CUSTOM BIOLOGY
19th Edition
ISBN: 9781323945490
Author: Urry
Publisher: Pearson Custom Publishing
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
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.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
1. How do members of Eukarya differ from the prokaryotic groups of Chp 26 (your text lists 4 major differences)? Do
these differences represent a greater success and superiority of eukaryotic over prokaryotic cells?
2. Examine Figure 27.1 from your text. How does this phylogenetic tree show that "Protists" are paraphyletic? Hint:
think about what the term "paraphyletic" means in your answer..
3. Describe at least two impacts that protists have on humans and two ecological importance's protists have on the
planet.
4. What is direct sequencing and how has it been used to discover new lineages in the eukaryotic group? Be specific!
5. What is the endosymbiosis theory and what are thought to have been the three main steps in the theory? What
are thought to have been the two main steps in the nucleus formation?
• Previous
Next
MacBook Pro
G Search or type URL
23
%24
&
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…
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?
Chapter 28 Solutions
CUSTOM BIOLOGY
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...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Redraw 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_forwardCompare the phylogenetic tree of protists with the secondary endosymbiosis theory which proposes how photosynthetic protists evolved. Are both reconcilable? Explain.arrow_forward
- Members 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_forwardEndosymbioses 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_forward
- What evidence supports the hypothesis that mitochondria preceded plastids in the evolution of Eukaryotes cells?arrow_forwardA) A major difference between eukaryotic cells and prokaryotic cells is that eukaryotic cells Group of answer choices exhibit little if any compartmentalization of function are generally smaller than prokaryotic cells have a large degree of internal organization lack organelles have little if any internal organization B) Which of the following statements about protists is false? Group of answer choices Some protists are mixotrophic Certain protists share a common ancestor with land plants Some protists are photosynthetic prokaryotes which are similar to the ancestral chloroplast Protists are a polyphyletic group of organisms that often bear little resemblance to each other Although most protists are unicellular, some protists are multicellular as wellarrow_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
- Molecular fossils further indicate the presence of ciliates and dinoflagellates in the emerging eukaryotic world and show that algae were expanding to become major photosynthesizers in the oceans. How can we explain this diversification?arrow_forwardDescribe 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_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Discovering the tree of life | California Academy of Sciences; Author: California Academy of Sciences;https://www.youtube.com/watch?v=AjvLQJ6PIiU;License: Standard Youtube License