Chapter 28 Questions

Chapter 28 Questions - Ch 28 Multiple Choice Identify the...

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Ch 28 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Protists are alike in that all are a. multicellular. b. photosynthetic. c. marine. d. nonparasitic. e. eukaryotic. ____ 2. All of the following groups had taxonomic significance in the past, but only one is now considered to be a diverse clade. Which group is it? a. algae b. protist c. protozoa d. monera e. euglenozoa ____ 3. Which of the following statements concerning living phytoplanktonic organisms are true? 1. They are important members of communities surrounding deep-sea hydrothermal vents. 2. They are important primary producers in most aquatic food webs. 3. They are important in maintaining oxygen in Earth's seas and atmosphere. 4. They are most often found growing in the sediments of seas and oceans. 5. They can be so concentrated that they affect the color of seawater. a. 1 and 4 b. 1, 2, and 4 c. 2, 3, and 4 d. 2, 3, and 5 e. 3, 4, and 5 ____ 4. Biologists have discovered the kingdom Protista to be paraphyletic. Which of the following statements is true, and consistent with this conclusion? a. Various combinations of prokaryotic ancestors gave rise to different lineages of protists. b. Animals, plants, and fungi arose from different protistan ancestors. c. Multicellularity has evolved only once among the protists. d. Chloroplasts among various protists are similar to those found in prokaryotes. e. The protists arose from a common ancestor that was a parabasalid. ____ 5. The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the following? a. nuclei and chloroplasts b. mitochondria and chloroplasts c. cilia and mitochondria d. mitochondria and nuclei e. mitochondria and cilia ____ 6. According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate? a. from infoldings of the plasma membrane, coupled with mutations of genes for oxygen- using metabolism b. from engulfed, originally free-living prokaryotes c. by tertiary endosymbiosis
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d. from the nuclear envelope folding outward and forming mitochondrial membranes e. when a protoeukaryote engaged in a symbiotic relationship with a protobiont ____ 7. Which of the following statements is consistent with the hypothesis that certain eukaryotic organelles originated as prokaryotic endosymbionts? Such organelles a. are roughly the same size as bacteria. b. can be cultured on agar since they make all their own proteins. c. contain circular DNA molecules. d. have ribosomes that are similar to those of bacteria. e. A, C, and D ____ 8. Which process allows nucleomorphs to be first reduced, and then lost altogether, without the loss of any genetic information from the host cell that ultimately surrounds the nucleomorph? a.
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This note was uploaded on 12/13/2010 for the course ACT 101 taught by Professor Jenkins during the Spring '10 term at Alabama State University.

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Chapter 28 Questions - Ch 28 Multiple Choice Identify the...

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