Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 7.5, Problem 2R
Summary Introduction
To review:
The possible steps represented by Volvocine in the evolution of tissue formation and cell communication.
Introduction:
The cells communicate with each other to work effectively. This communication skill of cells has evolved over a long course. A simple multicellular organism such as Volvocine is used to represent cell aggregation and cell specialization.
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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
describe a scenario for the evolutionary origin of protist chloroplasts?
A)
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 well
Chapter 7 Solutions
Life: The Science of Biology
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- Identify two features of organelles that support theendosymbiotic theory of organelle evolution.arrow_forwardWhat is the evolutionary adaptation that separates protists from all land plants?arrow_forwardwhat are some themes in the structural and functional diversity of protists? Nutritional? reproductive?arrow_forward
- Except for the Plantae, what best describes the origin of chloroplasts in most other eukaryotes? Group of answer choices Chloroplasts evolved independently in different lineages Primary endosymbiosis An amoeboid protist engulfed another protist that had chloroplasts in its tissues Mitochondria were converted to perform photosynthetic functions Eukaryotes outside the Plantae don’t have chloroplastsarrow_forwardWhat are some of the criteria and tools biologists might use to assign the different types of protists to monophyletic groups?arrow_forwardWhat are the main differences and similarities among the major groups of algae? How are these groups related to each other evolutionarily?arrow_forward
- Compare the phylogenetic tree of protists with the secondary endosymbiosis theory which proposes how photosynthetic protists evolved. Are both reconcilable? Explain.arrow_forwardList three sources of evidence that support theendosymbiotic theory of organelle evolution.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_forward
- What traits link green algae and plants?arrow_forwardWhat evidence supports the hypothesis that mitochondria preceded plastids in the evolution of Eukaryotes cells?arrow_forwardCarotenoids in algae have evolved through primary and secondary endosymbiosis. provide a well-constructed phylogenetic tree to show where carotene, neoxanthin, zeaxanthin, violaxanthin, fucoxanthin, and lutein arose in the macrophytic, multicellular groups of algae. add descriptive and informative title to itarrow_forward
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