Concept explainers
a.
To determine: The bacterial group from which a chloroplast is likely to evolve.
Introduction: The two basic types of cells are eukaryotic and prokaryotic cells. Bacteria and archaea are considered as prokaryotes in terms of lacking membrane-bound organelles, internal membranous structures, and the cytoskeleton.
b.
To define: The term “metagenomics”.
Introduction: Prokaryotes have evolved approximately 3.5 billion years ago and extensively adapted to various structural and
To determine: The way by which metagenomics contributes to the prokaryotic phylogeny.
Introduction: The study of genetic materials recovered directly from the environmental samples is called metagenomics.
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Study Guide for Campbell Biology
- Multicellular organisms with a true nucleus, histone proteins, ester-linked fatty acids in their cellmembranes, opisthokont ancestry, and chitin cell walls, are most likely to be:A. members of kingdom ArchaeobacteriaB. members of kingdom EubacteriaC. members of kingdom AnimaliaD. members of kingdom PlantaeE. members of kingdom Fungarrow_forwardThe 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 subunitsarrow_forwardIn the early 1930s, G. F. Gause carried out a series of experiments using two species of ciliated protists (Paramecium), which are single-celled eukaryotic protozoans. The protists were cultured together and separately, with the bacteria being the single food source. The results are shown in the figure below. (a) Based on figure, identify and explain the interaction that is taking place between P. caudatum and P. aurelia. (b) Clam shrimp, a natural predator to P. caudatum, is introduced to the culture containing both P. caudatum and P. aurelia after 24 days. Predict the impact that the clam shrimp will have on the culture and the populations. Justify your prediction.arrow_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_forwardPlease, help: Question: Evolution of Prokaryote into the Eukaryote cell type. A. What are the significant the significant changes that are represented in the evolution of the prokaryote cell type into the eukaryote cell. B. Why are these changes (major differences) important in the process of evolution of more complex organisms?arrow_forwardWhat 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?arrow_forward
- 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 chloroplastsarrow_forward50) Some protists, formerly united as the ʺamitochondriateʺ clade, have recently been shown to be rather diverse. Some of them possess neither mitochondria nor mitochondrial genes (and have been classified as fungi). Others possess no mitochondria, but do have mitochondrial genes in their nuclear genome. Still others have modified mitochondria (viz. mitosomes or hydrogenosomes). Which statement(s) represent(s) consequences of these recent findings? 1. The amitochondriates do not comprise a true clade. 2. The ʺamitochondriate hypothesisʺ concerning the root of the eukaryotic tree has been strengthened. 3. Just as there is a diversity of cyanobacterial descendants among eukaryotes, so too is there a diversity of alpha-proteobacterial descendants among the eukaryotes. 4. If the amitochondriate organisms continued to be recognized as a taxon, this taxon would be polyphyletic. 5. Horizontal gene transfer involving mitochondrial genes has occurred in some amitochondriate organisms. A) 1 only…arrow_forwardIn studying Lokiarchaeota, researchers identified eukaryotic signature genes and used this information to better understand the relationship between archaeans and eukaryotes. Many other types of genetic analysis can be used that focus on certain types of genes. One example of this is multilocus sequence typing (MLST), which focuses on examining genes called housekeeping genes. Microbes encode both housekeeping and pathogenic genes in their genome. Drag the examples of genes to the correct bins to indicate whether they are housekeeping genes, pathogenic genes, or eukaryotic signature genes. Place the phrase describing a gene product in the correct bin. ► View Available Hint(s) peptidoglycan synthesis genes Housekeeping genes membrane remodeling genes cytoskeletal genes membrane lipid genes Pathogenic genes endotoxin genes Reset ribosomal genes exotoxin genes Eukaryotic signature genes Helparrow_forward
- Which traits are shared by all eukaryotic cells, and what are the three major lines of evidence that mitochondria arose from endosymbiosis with proteobacteria?arrow_forward. Which of the following prokaryotic kingdoms is characterized by the absence of a nucleus, the absence of histone proteins, the presence of fatty acids ester-linked to glycerol in their G-3-P cell membrane, and the presence of enzymes for constructing a peptidoglycan cell wall? kingdom Archaeobacteria kingdom Animalia kingdom Fungi kingdom Plantae kingdom Eubacteriaarrow_forwardIn the late 1960s (and since), Lynn Margulis (and others) provided considerable evidence for the endosymbiotic theory of the origin of various organelles in eukaryotic cells.What is the endosymbiotic theory? Which two eukaryotic organelles were proposed to have arisen as endosymbionts? What evidence did Margulis present to support each organelle as an endosymbiont?arrow_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning