Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
Chapter 28.2, Problem 2CC
WHAT IF? Ø DNA sequence data for a diplomonad, a euglenid, a plant, and an unidentified protist suggest that the unidentified species is most dosely related to the diplomonad. Further studies reveal that the unknown species has fully functional mitochondria. Based on these data, at what point on the phylogenetic tree in Figure 28.2 did the mystery protist's lineage probably diverge from other eukaryote lineages? Explain.
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Is protist dna in a nucleus unicellular or multicellular?According to the phylogeny presented in this chapter which protists are in the same eukaryotic supergroup as plants a) green algae b) dinoflagellates c) red algaed both a and c in a lifecycle with alternation of generations multicellular haploid forms alternate with a unicellular haploid forms b unicellular diploid formsc multicellular haploid forms d) multicellular diploid forms
50) 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…
Chapter 28 Solutions
Campbell Biology (10th Edition)
Ch. 28.1 - Cite at least four examples of structural and...Ch. 28.1 - Summarize the role of endosymbiosis in eukaryotic...Ch. 28.1 - Prob. 3CCCh. 28.2 - Why do some biologists describe the mitochondria...Ch. 28.2 - WHAT IF? DNA sequence data for a diplomonad, a...Ch. 28.3 - Explain why forams have such a well-preserved...Ch. 28.3 - WHAT IF? Would you expect the plastid DNA of...Ch. 28.3 - Prob. 3CCCh. 28.3 - Prob. 4CCCh. 28.4 - Contrast red algae and brown algae.
Ch. 28.4 - Why is it accurate to say that Ulva is truly...Ch. 28.4 - Prob. 3CCCh. 28.5 - Contrast the pseudopodia of amoebozoans and...Ch. 28.5 - Prob. 2CCCh. 28.5 - Prob. 3CCCh. 28.6 - Justify the claim that photosynthetic protists are...Ch. 28.6 - Prob. 2CCCh. 28.6 - WHAT IF? High water temperatures and pollution...Ch. 28.6 - MAKE CONNECTIONS The bacterium Wolbachia is a...Ch. 28 - Describe similarities and differences between...Ch. 28 - What evidence indicates that the excavates form a...Ch. 28 - Prob. 28.3CRCh. 28 - On what basis do systematists place plants in the...Ch. 28 - Describe a key feature for each of the main...Ch. 28 - Prob. 28.6CRCh. 28 - Plastids that are Surrounded by more than two...Ch. 28 - Biologists think that endosymbiosis gave rise to...Ch. 28 - Prob. 3TYUCh. 28 - According to the phylogeny presented in this...Ch. 28 - In a life cycle with alternation of generations,...Ch. 28 - Based on the phylogenetic tree in Figure 28.2,...Ch. 28 - Prob. 7TYUCh. 28 - SCIENTIFIC INQUIRY Applying the If then logic of...Ch. 28 - WRITE ABOUT A THEME: INTERACTIONS Organisms...Ch. 28 - SYNTHESIZE YOUR KNOWLEDGE This micrograph show's a...
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- Eukaryotic cells can be detected at latest mid-way through the Proterozoic, and multicellular eukaryotes not long after – but there is a curious lag before the radiation of multicellular eukaryotic groups. We discussed two possible reasons for this. Explain both. Why might an early arrival of lichens on land explain aspects of both of those possibilities?arrow_forwardRedraw the phylogeny of eukaryotes, expanded to show different members (e.g. dinoflagellates, diatoms) of the supergroups as necessary and indicate the location of the primary endosymbioses for mitochondria and chlorophyll on the phylogeny. Indicate the location of three secondary endosymbioses leading to chloroplasts and one location showing the loss of mitochondria on the same phylogeny.arrow_forwardAlgae are autotrophs and can have photosynthesis, however, evolutionary evidence suggests that plants shared a common ancestor with only green algae and are closest relatives of Charophytes. What evidences support this statement? How an algal cell is different from fungal cells, even if both are eukaryotes? Why slime mold is a protist not a fungus even if it does not have chloroplast?arrow_forward
- Which of the following is considered a synapomophy of the Kingdom Disciristatae? * It exhibits the tubular cristae Presence of a spiral or crystalline rod structure inside each of their flagella some taxa possess the excavate feeding groove the presence of a kinetosome at the base of a flagellum Which evolutionary novelty in the origin of eukaryotes paved the way for endosymbiosis to occur. * The evolution of digestive vesicles The formation of endomembrane system The appearance of a cytoskeleton. the formation of a nuclear membranearrow_forwarda. Phylogenetic relationships based on chloroplast genes Brown algae Diatoms Most photosynthetic dinoflagellates Cryptophyte algae Red algae Red algae Green algae Euglenids Green algae Chlorarachniophyte algae Green algae Green algae Green algae Green algae Land plants Glaucocystophytes Cyanobacteria b. Phylogenetic relationships based on nuclear genes Opisthokonts Amoebozoans Glaucocystophytes Red algae Green algae (including land plants) Cryptophyte algae 140000 Diatoms Brown algae Dinoflagellates Chlorarachniophyte algae Chloroplast genes relate brown algae, diatoms, most dinoflagellates, and cryptophyte algae to red algae, which is different from the relationships based on nuclear genes shown in part b. -Excavates Chloroplast genes relate euglenids and chlorarachniophyte algae to green algae, which is different from the relationships based on nuclear genes shown in part b. Chloroplasts form a monophyletic group nested within cyanobacteria, providing strong evidence for the…arrow_forwardMembers of the kingdom Protista differ from members ofthe kingdom Monera mainly due to the presence of:(a) RNA(b) Ribosomes(c) Cell wall(d) DNA(e) Membrane-bound nucleusarrow_forward
- Endosymbioses that lead to the evolution of euglenoids and, separately, the evolution of chlorarachniophytes were the result of the combining of: a. two ancestral nonphotosynthetic prokaryotes. b. two ancestral photosynthetic prokaryotes. c. a nonphotosynthetic eukaryote with a photosyntheticeukaryote. d. a photosynthetic prokaryote with a nonphotosyntheticeukaryote. e. mitochondria with an already established plastid.arrow_forwardPlease briefly describe the idea of endosymbiosis and its role in protist evolution-relate to the idea of function of the group.arrow_forwardAccording to the endosymbiotic theory of the origin of eukaryotic cells, how did chloroplasts originate? -by tertiary endosymbiosis -through secondary endosymbiosis -from the nuclear envelope folding outward and forming mitochondrial membranes -from infoldings of the plasma membrane, coupled with mutations of genes for oxygen-using metabolism -through primary endosymbiosisarrow_forward
- Describe the morphology of oomycetes. Which protists are known for their cytoplasmic streaming movement? Which protists occasionally resemble tiny snails? What are the shells made of? Which group of protists have elaborate exteriors of glassy silica and are very common in the fossil record? What supergroup do land plants share a common ancestor with? What protists are common in tropical waters and are generally called “seaweeds?” Which of the algaes are the furthest living relatives to land plants? Which algaes are the closest living relatives to land plants? Which protists move using tube-like pseudopodia? Which protist group exhibits similarities to fungi as a result of convergent evolution? Which protist group takes on a slug form when nutrients are hard to come by? What protist group do animals share a common ancestor with? What are the choanoflagellates are believed to resemble? Which group contains at least one type of human parasite? Ecology of…arrow_forward1. How is designated the ancestral protist lineage that gives origin to the metazoans? 2. Layout that protist lineage (inform the names of the structures) 3. Wich big philo of metazoa is most related to this protist lineage? 4. What is the main sinapomorphy of this meathozary group? 5. How can the relationship be morphologically proven to the ancestral protist lineage? 6. The feeding of the basal metazoan has characteristics considered plesiomorphic. Indicate the food habit and digestion process of the basal metazoan (I'm sorry, i don't speak english very well)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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