phylogenetic trees? 1) The branch lengths on the tree are scaled to molecular (DNA) changes and/or time. 2)Phylogenetic trees have shown us that there is much more bacterial diversity compared to eukaryotes. 3) Phylogenetic trees show the evolutionary relatedness of different organisms. 4). The branch lengths on the tree depict abiotic and biotic factors affecting speciation.
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