Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Question
Chapter 26.2, Problem 2C
Summary Introduction
To determine: The kinds of scientific evidence that support the hypothesis that protists are a paraphyletic group.
Introduction: Paraphyletic taxon is defined by “shared ancestral characters” and includes a common ancestor but not all its descendants. They share only a few evolutionary relationships.
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What kinds of scientific evidence support the hypothesis that protists are a paraphyletic group?
Why is 'protists' considered a polyphyletic grouping? Why do biologists still use it?
Protista is no longer accepted as a Kingdom because the organisms classified as protists show
varying degrees of genetic relatedness. Protista is a paraphyletic grouping that historically
encompassed organisms that did not fit into other classification groups.
Select one:
O True
O False
Chapter 26 Solutions
Biology (MindTap Course List)
Ch. 26.1 - Discuss in general terms the diversity inherent in...Ch. 26.1 - How do protists vary in their means of obtaining...Ch. 26.1 - What are some of the ways protists interact with...Ch. 26.2 - Discuss the hypothesis of serial endosymbiosis and...Ch. 26.2 - Prob. 3LOCh. 26.2 - How does serial endosymbiosis explain the origin...Ch. 26.2 - Prob. 2CCh. 26.3 - Prob. 4LOCh. 26.3 - What cell organelle is atypical in excavates?Ch. 26.3 - Give an example of a human disease caused by each...
Ch. 26.4 - Prob. 5LOCh. 26.4 - Prob. 6LOCh. 26.4 - Prob. 7LOCh. 26.4 - Prob. 1CCh. 26.4 - Prob. 2CCh. 26.4 - Which water mold has influenced human history?...Ch. 26.4 - What is the ecological significance of the...Ch. 26.5 - Describe the forams and actinopods, and explain...Ch. 26.5 - Prob. 1CCh. 26.6 - Prob. 9LOCh. 26.6 - Prob. 1CCh. 26.7 - Prob. 10LOCh. 26.7 - What features distinguish the amoebozoa from the...Ch. 26.7 - Prob. 2CCh. 26 - Test Your Understanding 1. Which of the following...Ch. 26 - Molecular evidence supports the view that all...Ch. 26 - Prob. 3TYUCh. 26 - Prob. 4TYUCh. 26 - Prob. 5TYUCh. 26 - Prob. 6TYUCh. 26 - Prob. 7TYUCh. 26 - Prob. 8TYUCh. 26 - Kelps are _______________ with multicellular...Ch. 26 - Prob. 10TYUCh. 26 - Prob. 11TYUCh. 26 - Prob. 12TYUCh. 26 - EVOLUTION LINK Why are the protists considered...Ch. 26 - Prob. 14TYUCh. 26 - Prob. 15TYU
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- Compare the phylogenetic tree of protists with the secondary endosymbiosis theory which proposes how photosynthetic protists evolved. Are both reconcilable? Explain.arrow_forwardWhat is the evolutionary adaptation that separates protists from all land plants?arrow_forwardModern taxonomic treatments rely heavily on phylogenetic data to classify organisms. In the past, taxonomists often used a morphological species concept, in which species were defined based on similarities in growth form. Give an example of how a morphological species concept would group a set of protists differently from how a phylogenetic species concept would.arrow_forward
- Give three examples of protists for which the classifications haverecently changed. In each case, what was the justification for the oldcategory, and what is the justification for the change?arrow_forwardWhat do biologists mean when they say that sex and reproduction are uncoupled in most protists?arrow_forwardDraw a simple cladogram illustrating the relationships among the following: Common ancestor of all organisms, domain Eukarya, domain Bacteria, domain Archaea. To which domain do the organisms informally known as protists belong? To which domain do you belong?arrow_forward
- How are forams useful for researchers to study changes in ocean temperature over time? What are mixotrophs? What is endosymbiosis and why is it consider to be the source of eukaryotic diversity? Why are we confident this only happens once? What is primary and secondary endosymbiosis? Was there another endosymbiotic event that led to a third lineage? What group of organisms possesses a structure that might suggest this possibility and what is the structure? Why is the structure question different from the ancestor of other plastids? What are diatom blooms and why are they of particular interest to climate change scientists?arrow_forwardWhat is endosymbiosis and why is it considered to be the source of eukaryotic diversity? Why are we confident this only happened once? What is primary and secondary endosymbiosis? Was there another endosymbiotic event that led to a third lineage? What group of organisms possesses a structure that might suggest this possibility and what is the structure? Why is the structure in question different from the ancestor of other plastids?arrow_forwardIf you were to create an evolutionary tree in which amoebas were included within the kingdom of organisms to which they were the most closely related (rather than with protists, where they are currently placed), where would you put them?arrow_forward
- Which group of protists are scientists most likely to find as fossils? Which groups are least likely to be fossilized? Explain your reasoning.arrow_forwardCertain protists species cause human disease that are difficult to treat and are often deadly. How does the evolutionary relatedness of humans and protists explain the difficultly of treating a person infected with a pathogenic protist?arrow_forwardWe discussed two theories of the evolution of multicellularity in the animals, the Colonial Theory and the Syncytial Theory. For each of the two theories, give a brief summary of the theory and describe the characteristics you would expect to find in the protist ancestor proposed by each theory.arrow_forward
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